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The Enable Inventory Update option is also available from the Commands
pull-down. This option allows the user to enable the inventory update process.
Inventory Update would then be done on all doors at initialization and following
manual mode and to all doors opened on the transition from pause to auto.
Inventory update determines if any cartridges have been added, removed, or
moved, and the library manager updates the cartridge inventory. During 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.
v If an unlabeled cartridge is found, the cartridge is ejected from the library unless
the unlabeled cartridge was inserted by using the Unlabeled Tape facility and the
unlabeled cartridge is found in its home cell.
See “Insert Unlabeled Cartridges” on page 184 for information regarding the use
of unlabeled cartridges.
Volume Categories
The host can associate volumes into logical groupings in the library. A logical
grouping is called a category, which the library manager identifies by a hexadecimal
number from 0000 to FFFF. Table 3 shows the assignment of the categories.
The library manager maintains the order in which volumes are added to a category.
The volumes chosen from a category are managed by a first-in first-out (FIFO) rule.
However, if during the choosing of a volume from a category, the next volume is in
use, inaccessible, or misplaced, the volume is skipped and the next available
volume is chosen.
Note: For logical volumes in a “Fast-Ready” category, an odd/even volser selection
algorithm is used to maximize VTS performance.
Table 3. Volume Categories
Category
(in hex) Name Definition
0000 Null Set when the library command specifies that the
category already associated with the volume is to be
used or the command does not specify a category.
Using the null category does not affect the volume’s
order within the category to which it is assigned.
Logical volumes are also added to the FF00 when they
are inserted via the panel. See “Insert VTS Logical
Volumes” on page 163
0001 to
FEFF
General programming
use
Assigned by the host control program.
Note: Categories FF00 to FFFE are reserved for hardware functions.
48 Magstar 3494 Tape Library Operator Guide