Re: iSCSI: DataRN

[Santosh Rao <santoshr@cup.hp.com>]

julian_satran@il.ibm.com wrote:

>
> The above is correct if the digest error or connection failure occurred on
> delivery of the command. If a digest error were to be detected by an
> initiator on the response PDU (by which time the target has already
> completed the operation and the TCP layer at the initiator has already
> sent the ACK), then, the command is complete from the device perspective
> and should not be retried.
>
> <js> how would that happen ? </js>

Julian,

If the initiator detected a digest error on the Response PDU[and the target
has completed all or part of the data phase], such an operation cannot be
retried without a prior rewind command, in the case of sequential media.

The iSCSI layer cannot retry commands destined to sequential media when there
is a possibility that some or all of the data phase is complete.

Regards,
Santosh
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