IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive, Specifications

Page: 186 / 228

9.4.1 Unexpected BUS FREE Phase Error Condition
There are several error conditions that will cause the file to immediately change to the BUS F R E E phase,
regardless of the state of the A T N signal. The file 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 L U N was identified by the file prior to the error condition, then the file will abort the active command
for this initiator/LUN and generate sense data for this initiator/LUN to describe the cause of the catastrophic
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 L U N was not identified by the file prior to the error condition, then the file will not affect the sense
data or the operation of any currently executing command for this initiator or any other initiator.
9.4.2 MESSAGE OUT Phase Parity Error
The file will, depending on the model
7
, optionally retry the message phase and if it still fails abort the current
command with C H E C K C O N D I T I O N status and sense data of A B O R T E D C O M M A N D / SCSI
PARITY E R R O R .
9.4.3 MESSAGE IN Phase Parity Error (Message Parity Error)
The file will, depending on the model 7 , optionally retry the message phase and if it still fails abort the current
command, go to bus free, setting sense data of A B O R T E D C O M M A N D / SCSI PARITY E R R O R .
9.4.4 COMMAND Phase Parity Error
The file will, depending on the model
7
, optionally retry the command phase after sending a restore pointers
message. If it still fails it will abort the current command with C H E C K C O N D I T I O N status and sense data
of A B O R T E D C O M M A N D / SCSI PARITY E R R O R .
9.4.5 DATA OUT Phase Parity Error
If the file detects a parity error during DATA O U T phase, the file will abort the current command with
C H E C K C O N D I T I O N status and sense data of A B O R T E D C O M M A N D / SCSI PARITY E R R O R .
7 The action for a particular file model is defined in the interface spec addendum for each model.
176
O E M Spec. of DDRS-3xxxx