Scsi Bus Related Error Handling Protocol; Unexpected Bus Free Phase Error Condition; Message Out Phase Parity Error; Message In Phase Parity Error (Message Parity Error) - IBM Ultrastar 36LZX Specifications

10.4 SCSI Bus Related Error Handling Protocol

This protocol is used to handle errors that threaten the integrity of a connection between the Target and
an Initiator.

10.4.1 Unexpected BUS FREE Phase Error Condition

There are several error conditions that will cause the drive to immediately change to the BUS FREE
phase regardless of the state of the ATN signal. The drive will not attempt to reconnect to the initiator to
complete the operation that was in progress when the error condition was detected. The initiator should
interpret this as a catastrophic error condition.
If the LUN was identified by the drive prior to the error condition, the drive will abort the active command
for this initiator/LUN and generate sense data for this initiator/LUN to describe the cause of the cata-
strophic error. The initiator may retrieve this sense data by issuing a REQUEST SENSE command to
this LUN. Note however, that the REQUEST SENSE command may fail if the catastrophic error
condition persists.
If the LUN was not identified by the drive prior to the error condition, the drive will not affect the sense
data or the operation of any currently executing command for this initiator or any other initiator.

10.4.2 MESSAGE OUT Phase Parity Error

Depending on the model
current command with CHECK CONDITION status and sense data of ABORTED COMMAND / SCSI
PARITY ERROR.

10.4.3 MESSAGE IN Phase Parity Error (Message Parity Error)

Depending on the model
command and go to bus free, setting sense data of ABORTED COMMAND / SCSI PARITY ERROR.

10.4.4 COMMAND Phase Parity Error

Depending on the model
message. If it still fails, it will abort the current command with CHECK CONDITION status and sense
data of ABORTED COMMAND / SCSI PARITY ERROR.

10.4.5 DATA OUT Phase Parity Error

If the drive detects a parity error during DATA OUT phase, the drive will abort the current command with
CHECK CONDITION status and sense data of ABORTED COMMAND / SCSI PARITY ERROR.
7
The action for a particular file model is defined in the optional customized interface spec addendum for each
model.
8
The action for a particular file model is defined in the optional customized interface spec addendum for each
model.
9
The action for a particular file model is defined in the optional customized interface spec addendum for each
model.
7
the drive will optionally retry the message phase and, if it still fails, abort the
8
the drive may retry the message phase and, if it still fails, abort the current
9
the drive may retry the command phase after sending a restore pointers
Ultrastar 36LZX hard disk drive specifications
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