IBM Ultrium Internal Tape Drive T200, Reference Manual

Page: 75 / 126

The Valid flag is set if the Information field contains valid information.
The descriptions that follow 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.
The Error Code field is set to 70h to indicate a current error that is associated with
the most recently received command. It is set to 71h to indicate a deferred error
that is not associated with the current command.
The segment number is 0, since the COPY, COMPARE, and COPY and VERIFY
commands are not supported.
The File Mark flag is set if a SPACE, READ, or VERIFY command did not complete
because a file mark was read.
The End of Medium (EOM) flag 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.
The Illegal Length Indicator (ILI) flag 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.
For values of the Sense Key field see “Chapter 4. Sense Keys and Additional
Sense” on page 89.
The Information Bytes are only valid if the Valid flag is set. This occurs only for
current errors and not for deferred errors. See the specific command for details
about when Information Bytes are valid.
The Additional Sense Length is set to n-7, and is at least 10.
The Command Specific Information is set to 0, since no supported commands
define a use for this field.
For supported Additional Sense Codes and Additional Sense Code Qualifiers, see
“Chapter 4. Sense Keys and Additional Sense” on page 89.
The Field Replaceable Unit field is set to 0 or to a non-zero, vendor-specific code
that indicates the part of the drive that is suspected of causing the failure.
The only Sense Key-specific data supported is for Illegal Request (5h). For this
sense key, the Sense Key Specific Valid flag is set and the following fields are set:
v
The Command/Data (C/D) flag is set if the illegal parameter was detected in the
Command Descriptor Block, and is clear if it was detected in the Data phase.
v
If a bit within a byte was invalid, the Bit Pointer Valid (BPV) flag is set and the Bit
Pointer field is set to indicate which bit was in error.
v
The Field Pointer is set to indicate which byte was in error.
The Clean (CLN) flag is set if the drive needs cleaning, and is clear otherwise.
The Dump bit indicates that the drive has a Dump available. The flag is used to
indicate when it is appropriate to read up a dump.
Chapter 2. Command Support
61