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

[julian_satran@il.ibm.com]

64 bit tags - that is a bit bloated.

Will have to look into it and consider has strong the mandate is.

I assume people where thinking of using addresses as tags.

Julo

Raghavendra Rao <jp.raghavendra@sun.com> on 09/01/2001 21:18:49

Please respond to Raghavendra Rao <jp.raghavendra@sun.com>

To:   ips@ece.cmu.edu
cc:
Subject:  Re: iSCSI : On the subject of R2T and Task Tags.





> 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