Re: iSCSI : Digest Error Problems & CmdSN/ExpCmdSN window issues

[Michael Krause <krause@cup.hp.com>]

At 07:40 PM 1/25/2001 +0200, julian_satran@il.ibm.com wrote:


>1) The initiator task tag cannot be trusted when a header digest error
>is seen. What does the phrase "provided it can recognize the initiator
>task tag" mean ?
>How can an initiator reliably claim that the initiator task tag is
>trustworthy ?
>
><js> an initiator may choose to provide some redundancy in the tag itself
></js>

I'm aware of some techniques for inserting redundant information in tags 
which limits the potential error exposure when a multi-bit error occurs, 
however these are not fail-safe leading to potential incorrect operation - 
perhaps benign in many cases; perhaps not in others. As such, if a header 
digest error occurs, the PDU should be silently discarded and recovery 
should be left to the ULP.  There is little to no value having two 
mechanisms to solve the same problem.

Mike