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    Re: iSCSI - Recovery Levels



    
    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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Last updated: Tue Sep 04 01:03:48 2001
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