IBM TotalStorage 3494 Tape Library, Operator'S Manual

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Inventory Update
When Inventory Update is enabled and a door is opened, then closed, an
inventory update is performed upon the return to Auto mode. This process checks
all of the cartridge storage cells in the frames that had doors opened, and
depending on the selection made during the teach process, may also check any
frames adjacent to the frames that had doors opened.
Note: The drive feeds are also inventoried.
During an inventory update, processing of Audit and Eject operations are held
until the update has been completed. Selected mounts and demounts are
processed, depending on where the cartridge resides. No mounts or demounts are
performed on cartridges that reside in a rack that must be verified in the Inventory
Update operation until the inventory update is complete. The duration of the
Inventory Update operation is affected by the number of database updates
required and the number of mounts and demounts that are done concurrently with
the inventory update.
When the 3494 Tape Library is powered on, the Disable Inventory Update option
is available in the Mode Selection window. This option, if selected, disables the
inventory update during a cold start of the 3494 Tape Library and speeds up the
process of bringing the 3494 Tape Library online. Selecting the Disable Inventory
Update
option in the Mode Selection window does not disable inventory update
during normal operation.
The Disable Inventory Update option is available under the Inventory option in
the Commands window. This option disables the Inventory Update process on a
cold start of the 3494 Tape Library during normal operations and speeds up the
process of changing modes after the doors on the 3494 Tape Library are opened.
Note: The Disable Inventory Update option is not recommended for users who
open the 3494 Tape Library doors to add and to remove cartridges because
no changes in the 3494 Tape Library inventory are noted until an
Inventory Update is performed . If cartridge inserts and ejects are handled
through the convenience I/O station or the high-capacity I/O facility, then
running with Inventory Update disabled speeds operation. When the doors
have been opened, you can select the Partial Inventory Update option
under the Inventory option in the Commands window; this provides the
most flexibility.
The Enable Inventory Update option is also available under the Inventory option
in the Commands window. This option allows you to enable the Inventory Update
process. An inventory update would then be done on all doors at initialization and
following Manual mode and to all doors opened during the transition from Pause
mode to Auto mode.
Inventory update determines if any cartridges have been added, removed, or
moved, and the Library Manager updates the cartridge inventory. During an
inventory update, one of the three following activities takes place:
v If a cartridge is found in its expected location, no update takes place.
v
If a cartridge is found that is not in the inventory, the inventory is updated, with
volser added to the Insert category.
v If a cartridge in the inventory is not found, it is placed in the manually ejected
category.
Chapter 3. Operational Characteristics
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