HP Archive Backup System for OpenVMS Guide to Operations

Media Management
4.3 Drives
4.3.5 Drive Number
4.3.6 Groups
4.3.7 Jukebox
4.3.8 Media Types
4.3.9 Nodes
If the drive is in a robotically-controlled jukebox, and the jukebox is controlled by MRD, you
must set the drive number to the relative drive number in the jukebox used by MRD. Drives in
jukeboxes are numbered from 0 to n, according to the SCSI addresses of the drives. Refer to the
jukebox documentation on how to specify the relative drive number.
The groups attribute contains a list of groups containing nodes that have direct access to the
drive. Direct access includes direct-SCSI access, access via a controller such as an HSJ70,
access via TMSCP, and access via Fibre Channel. You can specify as many groups as you wish,
in addition to nodes that may not be in a group.
If the drive is in a jukebox, you must specify which jukebox using the jukebox attribute. Enter a
valid jukebox name from an MDMS-defined jukebox. If there is no jukebox, MDMS treats the
drive as a standalone drive or as a stacker.
A drive must support one or more media types in order for volumes to be used on the drive. In
the media type attribute, specify one or more MDMS-defined media types that this drive can
both read and write. If you wish, you can restrict the media types to a subset that you wish this
drive to handle, and not all the media types it could physically handle. In this way, you can
restrict the drive’s usage somewhat.
The nodes attribute contains a list of nodes that have direct access to the drive. Direct access
includes direct-SCSI access, access via a controller such as an HSJ70, access via TMSCP, and
access via Fibre Channel. You can specify as many nodes as you wish, in addition to groups of
nodes in the groups attribute.
4.3.10 Read-Only Media Types
4.3.11 Shared
4.3.12 Stacker
In addition to media types that a drive can read and write, a drive may support one or more additional
media types that it can only read. In the read-only media type attribute, specify one or
more MDMS-defined media types that this drive can only read. This allows this drive to be used
when the application operation is read-only (for example, HSM unshelves or ABS restores). Do
not duplicate a media type in both the media type list and read-only media type list.
You can designate whether a drive is to be used by MDMS applications and users only, or by
non-MDMS users. If the drive is not shared, the MDMS server process allocates the drive on all
clusters to prevent non-MDMS users and applications from allocating it. However, when an
MDMS user attempts to allocate the drive, MDMS will deallocate it and allow the allocation. Set
the shared attribute if you wish to share the drive with non-MDMS users, and clear if you wish to
restrict usage to MDMS users. ABS users who do their own user backups are considered MDMS
users, as are all system backups and HSM shelving/unshelving users.
Certain types of drive can be configured as a stacker, which allows a limited automatic sequential
loading capability of a set of volumes. Such drives may physically reside in a loader or have
specialized hardware that allows stacker capabilities. If you wish the drive to support the stacker
loading capability, set this attribute and make sure the jukebox attribute does not contain a jukebox
name. If you wish the drive to operate as a jukebox or standalone drive, clear this attribute.
4-6 Media Management