IBM System Storage TS3500, Introduction And Planning Manual

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production environments. Thus, the performance values show the relative
performance of the systems and may not be absolute indicators of performance in
your specific environment.
Some of the specific assumptions may not pertain to a given operating
environment. Actual performance may vary. Accordingly, the performance
information for this product does not constitute a performance guarantee or
warranty. Verify that the performance of the library is acceptable in your specific
environment.
The sections that follow describe the library's performance.
Inventory times
This section describes inventory times for frames in the TS3500 Tape Library and
inventory with audit times for HD frames.
The typical time required for the TS3500 Tape Library to inventory cartridges is
less than 60 seconds per frame.
An inventory operation includes a check to determine whether each cartridge
storage slot in the library is empty or full, and a scan of the bar code labels. An
inventory occurs whenever you:
v Power on the TS3500 Tape Library
v
Issue the SCSI Initialize Element Status with Range command
v
Select the appropriate menu options from the Tape Library Specialist Web
interface (see the section about performing an inventory of the library in the
IBM System Storage TS3500 Tape Library with ALMS Operator Guide )
v
Select Inventory from the Manual Operations menu on the library's operator
panel
v
Close the front door after manually accessing the inventory
Note: The TS3500 Tape Library tracks the logical location of all of its elements by
performing an automatic inventory as required (if you issue the SCSI Initialize
Element Status command, it is allowed but ignored). The automatic inventory
improves application performance.
When the library performs an automatic inventory because the front door was
closed, the inventory occurs only for those frames whose doors have been opened.
Inventory with audit times
The process of moving cartridges in an HD slot in order to scan each barcode label
is referred to as an
audit . For all inventory operations, an HD slot is only audited
when one of the following changes occurs:
v A Tier 1 cartridge barcode label has changed
v
Enough Tier 1 barcode labels have changed in a column to warrant an audit of
the entire column of HD slots
An audit can also be requested via the Tape Library Specialist Web interface or by
using a vendor-specific SCSI command.
Note: It is recommended that manual access of HD slots be limited to the initial
bulk loading of the frame.
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IBM System Storage TS3500 Tape Library with ALMS: Introduction and Planning Guide