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Re: Multiple Connections. How would they work?
The 00 draft (Adelaide) had the commands go down over one specific control stream while the data went on any available connection. Synchronizing them and providing for hardware implementation across several adapters was felt to be complex. However command ordering was trivial. The symmetric model in 01 requires ordering and this is why you have the command ordering. A proposal to get back to the asymmetric model but decide ahead of time (? when) what path data will be taking was forwarded by Kalman. We call this the asymmetric model (it can still evolve). I hope this helps. Regards, Julo Robert Snively <rsnively@Brocade.COM> on 06/09/2000 18:46:40 Please respond to Robert Snively <rsnively@Brocade.COM> To: firstname.lastname@example.org cc: (bcc: Julian Satran/Haifa/IBM) Subject: Multiple Connections. How would they work? What am I missing? The reason I felt that iSCSI might possibly work was the text from 2.2.4 of draft-satran-iscsi-01.txt. " For SCSI commands that require data and/or parameter transfer, the (optional) data and the status for a command must be sent over the same TCP connection that was used to deliver the SCSI command (connection allegiance). Thus if an initiator issues a READ command, the target must send the requested data followed by the status to the initiator over the same TCP connection that was used to deliver the SCSI command." >From this, I extrapolated that multiple connections and sessions were mechanisms to manage multiple paths, each of which would carry all the traffic related to a single command, probably with no ordering among them. I had expected TCP/IP and iSCSI state required for execution of an iSCSI operation to be contained within a single NIC. How does this map into the multiple connection structures that are being discussed? How do the multiple connection structures map into the low cost highly efficient hardware assisted NIC implementations that presently typify SCSI implementations?
Last updated: Tue Sep 04 01:07:28 2001
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