SORT BY:

LIST ORDER
THREAD
AUTHOR
SUBJECT


SEARCH

IPS HOME


    [Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

    RE: iSCSI: Use of the A bit



    Yes, I agree.
    
    Eddy
    
    -----Original Message-----
    From: Mallikarjun C. [mailto:cbm@rose.hp.com]
    Sent: Friday, March 15, 2002 11:22 PM
    To: ips@ece.cmu.edu
    Subject: Re: iSCSI: Use of the A bit
    
    
    I agree with Julian.
    
    Seems to me that targets should be allowed to ask for an ack
    on the last Data-In PDU that concludes the entire transfer for the
    task - a follow-up NOP-ping is needless.  I propose that we
    
    replace:
      "it MAY set the A bit to 1 only once every MaxBurstSize bytes and MUST NOT
    do so more frequently than this."
    
    with:
      "it MAY set the A bit to 1 only once every MaxBurstSize bytes or on the
    last
       Data-In PDU that concludes the entire requested transfer from the
    target's
       perspective, and MUST NOT do so more frequently than this."
    --
    Mallikarjun
    
    Mallikarjun Chadalapaka
    Networked Storage Architecture
    Network Storage Solutions Organization
    Hewlett-Packard MS 5668
    Roseville CA 95747
    cbm@rose.hp.com
    
    ----- Original Message -----
    From: "Julian Satran" <Julian_Satran@il.ibm.com>
    To: "Paul Koning" <ni1d@arrl.net>
    Cc: <Eddy_Quicksall@ivivity.com>; <ips@ece.cmu.edu>;
    <owner-ips@ece.cmu.edu>; <rod.harrison@windriver.com>
    Sent: Friday, March 15, 2002 11:50 AM
    Subject: RE: iSCSI: Use of the A bit
    
    
    > That could be so but it would be overkill. Status ACK can implicitly
    > acknowledge the last transfer.
    > And Yes the fact that the last transfer is not mentioned is an oversight
    > that I will correct.
    > This does not mean that you HAVE TO raise the A flag or that you are
    > ENCOURAGED to do so :-)
    >
    > Julo
    >
    >
    >
    >
    > Paul Koning <ni1d@arrl.net>
    > Sent by: owner-ips@ece.cmu.edu
    > 15-03-02 16:09
    > Please respond to Paul Koning
    >
    >
    >         To:     Eddy_Quicksall@ivivity.com
    >         cc:     rod.harrison@windriver.com, ips@ece.cmu.edu
    >         Subject:        RE: iSCSI: Use of the A bit
    >
    >
    >
    > >>>>> "Eddy" == Eddy Quicksall <Eddy_Quicksall@ivivity.com> writes:
    >
    >  Eddy> I think we may need better explanation about why some folks
    >  Eddy> don't want to do the "positive ack".
    >
    >  >> We got to this position, since so many folks did not want to
    >  >> support the positive ack.
    >
    > Something doesn't compute here.
    >
    > I don't believe the discussion has anything to do with whether you
    > support positive ACK or not.  If you're doing error recovery level 1
    > or above, then you are required to support it, because the other end
    > is allowed to say A=1 and you're required to answer that.
    >
    > If you don't want to support positive ACK, the solution is to support
    > only error recovery level 0.
    >
    > The issue under discussion is whether the rule "you are allowed to set
    > A=1 only once per MaxBurstSize" is correct.  At this point it's clear
    > to me that it is not, because you need to be able to set A=1 at the
    > end of the transfer.  The current rule forbids that unless the total
    > transfer size is >= MaxBurstSize.
    >
    > Kevin's proposal is a simple fix to this problem.
    >
    >                   paul
    >
    >
    >
    >
    


Home

Last updated: Sat Mar 16 11:18:14 2002
9153 messages in chronological order