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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iSCSI : Bridging missing CmdSNs and Abort I/O Error recoveryJulian, Could you please clarify if the below issue is going to be addressed in the iSCSI draft, as was discussed earlier. (http://ips.pdl.cs.cmu.edu/mail/msg03155.html). Specifically, is the spec going to address the issue of how initiators can plug a hole in CmdSN sequence when they detect a ULP timeout and/or choose not to use "command retry". Regards, Santosh julian_satran@il.ibm.com wrote: > > Santosh, > > You had a possible answer from Matt. However I agree that we might want to > address this in text although > a solution similar to that suggested by Matt should be by now obvious to > every implementer - the target should leave a placeholder in the input > queue until the command after gets delivered. > > Julo > > Santosh Rao <santoshr@cup.hp.com> on 25/01/2001 21:38:04 > > Please respond to Santosh Rao <santoshr@cup.hp.com> > > To: IPS Reflector <ips@ece.cmu.edu> > cc: > Subject: iSCSI : Bridging missing CmdSNs and Abort I/O Error recovery > > Julian & All, > > The draft is currently lacking a section that addresses abort I/O error > recovery. Specifically, how is CmdSN bridging issues to be handled in > the case where an initiator chooses not to retry an I/O [that failed on > a connection failure that affects the delivery of the command to the > target or a digest error at the target] because its ULP timer may have > expired. > > In such cases, the initiator can send an Abort Task to inform the target > that the I.T.T is being aborted and its corresponding CmdSN can be > bridged, instead of having the target stall infinitely in its attempt to > enforce ordering and await the missing CmdSN [which is'nt going to > arrive, because the initiator did not retry the command]. > > Regards, > Santosh > > - santoshr.vcf begin:vcard n:Rao;Santosh tel;work:408-447-3751 x-mozilla-html:FALSE org:Hewlett Packard, Cupertino.;SISL adr:;;19420, Homestead Road, M\S 43LN, ;Cupertino.;CA.;95014.;USA. version:2.1 email;internet:santoshr@cup.hp.com title:Software Design Engineer x-mozilla-cpt:;21088 fn:Santosh Rao end:vcard
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