Task tags in SRP
PJohansson at acm.org
Tue Feb 5 21:25:27 PST 2002
* From the T10 Reflector (t10 at t10.org), posted by:
* Peter Johansson <PJohansson at ACM.org>
At 12:45 PM 2/5/2002 -0800, Gibson, Chuck wrote:
>The task tag is chosen by the host (initiator). It is considered opaque
>to an I/O controller, and is just returned to the host on an I/O
>completion so the host can associate a completed I/O with whatever context
>it is maintaining for the command.
The SRP draft effectively says the following in clause 6.1 succinctly but
perhaps not as directly: The initiator has an obligation NOT to reuse a tag
value until either a) it has received notification of I/O completion for
the task or b) it has certain knowledge that the task has been
aborted---whether by its own actions or another's.
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