Re: iSCSI - Basic Question

[akraslavsky@istor-networks.com]

Joel,

I think the reference is to the length of the entire iSCSI PDU.  Since TCP
is a stream protocol, the fields in the BHS of each iSCSI PDU relating to
length (TotalAHSLength and DataSegmentLength) can be used to establish where
in the TCP stream the subsequent iSCSI PDU will begin.

If the iSCSI header is no good, making the total iSCSI PDU length uncertain,
how can processing continue at the next PDU?

At least I think this is what is being asked...

-- Andrew 

>-- Original Message --
>From: "Joel Evans" <djjoelevans@hotmail.com>
>To: chhavi_garg@indiatimes.com, ips@ece.cmu.edu
>Cc: Julian_Satran@il.ibm.com
>Subject: Re: iSCSI - Basic Question
>Date: Mon, 15 Apr 2002 15:20:17 +0000
>
>
>
>Chhavi,
>
>You mentioned 'packet' length...  Are you referring a length issue with
the
>
>packet, the segment, or the iSCSI payload?  The question is a little 
>ambiguous - from the sound of it, it sounds as though you're asking about
>
>the length of the segment which would be handled by TCP error recovery
-
>in 
>which case, would be resent (no acknowledgement, etc).
>
>Joel
>
>
>>From: "chhavi_garg" <chhavi_garg@indiatimes.com>
>>Reply-To: "chhavi_garg"<chhavi_garg@indiatimes.com>
>>To: <ips@ece.cmu.edu>
>>CC: <Julian_Satran@il.ibm.com>
>>Subject: iSCSI - Basic Question
>>Date: Mon, 15 Apr 2002 19:38:35 +0530
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>>
>>Hi All,
>>
>>
>>Section 6.5 of draft 11-95 says that,
>>
>>
>>"When an initiator receives any iSCSI PDU with a header digest error,
it
>
>>MUST discard the PDU."
>>
>>
>>How will the initiator discard the packet as the packet length itself
may
>
>>be wrong.
>>
>>
>>How can the initiator recover from this condition?
>>
>>
>>Should the initiator close this connection and start connection recovery?
>>
>>
>>-regards,
>>
>>
>>Chhavi.
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