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SCSI element addressing

Every logical library starts at the first drive slot with the current assigned element start address (default

value 256). It is incremented from the bottom to the top slots for every drive slot. There is one exception

to this addressing scheme to accommodate libraries currently in the field. A 4U library that contains only

full height drives continues to have the addresses assignments 256 and 257, thus causing no interruptions

to their operation. Drive slots are incremented by 1 for each drive slot position.

Note: Exchanging drives with different form factors results in the library that needs to be reconfigured.

The SCSI specification does not allow gaps in the SCSI element addressing. Special handling is needed

for empty drive slots to fulfill the specification. Also temporarily removed drives must have their

addresses that are preserved to not confuse the attached host and host application. Generally only drives

that are physically available or temporarily removed are reported. Empty (unused) slots that are located

at the bottom or the top must not be reported, with an exception in a "removed" condition. A drive slot

that does not contain a drive, and has a position between used slots, must be reported as a SCSI element.

To signal the host application that this slot is not usable, its ACCESS bit is disabled.

Note: When the number of drives in your library are reduced, update the Logical Library configuration.

This removes the Attention LED on the front panel and the exclamation mark on the Home screen that

indicates that a drive is missing.

Updating the Logical Library configuration also updates the drive element addressing and drive

numbering. Replacing LTO half height drives with full height drives might require you to run Restore

Factory Defaults to correctly update the drive element addressing and drive numbering. See “Configure

Library: Save/Restore” on page 150.

SCSIElement Slot

257

256

257

256

258

4UUnitwithonlyFHdrives

(1logicallibrary)

4UUnitwithFHandHHdrives

(1logicallibrary)

a77ug165

Figure 222. Examples of SCSI element addressing

290 IBM TS3100 Tape Library and TS3200 Tape Library: Setup, Operator, and Service Guide Machine Type 3573

IBM TS3100 Service Manual

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