Fujitsu MAN3367 User Manual

C141-E124-01EN

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The IDD generates sense data if any of the following conditions occurs and enters the sense data
hold state until the conditions for cancellation, described in Section 1.6.2, are established.  The
sense data which are generated, are held for each individual INIT that issued the applicable
command.  The sense data hold state is also maintained individually for each INIT which is their
object.

1) If the IDD reports a CHECK CONDITION status, sense data is generated  for the command

that was terminated by the CHECK CONDITION status.

2) If a fatal error occurs on the SCSI bus and the IDD forcibly enters the BUS FREE phase, sense

data is generated for the command that was being executed on the SCSI bus.  However, if the
LUN cannot be identified by the point when the error occurs, the IDD does not generate sense
data.

3) Since it is impossible for reconnection processing to be executed without a response from the

INIT in the RESELECTION phase, if the IDD clears the command that is necessary for
reconnection processing, sense data is generated for that command.

1.

In the case of 3) above, the IDD does not clearly inform the INIT of the occurrence of an
error, but terminates the command abnormally and enters the sense data hold state.  If a
long period of time passes with no response from the IDD, the INIT that issued the
command should issue a REQUEST SENSE command and confirm the content of the
error.

2.

If the INIT which is the object of holding of sense data cannot be identified because the
INIT’s SCSI ID was not notified in the SELECTION phase, the INIT enters an
unspecified special sense data hold state.  In this case, the IDD regards this as the INIT
that is the object of holding of the sense data starting a new SELECTION phase in which
the INIT’s SCSI ID is not notified.