HP Archive Backup System for OpenVMS Guide to Operations

4.11.5 Media Types
4.11.6 Pool
Media Management
4.11 Volumes
A volume’s media types define the type of media for the volume, and what potential compaction
or density options the volume can support. As such, before a volume is initialized, it can potentially
support many media types. However, once a volume is initialized, MDMS uses the density
and compaction attributes from a media type to physically write the tape. As such, a volume
should only support one media type at and after the first initialization.
If the volume is in the Uninitialized state, select one or more MDMS-defined media types for the
volume. If the volume is in any other state, select a single media type. If no media type is specified,
the domain default media type is used.
A pool contains a collection of volumes that can be used by a set of authorized users. To insert a
volume into a pool, simply specify a pool name in the volume’s pool field. If not defined, the
volume is placed in the “scratch pool”, and it can be allocated by any user. If the volume is in the
free state, the number of free volumes in the pool is incremented.
4.11.7 Previous and Next Volumes
These read-only fields indicate if a volume is in a volume set, and what the previous and next
volumes are in the set, relative to this volume. A volume set is created when a tape write operation
reaches end-of-tape and a new tape is required to complete the operation. ABS and HSM
bind the next volume to the current volume, and create a volume set.
These fields are manipulated by “Bind Volume” and “Unbind Volume” operations, both manually
and under control of MDMS applications.
4.11.8 Placement - Jukebox, Magazine, Locations, Drive
The placement fields of a volume indicate where the volume resides, and where it should reside
when moved to an onsite or offsite locations. The placement attributes include the following:
• Placement - The current placement of the volume - options can be:
– Drive - The volume is in a drive, indicated by the drive field
– Jukebox - The volume is in a jukebox, indicated by the jukebox field and the slot field
– Magazine - The volume is in a magazine, indicated by the magazine field and slot field
– Offsite - The volume is in an offsite location, indicated by the offsite location field
– Onsite - The volume is in an onsite location, indicated by the onsite location field, with
optional space field
– Moving - The volume is moving between one place and another
Placement is a protected field managed by MDMS. You should not change placement unless
error recovery is needed.
• Drive - The name of the drive containing the volume. This field may contain a value even if
the volume is not currently in a drive. The drive is a protected field managed by MDMS.
You should not change drive unless error recovery is needed.
• Jukebox - The name of the jukebox containing the volume. The jukebox is a protected field
managed by MDMS. You should not change jukebox unless error recovery is needed. The
slot field indicates the jukebox slot the volume is in, and is filled in even if the volume is
actually in a drive.
• Magazine - The name of the magazine containing the volume. The magazine is a protected
field managed by MDMS. You should not change placement unless error recovery is
Media Management 4–23