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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iSCSI - Recovery LevelsJohn, It is only a placeholder - I will put in a TBD there too! Julo John Hufferd@IBMUS 03-09-2001 22:14 To: Julian Satran/Haifa/IBM@IBMIL cc: ips@ece.cmu.edu From: John Hufferd/San Jose/IBM@IBMUS Subject: Re: iSCSI - Recovery Levels (Document link: Julian Satran - Mail) Julian, The way you have written it, only two levels can be specified, since level one contains all the currently know levels. Perhaps, you need to leave some space between Zero and Everything currently known, by assigning Everything to be number 2, or, 3 etc. If we define it to be the number 2 for instance then it is possible that we only define 0 and 2 but it would leave room for a 1 if one was defined. . . . John L. Hufferd Senior Technical Staff Member (STSM) IBM/SSG San Jose Ca Main Office (408) 256-0403, Tie: 276-0403, eFax: (408) 904-4688 Home Office (408) 997-6136 Internet address: hufferd@us.ibm.com Julian Satran/Haifa/IBM@IBMIL@ece.cmu.edu on 09/03/2001 06:59:38 AM Sent by: owner-ips@ece.cmu.edu To: ips@ece.cmu.edu cc: Subject: iSCSI - Recovery Levels There seems to be consensus around the fact the recovery leves are good and no clear consensus about hpow many should there be (2 or 3). As there is no chance to settle this until 08 gets out I suggest intrdocucing a generic key=value pair (RecoveryLevel) and remove the existing keys (CommmandFailoverSupport and CommandReplaySupport). RecoveryLevel will be defined as follows: 01 RecoveryLevel Use: LO Who can send: Initiator and Target RecoveryLevel=<0 to x> Default is 0. Initiator and target negotiate the recovery level supported. The minimum of the two values is selected. Recovery levels represent a combination of recovery capabilities. Each recovery level includes all the capabilities of the lower recovery levels and adds to them some new ones. In the recovery mechanisms descriptions some specific recovery capabilities are used. Those are mapped to levels as follows: 0 - SessionRecovery 1 - CommandFailoverSupport and CommandReplaySupport [TBD] Comments? Julo
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