2.8 Command Processing Exceptions
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The start of execution timing for this automatic readjustment
operation is ordinarily impossible for the INIT to predict. The
automatic readjustment operation is performed when there is no
command being executed or waiting in the queue, but execution of
commands issued immediately after the HDD starts a readjustment
operation is caused to wait until the readjustment operation is
completed.
2.8.5 Abort processing Abort measures which can be performed by the INIT are as shown below.
• HARD RESET
• LOGICAL UNIT RESET
• CLEAR TASK SET
• ABORT TASK SET
• ABORT TASK
Table 2.9 Comparison between SAS and SCSI about definition
Definition by SAS Definition by SCSI
HARD RESET Comparable to SRST
LOGICAL UNIT RESET Bus Device Reset Message
CLEAR TASK SET Clear Task Set Message
ABORT TASK SET Abort Task Set Message
ABORT TASK Abort Task Message
Each abort processing operation performs abort processing for the specified
nexus.
• Nexus
• I: INIT
• T: TARG
• L: Logical unit
• Q: Queue tag
Each processing operation is outlined as follows: