Re: [storm] Proposed text changes for the connection allocation problem
Michael Ko <mkosjc@gmail.com> Sun, 16 September 2012 17:19 UTC
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Date: Sun, 16 Sep 2012 10:19:39 -0700
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From: Michael Ko <mkosjc@gmail.com>
To: "Black, David" <david.black@emc.com>
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Cc: "storm@ietf.org" <storm@ietf.org>
Subject: Re: [storm] Proposed text changes for the connection allocation problem
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David, I have submiited a new version of the iSER draft incorporating all the latest changes so far, including your recommendations below. I have also reword item #7 in the summary of changes to reflect the new use of the iSERHelloRequired key. Mike On Fri, Sep 14, 2012 at 5:25 PM, Black, David <david.black@emc.com> wrote: > Mike,**** > > ** ** > > I apologize for the delay in getting to this. I think your latest text is > close to what’s**** > > needed, but I want to rewrite the latter part of your second paragraph for > clarity and to**** > > remove a “MUST” that appears easy to misinterpret (IMHO):**** > > ** ** > > OLD**** > > To prevent the potential problem caused by the target sending the > number of**** > > unexpected iSCSI control-type PDUs as determined by the > MaxOustandingUnexpectedPDUs**** > > key allowed in the FullFeaturePhase when "late" connection allocation > is practised,**** > > the iSER Hello exchanges MUST be used. This allows the initiator to > allocate the**** > > connection resources before sending the iSER Hello Messages. The > iSERHelloRequired**** > > key is used by the initiator to determine if it is dealing with a > target that**** > > supports the iSER Hello exchanges.**** > > NEW > An initiator that employs “late” connection allocation may encounter > problems (e.g.,**** > > RCaP connection closure) with a target that sends unexpected iSCSI PDUs > immediately**** > > upon transitioning to Full Feature Phase, as allowed by the negotiated > value of the**** > > the MaxOustandingUnexpectedPDUs key. The only way to prevent this > situation in **** > > full generality is to use iSER Hello Messages, as they enable the > initiator to allocate**** > > its connection resources before sending its iSER Hello Message. The > iSERHelloRequired**** > > key is used by the initiator to determine if it is dealing with a > target that**** > > supports the iSER Hello exchanges. Fortunately, known iSER target > implementations**** > > do not take full advantage of the number of allowed unexpected PDUs > immediately upon**** > > transition into full feature phase, enabling an initiator workaround > that involves**** > > a smaller quantity of connection resources prior to full-feature phase, > as explained**** > > further below.**** > > END**** > > ** ** > > Would you please go ahead and submit a revised version of the draft with > the text changes**** > > that we’ve agreed to. I’ll want to review the changes one more time in > the context of an**** > > entire draft before (finally) sending it to our AD with a request to > publish it as an RFC.**** > > ** ** > > Thank you for your patience with this.**** > > ** ** > > Thanks, > --David**** >
- [storm] Proposed text changes for the connection … Michael Ko
- Re: [storm] Proposed text changes for the connect… Black, David
- Re: [storm] Proposed text changes for the connect… Michael Ko
- Re: [storm] Proposed text changes for the connect… Black, David
- Re: [storm] Proposed text changes for the connect… Michael Ko
- [storm] iSER draft progress! Black, David