iSCSI:SCSI Mode Pages

Sanjeev Bhagat (TRIPACE/Zoetermeer) iscsi_t10 at sanjeevbhagat.com
Tue Sep 18 11:30:03 PDT 2001


* From the T10 Reflector (t10 at t10.org), posted by:
* "Sanjeev Bhagat \(TRIPACE/Zoetermeer\)" <iscsi_t10 at sanjeevbhagat.com>
*
I have a query regarding section 3.1.2 EMDP mode parameter. Current text
says

3.1.2 E - Enable Modify Data Pointers Bit (EMDP)


......

If EMDP is set to 1, Data PDU sequences may be transferred in any order. If
EMDP is set to 0, Data PDU sequences MUST be transferred using continuously
increasing offsets.


Does this line mean that if EMDP=1 the out of order received data PDUs by
the iSCSI target be transferred directly to the actual SCSI LU (say a HDD)

or

does it mean that the if EMDP=1 the out of order received data PDUs be
stored in some external buffer provided by SCSI LU and re-assembled and
ordered there before transferring it into the SCSI LU.

Regards,

Sanjeev


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