Re: iSCSI - Recovery Levels

["Sanjeev Bhagat \(TRIPACE/Zoetermeer\)" <sbhagat@tripace.com>]

Or, it might still be better if some x (eg. 7) value is kept and anything
between 0 and x is reserved. 0 means no recovery and 7 means full recovery.
Once we go thoroughly into dividing the recovery level then the various
reserved values can be defined.

Sanjeev
----- Original Message -----
From: "John Hufferd" <hufferd@us.ibm.com>
To: "Julian Satran" <Julian_Satran@il.ibm.com>
Cc: <ips@ece.cmu.edu>
Sent: Monday, September 03, 2001 9:14 PM
Subject: 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
>
>
>
>