Attention Check Condition from each initiator gets a Check Condition status, with
Unit Attention sense data for the reset. However, other commands may not be
processed until the internal state of the drive has been reset. Any commands that
allow Disconnects and cannot be processed are accepted and queued until the
drive is ready to process them. Those commands that do not allow Disconnects
receive Busy status response.
Abort Handling
If a command is aborted on a drive with a Fibre Channel interface, see Table 110
for abort processing.
If a command is aborted on a drive with a SCSI interface, one of the following
conditions will occur:
v If an abort condition is detected before a command phase completes, the bus is
set to Bus Free and the command is not executed.
v If an abort condition is detected during status phase, the bus is set to bus free.
v If an abort condition is detected between the end of the command phase and the
start of the status phase, then the bus is set to Bus Free and the processing in
Table 110 on page 94 is carried out.
Table 110. Abort Condition Handling
Command Abort Processing
ERASE Long erase is aborted as quickly as possible without
corrupting tape format. Short erase completes.
INQUIRY None.
LOAD/UNLOAD Load completes and logically positions tape at BOM. Unload
is aborted, leaving logical position at BOM unless operation
is past the ‘point of no return’, in which case the tape is
ejected.
LOCATE The logical position is set back to that at the start of the
operation unless the operation is past its ‘point of no return’,
in which case the operation completes.
LOG SELECT If data transfer is completed, command is completed;
otherwise, no action is taken.
LOG SENSE None.
MODE SELECT If data transfer is completed, command is completed;
otherwise, no action is taken.
MODE SENSE None.
PERSISTENT RESERVE IN None.
PERSISTENT RESERVE
OUT
If data transfer is completed, the command is completed;
otherwise, no action is taken.
PREVENT/ALLOW MEDIUM
REMOVAL
The command completes.
READ The current position is set to the first record boundary at or
after the start of the current data burst.
READ ATTRIBUTE None.
READ BLOCK LIMITS None.
READ BUFFER None.
READ POSITION None.
94 Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference
