Determining application client support for CRN.
santoshr at cup.hp.com
Mon Sep 24 17:56:55 PDT 2001
* From the T10 Reflector (t10 at t10.org), posted by:
* Santosh Rao <santoshr at cup.hp.com>
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I've got some questions on the CRN field as defined in SAM-2 Rev 20
Section 5.1 and the EPDC bit in the LUN Control Mode Page in FCP-2. Your
responses would be much appreciated.
* Is the CRN support capability of the application client to be
assumed by the device server ? If not, is'nt a bit required in the
"Control Mode Page" or some other ULP specific mode page to test
for CRN support at the device server ?
* What is the intent of the EPDC( Enable Precise Delivery Checking)
bit in the LUN Control Mode Page in FCP-2 ? I assume this is meant
to test for the CRN support at the target FCP layer [since
FCP implementations would treat the CRN byte as reserved in the
FCP_CMD IU]. I assume this is NOT meant to verify the application
client support, is that correct ?
* Is there any need for new SCSI transports to have a bit similar to
the EPDC bit of FCP-2, if they are guaranteed to support the CRN
field in their SCSI Command encapsulation IUs from their initial
revs ? I ask this in the context of iscsi. I also noticed that SRP
has chosen not to define the Protocol Specific LUN Page [which
would have contained something equivalent to the EPDC bit].
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