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    Re: iSCSI question



    Isn't the error recovery hierarachy based on complexitiy??
    
    * Session recovery(0)- some amount of code
    * Command/PDU recovery(1)- more code than for session recovery
    * Connection recovery(2) - even more code than for Command/PDU recovery
    
    This basis of hierarchy makes negotiation of ErrorRecoveryLevel easier
    between initiators and targets!!
    
    Anshul
    
    ----- Original Message -----
    From: "Shahram Davari" <Shahram_Davari@pmc-sierra.com>
    To: "'Bill Studenmund'" <wrstuden@wasabisystems.com>
    Cc: <pat_thaler@agilent.com>; <Julian_Satran@il.ibm.com>; <ips@ece.cmu.edu>;
    <owner-ips@ece.cmu.edu>
    Sent: Thursday, August 08, 2002 4:21 PM
    Subject: RE: iSCSI question
    
    
    > Hi Bill,
    >
    > Thanks for your reply. Please see my comments below:
    >
    > 1) I doubt that the session re-establishment code is simpler than PDU
    recovery code.
    > But think what you are saying is that, you need to have the session
    recovery anyway, so the PDU recovery is extra code.
    > 2) Even if that is the case, it has nothing to do with the error recovery
    hierarchy.
    > The error recovery hierarchy must show what recovery should be tried
    before the other ones. In other words it has to show how the recovery
    escalates.
    > 3) I think it should escalate as following: PDU -> Connection -> Session
    >
    >
    > Yours,
    > -Shahram
    >
    > > -----Original Message-----
    > > From: Bill Studenmund [mailto:wrstuden@wasabisystems.com]
    > > Sent: Thursday, August 08, 2002 3:59 PM
    > > To: Shahram Davari
    > > Cc: 'pat_thaler@agilent.com'; Julian_Satran@il.ibm.com;
    > > ips@ece.cmu.edu;
    > > owner-ips@ece.cmu.edu
    > > Subject: RE: iSCSI question
    > >
    > >
    > > On Thu, 8 Aug 2002, Shahram Davari wrote:
    > >
    > > > Pat,
    > > >
    > >
    > > > Thanks. I understand your point. Although terminating a
    > > session may be
    > > > easy, but, starting a new session requires new login, parameter
    > > > exchange, new connections establishment, authentication, etc. So I
    > > > wonder how is this any simpler than a simple PDU retransmit?
    > >
    > > It's simpler in terms of the code in both the initiator and target.
    > >
    > > That's how it's simpler. :-)
    > >
    > > Take care,
    > >
    > > Bill
    > >
    
    


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Last updated: Thu Aug 08 17:18:58 2002
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