IBM TS2900 Setup, Operator, And Service Manual page 241

The descriptions below serve only as an overview of sense reporting in the tape drive. This tape drive
conforms to all sense field reporting as specified in the SCSI standards.
1. The Error Code field (Byte 0) is set to 70h to indicate a current error, that is one associated with the
most recently received command. It is set to 71h to indicate a deferred error which is not associated
with the current command.
2. The segment number (Byte 1) is zero since the Copy, Compare, and Copy and Verify commands are
not supported.
3. The File Mark flag (Byte 2, bit 7) is set if a Space, Read, or Verify command did not complete
because a file mark was read.
4. The End of Media (EOM) flag (Byte 2, bit 6) is set if a Write or Write File Marks command
completed in the early warning area. Spacing into BOM also causes this flag to be set. It is also set
on an attempt to read or space past EOD, or if an attempt is made to space into Beginning of Media.
5. The Illegal Length Indicator (ILI) flag (Byte 2, bit 5) is set if a Read or Verify ended because a block
was read from tape that did not have the block length requested in the command.
6. The Information Bytes (Bytes 3-5) are only valid if the Valid flag is set. This occurs only for current
errors and not for deferred errors.
7. The Field Replaceable Unit field (Byte 14) is set to either zero or to a non-zero, vendor-specific code
indicating which part of the drive is suspected of causing the failure.
8. The Clean (CLN) flag (Byte 21, bit 3) is set if the drive needs cleaning and clear otherwise.
9. The Volume Label Fields Valid (VolValid) bit (Byte 21, bit 0) is set if the Volume Label being reported
is valid.
10. The Volume Label field (Bytes 22-28) reports the volume label if a cartridge is loaded in the drive
and Volume Label Fields Valid is set.
11. The Current Wrap field (Byte 29) reports the physical wrap of the tape. The least significant bit
reflects the current physical direction. A0h means that the current direction is away from the physical
beginning of the tape. A1h means that the current direction is towards the physical beginning of the
tape.
12. Relative LPOS fields (Bytes 30-33) reports the current physical position on the tape.
13. SCSI Address field (Byte 34) reports the SCSI Bus Address for the drive. Values returned range from
00h to 0Fh.
14. This field (Byte 35) contains the frame and drive number, passed across the RS-422 serial interface.
For information, refer to the IBM LTO Ultrium Tape Drive SCSI Reference.
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Appendix D. Sense data