Unit Attention - Tandberg Data SLR7-140 PROGRAMMER Manual

Tandberg Data
3.4.

Unit Attention

The Unit Attention
initiator whenever
A new cartridge has been inserted
LOG SELECT parameters have been changed by another
Initiator
MODE SELECT parameters have been changed by another
Initiator
The Drive microcode (ucode) has been changed
A hard reset has occurred (either through the SCSI-
bus RST line or through processing of a BUS DEVICE
RESET message)
A power-on reset has occurred
A LOG threshold condition has been met.
The Unit Attention
Initiator until that Initiator clears the condition as
described in the following paragraphs.
If an Initiator issues a command other than INQUIRY or
REQUEST SENSE while a Unit Attention condition exists
for that Initiator (prior to reporting CHECK CONDITION
for the Unit Attention condition), the Drive will not
perform the command
status unless a
(higher priority status) is also pending.
After reporting CHECK CONDITION status, the next command
received from that Initiator should be REQUEST SENSE.
Otherwise the Unit Attention condition will be cleared
for that Initiator, the Drive will perform the command
and report GOOD status.
If a REQUEST SENSE command is received after the Drive
has reported CHECK CONDITION status to this Initiator
for Unit Attention condition, the Drive will report UNIT
ATTENTION Sense Key, and then clear the Unit Attention
condition for that Initiator.
If a REQUEST SENSE command is received from an Initiator
with a pending
Drive reports CHECK CONDITION), the Drive will discard
any pending sense data, report UNIT ATTENTION Sense Key,
and then clear the Unit Attention condition for that
Initiator.
If an INQUIRY command is received with a pending Unit
Attention condition
CONDITION status), the Drive will perform the INQUIRY
command, report GOOD status, and will not clear the Unit
Attention condition. If the INQUIRY command is received
after the Drive
pending Unit Attention
Attention condition
performs the INQUIRY command.
3-11 Tandberg SLR Product Line SCSI Functional Specifications
Condition
Condition will
and will report
BUSY or RESERVATION
Unit Attention
(before the
has reported CHECK
condition,
will be cleared
Logical Characteristics
is created for
persist for
CHECK CONDITION
CONFLICT
condition (before
Drive reports
CONDITION
then the
and the
each
each
status
the
CHECK
for a
Unit
Drive