Unit Attention Condition Multiple Hold; Sense Data Hold State; Sense Data Hold Condition; Response And Release Conditions At Sense Data Hold State - Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications

Command Processing
1.5.3

UNIT ATTENTION condition multiple hold

If any UNIT ATTENTION condition is generated and a new UNIT ATTENTION condition is generated
for a different reason before the INIT for which the first UNIT ATTENTION condition was held clears it,
those UNIT ATTENTION conditions are held together, and the IDD reports these multiple UNIT
ATTENTION conditions in sequence.
Synchronized" or "Spindle not Synchronized" or other UNIT ATTENTION condition may be reported
after the "Power on, RESET or TARGET RESET occurred" UNIT ATTENTION condition is reported.
1.6

Sense Data Hold State

1.6.1

Sense data hold condition

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.
Notes:
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.
1.6.2

Response and release conditions at sense data hold state

The response of the IDD when it receives a new command while it is in the sense data hold state, and
conditions for releasing the sense data hold state are shown below.
1-22
For example, a "Mode parameters changed," "Spindle
C141-C010