Re: iSCSI : On the subject of R2T and Task Tags.

[Raghavendra Rao <jp.raghavendra@sun.com>]

> Since a READ Data PDU has no Target Task Tag, is it the expectation that
> iSCSI targets should perform a lookup on the Initiator Task Tag to obtain
> their per-task data structure ? This is a performance penalty, if so.
> 

For a SCSI READ command, I don't think it'll be really useful to have a target
task tag.

> Again, with WRITE Data PDUs there is no target assigned
> per-task tag. While one could argue about vertically encoding the Target

There is - this is done during R2T time and every solicited data PDU
from the initiator goes out with this tag.

BTW, SAM-2 rev 14 has 64 bit task tags; How are we handling situations
like these ?

-JP