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Choice of Volsers Upon Logical Volume Insertion
When inserting a logical volume into the 3494 Tape Library, the following items
must be specified:
v starting volser
v ending volser
v VTS partition to which the volsers are assigned
v media type
The 3494 Tape Library determines the number of volumes to insert from the
starting and ending volsers specified. For example, a starting volser of AAA000
and an ending volser of AAB999 will insert 2000 logical volumes. The volumes
inserted in this example are:
v AAA000
v AAA001 through AAA999
v AAB000
v AAB001 through AAB999
Note the following in the preceding example:
1. The format of the starting and ending volsers are the same (that is, the
2. Volsers are created by incrementing numeric characters numerically and
The 3494 Tape Library checks whether any volsers of a different media type or VTS
partition fall within the range entered for the logical volumes to be inserted. If any
volsers do overlap, the logical volumes are not inserted and the Library Manager
console displays the following message:
The logical volume range entered overlaps existing volumes of a different
media type or partition. Reenter the range so that it doesn't conflict.
Note that an overlap is allowed if the redundant volsers are in the same VTS
partition and and are of the same media type. In this case, the existing volsers are
not reinserted.
The 3494 Tape Library performs the overlap check by examining the Library
Manager database. However, the database search does not increment alphabetic
characters alphabetically and numeric characters numerically as described above.
Rather, the search increments each character numerically from "0" and then
alphabetically from "A". In the preceding example, the search would start at
AAA000 through AAA009 and then increment to AAA00A through AAA00Z. The
search would then sequence as follows: AAA010 through AAA019, AAA01A
through AAA01Z, AAA020 through AAA029, AAA02A through AAA02Z, etc.
In summary, while a set of logical volumes to be inserted might not actually
overlap existing volsers, the insertion might fail because the check will indicate an
overlap. As an example, assume a set of stacked physical volumes exists in the
3494 Tape Library and has volsers J1A001 through J1A500 assigned, corresponding
to a set of 500 physical volumes. The operator attempts to insert 20,000 logical
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3494 Tape Library Operator Guide
characters at the same position in both the starting and ending volsers are of
the same type, either alphabetic or numeric). This must be true for the volsers
to be valid. If the starting volser were AAA000 and the ending volser were
AAAB01, this combination would be invalid because the 4th character in each
are not of the same type.
alphabetic characters alphabetically. This matches how physical cartridge volser
labels are ordered.
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