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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: iSCSI: same ISIDThanks, John cleared it up for me ... I misunderstood the intent. Eddy -----Original Message----- From: Santosh Rao [mailto:santoshr@cup.hp.com] Sent: Thursday, December 20, 2001 3:41 PM To: Eddy Quicksall Cc: ips@ece. cmu. edu (E-mail) Subject: Re: iSCSI: same ISID Eddy, I am opposed to the suggestion that "conservative re-use" of ISIDs be made a MUST. THis is really only required when initiators need to be using the new T10 Reservation scheme that can be shared across initiator ports. For those initiators that don't care about this type of reservation, conservative re-use is of no use and initiators may like to assign ISID's in a per-initiator node fashion, thereby, being able to use these ISIDs as a lookup index for the sessions on that initiator node. Hence, I suggest that "conservative re-use" be worded as "encouraged to use" or something to that effect, but not MUST USE. Comments ? Regards, Santosh ------------------------------------------------------------------------ -------- Subject: iSCSI: same ISID Date: Thu, 20 Dec 2001 13:39:27 -0500 From: "Eddy Quicksall" <Eddy_Quicksall@ivivity.com> To: "ips@ece. cmu. edu (E-mail)" <ips@ece.cmu.edu> Section 9.1.1 says: the same ISID should be used in the Login process to multiple target portal groups (of the same iSCSI Target or different iSCSI Targets). Note that the ISID RULE (2.5.3) only prohibits reuse to the same target portal group. It also does not "preclude" reuse to other target portal groups. The principle of conservative reuse "encourages" reuse to other target portal groups. When a SCSI target device sees the same (InitiatorName, ISID) pair in different sessions to different target portal groups, it can identify the underlying SCSI Initiator Port on each session as the same SCSI port (in effect, it can recognize multiple paths from the same source). This is good but the target will still have to sort out ISID's when they are different under the same situations named above. So, since the target still has to have all the code to sort this out, what good is this statement? I think the only thing keeping us from saying you MUST use the same ISID's is the fact that we have allowed an iSCSI Initiator to have more than one session to the iSCSI Target Portal Group. Is that really necessary? If not, then we could make this a MUST and simplify the target code. Eddy -- ################################## Santosh Rao Software Design Engineer, HP-UX iSCSI Driver Team, Hewlett Packard, Cupertino. email : santoshr@cup.hp.com Phone : 408-447-3751 ##################################
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