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In this Document

Goal

Solution

Applies to:

Goal

 T10000/9840 - How to Read SCSI Sense Information

Solution

9x40 and T10000 SCSI Sense Data

Details from the T10000 Fibre Channel Reference PN E20425. Link to manual

Go to the Commands chapter.
Go to the Request Sense command breakdown in this chapter.
Look at the Sense Data breakdown.
Note the following bytes:
Byte 2 - lower half contains the Sense Key
Byte 12 - contains the ASC
Byte 13 - contains the ASCQ
Bytes 18 to 23 - FSCs (may not be present)

Consult table 3-147 and find the Sense Key/ASC/ASCQ combination from the sense to get a description of the problem.

Use the following error message as an example:

07/11/13 11:21:13 ANR8302E I/O error on drive T10KDRV25 (/dev/mt27) with

volume 956802 (OP=SETMODE, Error Number=22, CC=207, rc =
1, KEY= 05, ASC=1A, ASCQ= 00,
SENSE=70.00.05.00.00.00.00.12.00.00.00.00.1A.00.00.00.00-
.00.00.00.00.00.00.00.18.02., Description=Device is not in a state capable of performing request). Refer to the Tivoli Storage Manager documentation on I/O error code descriptions. (SESSION: 11911, PROCESS: 16)

In the example above, we have Sense Key = 5, ASC = 1A, ASCQ = 00. if you look this up in the table it states: Parameter list length error (mode select or other parameter data was truncated)

Note - in this case no FSC information is available. Bytes 18 - 23 are zero's.

LTO Sense Data

The above example shows one of the formats of LTO drive errors in system logs. I tend to locate these errors as above eg. Find asc. These 2x errors are on the same drive the first one 3/0C/OO is a write perm. This entry appeared only once as it is pointless trying to recover from a write perm.

The 2nd error (3/11/00) is a read perm this error appeared 7x times in the log as the host is doing its best to recover the data from this permanent error. After 7x attempts the system gives up. The drive too would have been trying to recover this error itself, by re-reading the block, varying the read amp gains etc. (all code dependent) before admitting to the host that it had given up, the host then said try again. (7 times)
Tape Library F/C (SCSI) Sense Key Strings

This document contains full description of all Sense Keys meanings, which can be helpful to analyze Customer issue.

Tape Library F/C (SCSI) Sense Key Strings

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