IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications page 191

Queue Full Status is returned
Busy Status is returned
If an active I/O process does exist when the Target receives a new command, then the Target determines
how the new command should be handled based on the following rules:
Check Condition Status is returned with Sense Key set to Aborted Command for an Overlapped Com-
mands Attempted error if:
See 10.1.3, "Incorrect Initiator Connection" on page 180
the command is permitted to execute if
the command is an Inquiry or Request Sense command
Check Condition Status is returned with Sense Key set to Logical Unit Not Ready if:
the start-up operation or format operation is an active process.
the command is permitted to execute if
the conditions to execute concurrently are met. (See 10.5, "Concurrent I/O Process" on page 189)
the command is added to the command queue for an I_T_L nexus if:
no Queue Tag message was received during the connection which
established the I/O process,and
disconnection is allowed for the current I/O process, and
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, and
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:
a Queue Tag message was received during the connection which
established the I/O process, and
Tagged Queuing is enabled(DQue = 0), and
an I/O process(either active or queued) exists at the Target for this
Initiator, and
disconnection is allowed for the current I/O process, and
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 process, and
the command is not linked to a previous command.
Queue Full Status is returned if:
the command would otherwise be queued (according to the rules described
above) but the command queue is full and all slots are utilized, or
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, or
Tagged Queuing is enabled(DQue = 0) and a Format Unit command was
previously queued but has not yet begun execution, or
Tagged Queuing is enabled(DQue = 0) and a Start Unit command was
previously queued but has not yet begun execution.
Busy Status is returned if:
Tagged Queuing is disabled(DQue = 1) and a Format Unit command was
previously queued but has not yet begun execution, or
Tagged Queuing is disabled(DQue = 1) and a Start Unit command was
previously queued but has not yet begun execution, or
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