FC-TAPE and ABTS from Initiator

Dave Peterson dap at nsco.network.com
Tue Jun 2 12:40:42 PDT 1998


* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* Dave Peterson <dap at nsco.network.com>
*

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Howdy All,

As currently documented (FCP/PLDA) if an ABTS is sent from the SCSI
Initiator the  SCSI Target is supposed to Abort the Exchange (setting
the
LS bit in ACC). There is a case (in FC_TAPE) if running class 2 and the
SCSI Target detects a Sequence error it will return an ACK with the
Abort,
Perform ABTS indication. The SCSI Initiator will send an ABTS. In this
case the SCSI Target will know it has detected a sequence error and
should only Abort the Sequence, not the Exchange. If the SCSI Target
receives an ABTS and has detected no sequence error it will Abort the
Exchange (i.e ULP timeout, explicit Abort, etc...).
Seems like this should work for FC-TAPE.

Comments?

--
===================================================================
Dave Peterson                     phone : 612-391-1008
Senior Engineer
StorageTek Network Systems Group  email: dap at network.com



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 Howdy All, As currently documented (FCP/PLDA) if an ABTS is sent from the SCSI 
Initiator the  SCSI Target is supposed to Abort the Exchange (setting the 
LS bit in ACC). There is a case (in FC_TAPE) if running class 2 and the 
SCSI Target detects a Sequence error it will return an ACK with the Abort, 
Perform ABTS indication. The SCSI Initiator will send an ABTS. In this 
case the SCSI Target will know it has detected a sequence error and 
should only Abort the Sequence, not the Exchange. If the SCSI Target 
receives an ABTS and has detected no sequence error it will Abort the 
Exchange (i.e ULP timeout, explicit Abort, etc...). 
Seems like this should work for FC-TAPE. Comments? -- 
===================================================================
Dave Peterson                     phone : 612-391-1008
Senior Engineer 
StorageTek Network Systems Group  email: dap at network.com  

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