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Database
The library manager creates and maintains a database that contains the
configuration of the library, the physical location information for all the elements of
the library serviced by the cartridge accessor, the inventory of the physical cartridge
volumes and logical volumes managed by a VTS, and information about their use
and current status, and the status of each 3490E/3590 device and virtual device. As
operations progress through the library, the database is dynamically updated on the
disk drive to reflect the current status of the library.
High Availability (Model HA1)
If the high availability model is installed, a second library manager is provided in the
right-hand service bay. Each library manager contains two hard (disk) drives, a
primary and secondary disk. Under normal operation, one library manager is the
active library manager and the other library manager is the standby library manager.
The active library manager, on its primary disk, creates and maintains the database,
which is dynamically updated to reflect the current status of each library. The
standby library primary disk contains a back-up of the database, which is also
dynamically updated to reflect the current status of the library.
If the active library manager fails, the standby library manager automatically
becomes the active library manager and takes control of operations. A new backup
database is then created on the active library manager's secondary disk drive. The
new active library manager runs in degraded mode until the failing library manager
is repaired. This allows continued operation of the 3494.
Database Information Available to a Host
The library manager maintains information in its database that may be requested
through a host. The form of the particular host request is dependent on the host
environment. The following information is available through the host:
Category inventory data
Device data
Expanded volume data
Inventory volume count
Inventory data
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Magstar 3494 Tape Library Operator Guide
Records for 100 volumes in the library for the category specified, starting
after the sequence number specified by the request. If fewer than 100
volumes are in the category, all of the remaining records are returned. Each
record contains the current status and media-type for a volume in the
inventory.
Information about any particular device within the library. This information
includes the device states, volser, and category of the mounted cartridge.
More detailed information about the current status and media-type for a
specific volume than the volume data information request. It does not
provide physical location information for the volume.
The number of volumes in the library for either the entire inventory or a
specified category.
Records for 100 volumes in the library, starting after the volume specified
by the request. If fewer than 100 volumes remain in the library, all of the
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