nsr_device(5)                                                         nsr_device(5)

NAME

       nsr_device - NetWorker resource type "NSR device"


SYNOPSIS

       type: NSR device


DESCRIPTION

       Each storage device used by a NetWorker server is described by a single
       resource of type NSR device.  See nsr_resource(5)  for  information  on
       NetWorker resources.  To edit the NSR device resources run:
              nsradmin -c "type:NSR device"
       Be  sure to include quotation marks and to insert a space between "NSR"
       and "device".  See nsradmin(1) for information on using  the  NetWorker
       administration program.  The mounting and unmounting of individual vol-
       umes (tapes or disks) is performed using the  nsrmm(8),  nsrjb(8),
       commands and NetWorker Management Console.


ATTRIBUTES

       The following attributes are defined for resource type NSR device.  The
       information in parentheses  describes  how  the  attribute  values  are
       accessed.   Read-only  indicates that the value cannot be changed by an
       administrator.  Read/write indicates a value that can be set as well as
       read.  Hidden indicates a hidden attribute of interest only to programs
       or experts.  These attributes can only be seen when the  hidden  option
       is  turned on in nsradmin(8). Static attributes change values  rarely,
       if  ever.   Dynamic attributes have values that change rapidly.
       For example, an attribute marked (read-only,  static)  has  a
       value that is set when the attribute is created and never changes.

       name      (read-only, static)
              This attribute specifies the path name of the device.  Only non-
              rewinding tape devices are supported.  For systems that  support
              "Berkeley style" tape positioning, use the BSD tape device name.
              The name given to Optical disks is typically the name  given  to
              the "c" partition of the raw device.
              A logical device type has been defined to facilitate interaction
              with external media management services.  When interacting  with
              external  media  management  services,  the  device  name may be
              determined by the media management service associated  with  the
              device  where  a volume is loaded. The logical device is used to
              define a  NetWorker  device  resource.   The  number  of  device
              resources  that  can  exist  is limited by the number of volumes
              managed by the service that NetWorker may access simultaneously.
              The  name  given  to a logical device is not related to any spe-
              cific device, but is required  to  be  a  unique  name  for  the
              device.  For logical devices, both the media type and the family
              are set to logical.  The name, type, and family  are  determined
              after  the  media  management service has loaded a volume into a
              device in response to a request made by  NetWorker.   The  name,
              type,  and  family  of  the actual device are then stored in the
              attributes logical  name,  logical  type,  and  logical  family,
              respectively.   The  association  between the logical device and
              the actual device only exists when the volume is loaded into the
              device and allocated for use by NetWorker.
              Specify UNC (\\<server-name>\<share-point-name>) path when  cre-
              ating  an	 adv_file  device  of  a network filesystem on Windows
              storage node.
              When defining a remote device on a  storage  node,  include  the
              prefix  "rd=hostname:",  in the path name; where hostname is the
              system to which the device is  directly  attached	 (the  storage
              node).  For more information, see nsr_storage_node(5).
              Example: name: /dev/rmt/0hbn;

       comment        (read/write)
              This attribute is provided for the  administrator  to  keep  any
              explanatory  remarks  or  supplementary  information  about  the
              device.

       description    (read/write)
              This attribute is used to store a brief  description  about  the
              device.  The description is used to help administrators identify
              the device, and it can be in any format.
              Example: description: DLT8000 tape drive in Engineering Lab rack
              #2;

       message   (read-only, dynamic, hidden)
              This attribute specifies the last message received from the Net-
              Worker server  regarding  this  device.   The  values  for  this
              attribute may include information on the progress or rate of the
              operation.
              Example:  message:  "Tape  full,  mount   volume   mars.017   on
              /dev/nrst8";

       event id  (read-only, dynamic, hidden)
              This attribute specifies the unique tag for the alerts or  noti-
              fications generated due to device ordering issues.
              Example:  event id: " Potential device ordering issue
              : /dev/rmt/2cbn";

       volume name    (read-only, dynamic, hidden)
              This  attribute  monitors the mounting and unmounting of volumes
              for a device. When a volume is mounted, the value is the  volume
              name, otherwise there is no value.
              Example: volume name: mars.017;

       media family   (read-only, static, hidden)
              This  attribute  describes the class of storage media, as deter-
              mined from the media type. The only legal  values  are:  tape  -
              tape  storage device; disk - disk storage device; logical - used
              when interacting with an external media management service.
              Example: media family: tape;

       media type     (read-only, static)
              This attribute indicates the type of media a device  uses.   The
              media  type  varies  depending  on the operating system/platform
              (See the online NetWorker Hardware Compatibility Guide, which is
              referenced  in  the NetWorker Administration Guide in the Device
              and Media Management chapter, for a comprehensive list of  media
              types  supported  on  your  platform.).  Potential values, their
              meaning, and default capacities are:
              4mm - 4mm digital audio tape (1 GB); 8mm - 8mm video tape (2
              GB); 8mm 5GB - 8mm video tape (5 GB); adv_file - advanced file
              type device, standard UNIX file system is supported; dlt - digi-
              tal linear tape cartridge (10 GB); vhs - VHS data grade video
              tape (14 GB); 3480 - high-speed cartridge tape (200 MB); qic -
              quarter inch data cartridge (150 MB); himt - half inch magnetic
              tape (100 MB); tk50 - DEC TK50 cartridge tape (94 MB); tk70 -
              DEC TK70 cartridge tape (296 MB); optical - optical disks, Write
              Once Read Many (WORM), Erasable Optical Disks (EOD), or standard
              UNIX files are supported; file - file type device, standard UNIX
              file system is supported; logical - used when interacting with
              an external media management service.
              Example: media type: 8mm 5GB;

       enabled   (read-write)
              This attribute indicates whether a device is available for use.
              The value for this attribute is either Yes, No or Service.  If
              the value is set to Yes the device is fully operational and can
              be used for all operations.  This is the default setting for a
              device.  If the value is set to No, the device is disabled and
              may not be used. A device cannot be set to No if a device is
              mounted, since it would cause the mounted volume to become inac-
              cessible to NetWorker until the device is set back to Yes. If
              the value is set to Service, the device may not be mounted for
              save or recover operations.  This state is used to reserve a
              device for maintenance. The device can be used for administra-
              tive purposes such as volume verification, labeling or invento-
              ries if the device is selected using the -f option.  A device
              set in Service mode can not be used for save or recover opera-
              tions. If the device is set to Service while the device is in
              use, all current sessions will be allowed to complete normally,
              but no new sessions will be assigned to the device.  If the
              device is a jukebox device, the device will be unloaded after
              the sessions have completed.
              Example: enabled: yes;

       shared devices (read-write, hidden)
              This attribute enables, disables or service modes all devices
              that have the same value for their hardware id attribute, and so
              are sharing the same physical drive.  Possible values are enable
              all, disable all, service all or done.  After the value is set
              to either enable all, disable all or service all and the action
              is performed, the value will be reset to done.  The action will
              enable, disable or service mode as many devices as it can,
              regardless of any error conditions.  For example, it is not pos-
              sible to disable a device that has a mounted volume.  So when
              this attribute is set to disable all, as many devices as possi-
              ble will be disabled, excluding those with mounted volumes.  For
              such cases, an error message will be logged.
              Example: shared devices: done;

       write enabled  (read/write, dynamic, hidden)
              This attribute indicates whether writing to the current volume
              is allowed.  The value for this attribute may be set to yes or
              no.  This value can only be set when a volume is not mounted.
              Example: write enabled: no;

       read only (read-write)
              This attribute indicates whether a device is reserved for read-
              only operations, such as recover or retrieve. The value for this
              attribute can be either yes or no.  If the value is set to yes,
              only read operations are permitted on the device.  This value
              cannot be changed if a volume is mounted.
              Example: read-only: yes;

       target sessions               (read/write)
              This attribute indicates the target number of sessions that will
              write to a device.  When all devices on a host have the same
              value for this attribute, sessions are assigned to a device,
              until the device's target sessions is reached; then sessions are
              assigned to the next device on the host.  Once all devices have
              reached their target sessions, new sessions are assigned equally
              across all devices.
              When this attribute has different values for devices on a host,
              and the nsrmmd(8) has not yet been assigned to a device, then
              sessions are assigned to an nsrmmd(8) based on the lowest
              attribute value among the host's devices.  Once the nsrmmd(8) is
              assigned to a device, the target sessions value for the assigned
              device is used.
              Use higher values to multiplex more clients onto each tape.
              This attribute is not a maximum number for a device, but is used
              for load-balancing.
              Example: target sessions: 3;

       max sessions                    (read/write)
              This attribute indicates the maximum number of sessions that
              will write to a device. When all devices have reached their tar-
              get sessions, new sessions are assigned across all devices. For
              those devices where the attribute max sessi ons is set not more
              than the specified number of sessions is assigned to the device.
              If the number is reached the device is omitted for new sessions.
              This attribute is used to avoid overlaod situation of a nsrmmd
              process and to allow to optimize recover performanc (with high
              multiplex factor the recover performance may decrease).
              Example: max sessions: 8;

       volume label   (read/write, dynamic, hidden)
              This attribute is set by the Verify label operation and can be
              performed before the Label operation.  If this attribute is
              blank during the labeling process, then the volume's current
              label is reused.

       volume default capacity  (read/write, static, hidden)
              This attribute is used by the Label operation when the volume
              current capacity attribute is blank.  To override the volume
              default capacity associated with the media type, you must enter
              a specific value, such as 1 or greater.  The value of this
              attribute must end with K, M, or G, where K represents kilo-
              bytes, M represents megabytes, and G represents gigabytes.  The
              actual capacity written to the volume may be slightly lesser or
              greater than the value specified.
              This hidden attribute can be modified by a user, and can be used
              to override default sizes when using devices (and/or tapes) with
              different capacities than the defaults.
              Example: To override the default capacity of a tape drive to 10
              Gb for all future volume label operations, set the value as fol-
              lows:
              volume default capacity: 10G;

       volume current capacity  (read/write, dynamic, hidden)
              If the attribute's value is non-blank, it determines the capac-
              ity of a volume during the Label operation.  Its format is the
              same as volume default capacity.
              Example: volume current capacity: 5G;

       volume expiration   (read/write, dynamic, hidden)
              This attribute is set by the Verify label operation and can also
              be used by the Label operation.  The value for this attribute is
              specified in nsr_getdate(3) format.  A blank value causes the
              default expiration to be used during labeling.
              Example: volume expiration: next year;

       volume pool    (read/write, hidden)
              This attribute indicates the pool that a mounted volume belongs
              to.  This attribute can be set right after a device has been
              created and prior to a volume has been labeled to specify or
              display the default pool selection for the Label operation.  If
              this attribute is set during a Label or Label without mount
              operation, this value will indicate the pool a volume is being
              assigned to.  In order to change the volume pool assignment,
              Label operation must be performed by specifying a different
              pool.  Manual updates to this attribute in Devices resource has
              no effect on the pool assignment.  See nsr_pool(5) for more
              information on volume pools.
              Example: volume pool: myPool;

       volume flags   (read/write, hidden)
              This attribute displays the new flags for the volume being oper-
              ated on.  This attribute is used during "Label" or "Label with-
              out mount" operations.

       volume operation    (read/write, dynamic, hidden)
              The volume operation attribute manipulates the media (volume)
              currently located inside the device.  This attribute can be set
              to one of the following values: Unmount, Mount, Verify label,
              Verify write time, Label, Label without mount, Eject, or Monitor
              device.  Each of these operations may require parameters to be
              set.
              When the value is Unmount, NetWorker releases the device.  The
              Unmount operation is asynchronous.
              tion, and volume write time are set. The Verify write time oper-
              ation is synchronous, and therefore the operation may take a
              long time to complete.
              When the value is Label or Label without mount, the volume
              receives a new label as determined by the attributes below.
              When the value is Label, the volume is then mounted.  These
              operations are asynchronous.
              When the value is Eject, NetWorker ejects the volume from the
              device.  The Eject operation is asynchronous.
              When the value is Monitor device and the device is idle (no vol-
              ume loaded into the device), NetWorker will periodically check
              the device to determine whether a volume has been loaded into
              the device.  When a volume containing a readable NetWorker label
              is loaded, the volume is placed into the NetWorker media
              database. The volume can then be written to by NetWorker if the
              volume is mounted with write permissions turned on; otherwise,
              the volume is mounted as read-only, and cannot be written to by
              NetWorker.  When a volume without a readable NetWorker label is
              loaded into the device, the device's unlabeled volume loaded
              attribute is set to yes, and the volume may be labeled at a
              later date. The Monitor device operation is never performed on
              jukebox devices, because NetWorker only monitors non-jukebox
              devices.

       volume write time   (read-only, dynamic, hidden)
              This attribute indicates the time that a save set was first
              written to the volume.

       volume error number (read-only, dynamic, hidden)
              This attribute indicates the last error number reported for this
              device. This is a numeric value encoded with the source, sever-
              ity and the actual error number. Processes check for this value
              only on error in a media operation when the media operation is
              known to update this field, e.g., a label verify. The error num-
              ber is not reset on a successful media operation, so it is not
              an indication of the status of the last media operation, but
              just the last error number reported for this device.

       volume block size   (read-only, dynamic, hidden)
              This attribute indicates the block size of the currently mounted
              volume.

       volume id (read-only, dynamic, hidden)
              This attribute indicates the volume id for the currently mounted
              volume.

       long volume id (read-only, dynamic, hidden)
              This attribute indicates the volume id for the currently mounted
              volume in the long globally unique format.

       accesses  (read-only, hidden)
              This attribute indicates the total number of operations per-
              formed on the device since it was configured as a NetWorker
              device.  Changes to this attribute are propagated to all devices
              that have the same hardware id value.

       access weight  (read/write, hidden)
              This attribute indicates the weight of a single operation per-
              formed on the device.  The "accesses" attribute will be incre-
              mented by "access weight" each time an operation is performed on
              the device.  The higher the weight, the less often the device
              will be selected for new operations.  Changes to this attribute
              are propagated to all devices that have the same hardware id
              value.

       consecutive errors  (read-only, dynamic, hidden)
              
              This attribute indicates the current number of consecutive
              errors on a device.  Changes to this attribute are propagated to
              all devices that have the same hardware id value.

       max consecutive errors   (read/write, hidden)
              This attribute indicates the maximum number of consecutive
              errors allowed before disabling the device.  Changes to this
              attribute are propagated to all devices that have the same hard-
              ware id value.

       operation arg  (read-only, dynamic, hidden)
              This attribute indicates extra parameters to be used during
              device operations.  Parameters are packed into a string and
              parsed by the associated operation's function.

       volume message (read-only, dynamic, hidden)
              This attribute indicates the result of the last volume opera-
              tion.

       event tag (read/write, single number, hidden)
              This attribute contains the tag (unique identifier) of the last
              notification event sent to the nsrd (1) daemon.  The tag is used
              to clear the previous event.  This attribute is used to pass
              information between NetWorker programs, and should not be
              changed manually by the administrator.

       NSR operation  (read-only, dynamic, hidden)
              This attribute indicates the current operation being performed
              by a device.  The valid values for this attribute are: Idle,
              Write, Read, Eject, Verify label, or Label.
              Example: NSR operation: Write;

       minor mode     (read-only, dynamic, hidden)
              This attribute indicates the current state of a device.  The NSR
              operation attribute is the major mode.  The valid values for
              this attribute are: idle, reading, writing, rewinding, moving
              forward, moving backward, error, done, writing eof, or finding
              eom.
              Example: minor mode: moving forward;

       jukebox device (read/write, dynamic, hidden)
              This attribute indicates the media device that is part of a
              jukebox device.  This value can be either yes or no.

       statistics     (read-only, dynamic, hidden)
              This attribute reports the statistics for the operation of this
              device.  The statistics include:
              the time of operation ("elapsed"), the number of errors
              ("errors"), the last writing rate ("last rate"), the maximum
              number of concurrent clients ("max clients"), the number of file
              marks written ("file marks"), the number of rewinds ("rewinds"),
              the number of files skipped ("files skipped"), the number of
              records skipped ("records skipped"), the current file number
              ("current file"), the current record number ("current record"),
              the relative number of files being spaced over ("seek files"),
              the relative number of records being spaced over ("seek
              records"), the total estimated amount read/written on the vol-
              ume, in KB ("estimated KB", to be implemented in a future
              release), the total amount read/written on the volume, in KB
              ("amount KB"), the current amount read/written on this file, in
              KB ("file amount KB"), and the current number of sessions
              assigned to this device ("sessions").

       cleaning required   (read/write)
              This attribute indicates whether a device needs to cleaned. The
              value for this attribute may be either yes or no. If the value
              of this attribute changes from yes to no and the value of date
              last cleaned attribute is not updated, then the date last
              cleaned attribute is set to the current time. NetWorker might
              set this attribute to yes if, at the time the device is next
              scheduled to be cleaned, it is not available to be cleaned. In
              this case, the following message is displayed: device cleaning
              required.  This message indicates that the device needs to be
              cleaned.  This attribute can only be used for a device whose
              media family is tape and jukebox device is yes.  For all other
              devices, the value of this attribute is always no.

       cleaning interval   (read/write)
              This attribute indicates the amount of time from the date last
              cleaned until the next scheduled cleaning for the device. This
              value can be specified in days, weeks, or months. One day, week,
              or month is implied if a number is not specified. If this
              attribute is set and date last cleaned is blank, date last
              cleaned is set to the current time.  This attribute may only be
              used for a device whose media family is tape and jukebox device
              is yes.
              Example: cleaning interval: 2 weeks;

       date last cleaned   (read/write)
              This attribute indicates the time and day a device was last
              cleaned.  Input may be in any format acceptable to
              nsr_getdate(3).  Some values acceptable to nsr_getdate(3) are relative,
              for example, now. For that reason all input is converted into
              ctime(3) format, weekday, month, day, time, year.  As noted in
              the description of cleaning required and cleaning interval , the
              value of this attribute might be set automatically by NetWorker.
              This attribute can only be used for a device whose media family
              is tape

       auto media management    (read-write)
              This attribute indicates whether "automated media management" is
              enabled for a device.  For jukebox devices this value is always
              no.  See nsr_jukebox(5) for a description of auto media manage-
              ment for a jukebox.  For non-jukebox devices, this value can be
              either yes or no.  If this value is set to yes, then any recy-
              clable volumes loaded into the device might be automatically re-
              labeled by NetWorker for re-use, and unlabeled volumes loaded
              into the device can be automatically labeled.  When NetWorker is
              labeling a volume that is not expected to have a valid NetWorker
              label, it verifies that the volume is unlabeled before labeling
              the volume.  A volume is considered to be unlabeled if the vol-
              ume does not contain a label that may be read by this device.
              Note: If a volume contains a label, but the label is written at
              a density that cannot be read by the associated device, the vol-
              ume is considered to be unlabeled.  If the volume contains data
              written by an application other than NetWorker, it most likely
              does not have a label recognizable by NetWorker, and the volume
              is considered to be unlabeled.  With this attribute enabled,
              care should be taken when loading any volume considered to be
              unlabeled or recyclable into the device.  The volume might be
              re-labeled and the data previously on the volume over-written by
              NetWorker.
              When this attribute is set to yes for a device, and the device
              is idle (no tape loaded into the device), NetWorker will monitor
              the device and wait for a volume to be loaded.  See the descrip-
              tion of Monitor device in the discussion of the volume operation
              attribute.
              Example: auto media management: yes;

       NDMP (read-only)
              This attribute is used to note which devices are associated with
              NDMP servers.  This attribute cannot be changed after the
              resource has been created.  The resource must be deleted and
              recreated if the user needs to change this attribute for this
              device.  The same username (remote user attribute) and password
              should be configured in the device resource as they are config-
              ured for the NDMP server.
              Example: NDMP: yes;
              
       max active devices  (read-write)
              This attribute set the maximum number of devices NetWorker may
              use from the storage node associated with the device.  All
              devices on a storage node must have the same value for this
              attribute. When this attribute is modified, the new value is
              propagated to all other devices on the storage node.  The
              default value for this attribute is NULL = no limit on the num-
              ber of active devices on the storage node.  For newly created
              devices the value of this attibute is inherited from other
              devices on the same storage node or set to the default value of
              NULL if there are no other devices on the storage node.  Value
              for this attribute must be an integer greater than the number of
              non-shared devices on the storage.  This attribue can only be
              set on storage nodes with shared devices.

       dedicated storage node   (read-write)
              The value for this attribute can be either yes or no.  The value
              of this attribute determines whether a storage node is a dedi-
              cated storage node.  A dedicated storage node can only back up
              its local data.  All devices on a storage node must have the
              same value for this attribute.  When a device is created or the
              value of this attribute is modified, the value of this attribute
              is propagated to all other devices on the storage node.
              Example: dedicated storage node: yes;

       remote user         (read/write, string)
              This attribute is used when the NDMP attribute is set to a value
              of yes.  The value entered for this attribute should be the
              username configured for the NDMP server.  This attribute is also
              used when creating an adv_file device of a network drive on Win-
              dows storage node.  Specify remote user attribute as the user
              name for the Windows storage node (nsrmmd) to connect to the
              network drive.
              Example: remote user: root;

       password  (read/write, encrypted)
              This attribute is used in conjunction with the remote user
              attribute to configure access to a NDMP server.  This attribute
              is also used in conjunction with the remote user attribute to
              connect to an adv_file device of a network drive on Windows
              storage node.
              Example: password: ;

       unlabeled volume loaded  (read-only, dynamic, hidden)
              This attribute indicates whether a volume loaded into the device
              has a readable NetWorker volume label. This value can be either
              yes or no.  This attribute is set to yes when NetWorker is moni-
              toring the device, a volume is loaded into the device, and the
              volume does not have a valid NetWorker label that can be read by
              this device.  This attribute is set to no when the volume in the
              device is labeled or ejected from the device.

       logical name   (read-only, hidden, no create)
              This attribute indicates the name of the actual device associ-
              ated with the logical device.  This attribute is only used for
              logical devices.
              Example: logical name: /dev/rmt/0hbn;

       logical family (read-only, hidden, no create)
              This attribute indicates the family of the actual device cur-
              rently associated with the logical device. The values that can
              be associated with this attribute are the values that are valid
              for the media family attribute.  The only exception is that the
              value of this attribute cannot be set to logical.  This
              attribute is only used for logical devices.
              Example: logical family: tape;
              
       logical type   (read-only, hidden, no create)
              This attribute indicates the actual device type associated with
              the logical device.  The values that can be associated with this
              attribute are the values that are valid for the media type
              attribute.  The only exception is that the value of this
              attribute cannot be set to logical.  This attribute is only used
              for logical devices.
              Example: logical type: 8mm 5GB;

       connection process id    (read-only, hidden, no create)
              This attribute indicates the process identifier maintaining the
              connection with an external media management service.
              External media management services often require a connection to
              be maintained while an application is using allocated resources.
              If the connection is not maintained, the service may attempt to
              reclaim any resources allocated to an application. This may
              include unloading a volume currently mounted into a device.
              Therefore, while NetWorker has a volume mounted into a device
              being managed by such a service, a process must maintain an open
              connection with the media management service.

       connection message  (read-only, hidden, no create)
              This attribute records any error message(s) reported upon exit
              by a process maintaining a connection with an external media
              management service.

       connection status   (read-only, hidden, no create)
              This attribute records the exit status reported by a process
              maintaining a connection with an external media management ser-
              vice. A status of zero indicates that the process exited suc-
              cessfully.  A non-zero status indicates an error occurred while
              the process was exiting.

       hardware id    (read/write)
              This attribute represents the unique identification of a shared
              physical drive, which can be accessed by multiple device
              resources.  Each device resource that shares the same physical
              drive must have the same value for this attribute.  It can only
              be updated when the device is disabled and not within a jukebox
              resource.  When a value is defined for this attribute, corre-
              sponding device messages will contain a number that uniquely
              represents the hardware id attribute, and will be visible in
              administrator commands, such as NetWorker Management Console and
              nsrwatch(8). This number identifies the devices that share the
              same physical drive.

       save mount timeout  (read/write, hidden, no create)
              This attribute indicates the timeout value for an initial save
              mount request for the storage node on which a device is located.
              If the request is not satisfied within the indicated time, the
              storage node will be locked from receiving save processes for
              the "save lockout" time.  See nsr_storage_node(5) for a descrip-
              tion of storage nodes.  This attribute can be used for local
              devices as well, but "save lockout" cannot be changed from its
              default value of zero.  Hence, local devices cannot be locked
              out from save requests.

       save lockout   (read/write, hidden, no create)
              This attribute indicates the number of minutes a storage node
              will be locked from receiving save assignments after it reaches
              the save mount timeout time during a save mount request.  A
              value of zero indicates that the node will not be locked.  This
              attribute cannot be changed for local devices.

       CDI  (read-write, no create)
              This attribute indicates whether CDI (Common Device Interface)
              is used to communicate with this device and if so, which CDI
              method is used.  The value for this attribute is one of:

                 Not used
                      NetWorker will use the same method to communicate with a
                      device as in versions up to and including 6.x. This set-
                      ting is mainly for debugging purposes, since selecting
                      Not used essentially turns off the use of CDI.

                 SCSI commands
                      NetWorker will use the CDI interface to send explicit
                      SCSI commands to tape drives.  This allows the best
                      control of and status collection from a device and is
                      the default for SCSI or SCSI-like tape drives directly
                      under NetWorker's control.
                      
                 Tape driver commands
                      NetWorker will use all available functions that are
                      present in the operating system's tape driver interface.
                      There are many capabilities that tape drivers lack which
                      are unavailable to NetWorker if this setting is
                      selected.	 Also, different OSes support different func-
                      tions, so devices may behave differently on different
                      platforms if this choice is selected.

                 Generic tape driver commands
                      NetWorker will use only those functions that are present
                      on all Unix platforms.  This will give results similar
                      to the Not used selection, except that CDI code will be
                      used instead of the pre 7.0 code.

                 NDMP NetWorker will use NDMP to control NDMP connected tape
                      devices.	The exact functions available will likely
                      depend on the NDMP server being used.

                 iSCSI
                      NetWorker will use iSCSI commands to control iSCSI con-
                      nected tape devices.

       Example:
              CDI: SCSI commands;

       device block size   (read-write, single number, hidden)
              This attribute allows you to override the device's default block
              size on a per-device basis. Allowable values are  handler
              default (the default setting for this attribute), 32kB, 64kB,
              96kB, 128kB, 160kB, 192kB, 224kB, 256kB, 384kB, 512kB, 640kB,
              768kB, 896kB, and 1024kB.  Note that the block size for a Net-
              Worker volume is set when the volume is labeled, so a change to
              this attribute will not have any effect until a volume is recy-
              cled.  Also, resetting this attribute to  handler default will
              not have any effect until the nsrmmd daemon for this device is
              restarted.  Also, hardware platform limitations may result in
              the use of a block size smaller than that selected in this
              attribute, as some SCSI adapters or adapter drivers place limits
              on the maximum size of a SCSI transfer. These limits are usually
              silently enforced by NetWorker.

       device file size    (read-write, single number, hidden)
              This attribute allows you to override the default tape file size
              used by NetWorker for this device.  The file size is the number
              of blocks (tape records) that NetWorker will write before writ-
              ing a filemark to the tape.  Allowable values are between 100
              and 3,000,000.

       device load time    (read-write, single number, hidden)
              This attribute allows you to override the default load time used
              by NetWorker for this device.  The load time is the number of
              seconds that NetWorker will continue trying to open a tape
              device after loading it into a tape drive.  Allowed values are
              between 10 and 900 seconds.

              This attribute is only used when CDI is set to Not used.

       device eject time   (read-write, single number, hidden)
              This attribute allows you to override the default tape eject
              time used by NetWorker for this device.  The eject time is the
              number of seconds that NetWorker will wait for a tape drive to
              eject a tape before trying to remove the tape from the drive.
              Allowed values are between 30 and 900 seconds.

       device poll interval     (read-write, single number, hidden)
              This attribute allows you to override the default tape polling
              interval used by NetWorker for this device.  The polling inter-
              val is the number of seconds that NetWorker will wait between
              successive attempts to determine whether a tape drive is ready
              for use.	Allowed values are between 1 and 30 seconds.

       device min load tries	(read-write, single number, hidden)
              This attribute allows you to override the load try limit used by
              NetWorker for this device.  The load try limit is the minimum
              number of times that NetWorker will attempt to determine if a
              tape drive is ready for use.  This is primarily intended for
              operating systems where the open() system call to a tape drive
              that is not yet ready takes a very long time to fail. Allowable
              values are between 2 and 120.

              This attribute is only used when CDI is set to Not used.

       device tape flags   (read-write, hidden)
              This attribute allows you to override the default flags used by
              NetWorker for this device.  The flags are settings that control
              major aspects of how NetWorker interacts with a device.  Allow-
              able values are TAPE, NOEOM, PHYSREC, SIZED, NOBSF, FILE,
              FILESYS, 32K, separated with either spaces or an 'or' symbol
              (|), and possibly preceded by an 'or' symbol (|).

              WARNING: You should only use this attribute if you have been
              instructed to by Legato Technical Support, as misuse can cause
              the loss of data on any tapes that get loaded into the drive
              when this attribute is set to anything other than the default
              empty value.

       device default capacity  (read-write, single number, hidden)
              This attribute allows you to override the default capacity used
              by NetWorker for this device.  The default capacity is a typical
              value for the uncompressed storage capacity for drives of a
              given device type, and does not take different tape sizes or
              compression methods into account.  It is only used for rough
              informational purposes and has no effect whatever on the amount
              of data that NetWorker will write to a tape.

              This attribute is only used when CDI is set to Not used.

       TapeAlert Critical  (read-write, no create)
              This attribute stores a list of any Critical TapeAlert flags
              that may have been collected from a tape drive during opera-
              tions.  Critical flags are those that might result in data loss.
              Often, these will require user intervention to resolve.

              There are several Critical flags that will automatically be
              cleared by NetWorker when the particular flag no longer pertains
              to the drive.  (The actual TapeAlert flag number is in parenthe-
              ses after the flag name):

                 Media (4)
                      unrecoverable read, write or positioning error caused by
                      tape

                 Write protect (9)
                      Attempt to write to a write-protected tape

                 Recoverable snapped tape (13)
                      tape has snapped in a drive where the tape can be
                      ejected

                 Forced eject (16)
                      The tape was manually ejected from the drive

                 Clean now (20)
                      The tape drive needs to be cleaned
            Note that all of the TapeAlert attributes really should be
            "delete-only" lists, since they are used purely to report problems
            that the hardware reports to us.  However, NetWorker does not have
            a "delete only" attribute, so these are read-write.	 NetWorker
            does use the values held in these attributes to suppress repeated
            warnings about a problem that has already been reported in the
            daemon log, messages file and any NetWorker administrative GUI
            that might be open.

       TapeAlert Warning   (read-write, no create)
              This attribute stores a list of any Warning TapeAlert flags that
              may have been collected from a tape drive during operations.
              Warning flags are those that do not indicate the immediate dan-
              ger of data loss, but do represent some aspect of device opera-
              tion that may lead to data loss in the future.

              There are several Warning flags that will automatically be
              cleared by NetWorker:

                 Read warning (1)
                      The drive is having problems reading from the tape.  No
                      data has been lost but performance may suffer

                 Clean periodic (21)
                      The drive is due for routine cleaning

       TapeAlert Information    (read-write, no create)
              This attribute stores a list of any Information TapeAlert flags
              that may have been collected from a tape drive during opera-
              tions.  Information flags represent occurrences that should be
              noted but which will not lead to loss of data.

              There are several Information flags that will automatically be
              cleared by NetWorker:

                 No removal (10)
                      An attempt was made to eject a tape when the drive was
                      in use

                 Cleaning media (11)
                      The tape in the drive is a cleaning tape and cannot be
                      used for data

                 Unsupported format (12)
                      The tape in the drive is a format that is not supported
                      by the drive

                 Nearing media life (19)
                      The tape cartridge is nearing the end of its specified
                      life

       autodetect id  (read/write, hidden)
              This attribute is for identifying auto-detected devices.  It is
              used by NetWorker programs only, and should not be changed manu-
              ally by the administrator.
              
       server network interface	 (read/write, hidden)
              This attribute defines the network address or the hostname which
              is used to communicate with mmd. This field is only relevant, if
              the device is connected to a storage node.
              


EXAMPLE

       A complete example follows:

                           type:  NSR device;
                           name:  /dev/nrst8;
                        message:  writing, done
                    volume name:  mars.017;
                   media family:  tape;
                     media type:  8mm 5GB;
                        enabled:  Yes;
                 shared devices:  done;
         dedicated storage node:  No;
                  write enabled:  Yes;
                      read only:  No;
                target sessions:  4;
                   volume label:  mars.017;
        volume default capacity:  ;
        volume current capacity:  5000 MB;
              volume expiration:  "Thu Sep 21 17:23:37 1996";
                    volume pool:  Default;
                   volume flags:  ;
               volume operation:  ;
              volume write time:  ;
              volume block size:  32 KB;
                      volume id:  32449;
                       accesses:  199;
                  access weight:  1;
             consecutive errors:  0;
         max consecutive errors:  20;
                  operation arg:  ;
                 volume message:  ;
                  NSR operation:  ;
                     minor mode:  idle;
                 jukebox device:  Yes;
                     statistics:  elapsed = 257572, errors = 0, last rate = 397,
                                  max clients = 3, file marks = 22, rewinds = 4,
                                  files skipped = 1976, records skipped = 0,
                                  current file = 2389, current record = 162,
                                  seek files = 0, seek records = 0,
                                  estimated kb = 0, amount kb = 6273,
                                  file amount kb = 6273, sessions = 1;
              cleaning required:  No;
              cleaning interval:  2 weeks;
              date last cleaned:  "Tue Apr 11 15:10:32 1995";
          auto media management:  No;
        unlabeled volume loaded:  No;
                   logical name:  ;
                   logical type:  ;
                 logical family:  ;
          connection process id:  ;
             connection message:  ;
              connection status:  ;
                    hardware id:  ;
             save mount timeout:  30;
                   save lockout:  0;
                            CDI:  SCSI commands;
              device block size: handler default;
        device default capacity: 20GB;
              device eject time:;
               device file size:;
               device load time: 120;
          device min load tries:;
           device poll interval:;
              device tape flags:;
             TapeAlert Critical:  Media, Cleaning;
          TapeAlert Information:  Read warning;
              TapeAlert Warning:  Cleaning media;
                            

FILES

       /nsr/res/nsrdb - files in this directory should never be edited
       directly. Use nsrmm(8), nsradmin(8), or NetWorker Management Console
       instead.


SEE ALSO

       nsr_getdate(3), ctime(3), nsr_resource(5), nsr_pool(5), nsr_schedule(5),
       nsr_service(5), nsr_storage_node(5), nsr_render_log(8), nsr(8),
       nsrmmd(8), nsrmm(8), nsradmin(8)

NetWorker 8.0.1 		Dec 02, 12 			nsr_device(5)