Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
229
- no Queue Tag message was received during the connection which established the I/O process
- disconnection is allowed for the current I/O process
- there is no queued I/O process or active I/O process corresponding to the I_T_L nexus for the current I/O process
- the command is not linked to a previous command
•
the command is added to the command queue for an I_T_L_Q nexus if the following conditions exist:
- a Queue Tag message was received during the connection which established the I/O process
- Tagged Queuing is enabled (DQue = 0)
- an I/O process (either active or queued) exists at the Target for this Initiator
- disconnection is allowed for the current I/O process
- there is no queued I/O process or active I/O process corresponding to the I_T_L_Q nexus for the current I/O pro-
cess
- the command is not linked to a previous command.
•
Queue Full Status is returned if any one of the following conditions exists:
- the command would otherwise be queued (according to the rules described above) but the command queue is full
and all slots are utilized
- the command would otherwise be queued (according to the rules described above) but all of the available command
queue slots not reserved for use by another initiator are utilized
- Tagged Queuing is enabled (DQue = 0) and a Format Unit command was previously queued but has not yet begun
execution
- Tagged Queuing is enabled (DQue = 0) and a Unit start command was previously queued but has not yet begun
execution
•
Busy Status is returned if any of the following conditions exists:
- Tagged Queuing is disabled (DQue = 1) and a Format Unit command was previously queued but has not yet begun
execution
- Tagged Queuing is disabled (DQue = 1) and a Unit start command was previously queued but has not yet begun
execution
- the command would otherwise be queued (according to the rules described above) but disconnection is not allowed
for the current I/O process.
If a command is queued, command execution may still be prevented at a later time when the command is dequeued to become
an active I/O process. This occurs if command execution is prevented at the time the command is dequeued by another internal
Target condition listed in Section 20.1.1, “Priority of SCSI Status Byte Reporting” on page 227.
Summary of Contents for HUS151414VL3600
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