Quantum ATL PowerStor L200 Series, User Manual

Page: 73 / 106

Chapter 4 SCSI Interface
SCSI Message System
ATL PowerStor L200 Series Library User’s Guide 57
Abort (06h)
4
The initiator sends an abort message to the target to clear the current
I/O process on the selected unit. The target goes directly to the
BUS
FREE
phase after successful receipt of this message. Current settings of
Mode Select parameters and reservations are not affected. Commands,
data, and status for other initiators are not affected.
This message can be sent to a logical unit that is not currently
performing an operation for the initiator. If no unit has been selected,
the target goes to
BUS FREE
and no commands, data, or status on the
target are affected.
Abort Tag (0Dh)
4
This message is sent from the initiator to the target to clear the current
I/O operation only, on the selected unit. The target goes directly to the
BUS FREE
phase after successful receipt of this message. Current
settings of Mode Select parameters and reservations are not affected.
Bus Device Reset
(0Ch)
4
This message from an initiator clears all commands, data, and status in
the library.
Clear Queue (0Eh)
4
This message clears all I/O processes for all initiators. A Unit
Attention condition is generated for all other initiators that had
outstanding I/O processes, with Additional Sense Code (ASC) of
Command Cleared by Another Initiator. The target goes directly to the
BUS FREE
phase after successful receipt of this message. Current
settings of Mode Select parameters and reservations are not affected.
No-Op (No
Operation)
08h Out
Restore Pointers
03h In
Save Data
Pointer
02h In
Synchronous Data
Transfer Request
see page 61
Wide Data
Transfer Request
03h In
Message
Operation
Code
In/Out