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Re: [Ips] iSCSI: Correct value for ExpDataSN for bidirectional commands

"Mallikarjun C." <cbm@rose.hp.com> Tue, 27 January 2004 18:51 UTC

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Date: Tue, 27 Jan 2004 10:46:43 -0800
From: "Mallikarjun C." <cbm@rose.hp.com>
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To: Ken Sandars <ksandars@elipsan.com>
Cc: ips@ietf.org
Subject: Re: [Ips] iSCSI: Correct value for ExpDataSN for bidirectional commands
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Ken Sandars wrote:

> Hi people,
> 
> Does section 10.4.8 which clearly states that ExpDataSN is "the number
> of Data-In (read) PDUs the target has sent for the command" hold for
> bidirectional commands?

Yes.

> 
> i.e. It's not the number of Data-In and R2T PDUs sent for the command is
> it?

No.  I believe an ExpDataSN mismatch at the initiator
is always interpreted as lost Data-In PDU(s), and could
trigger within-command recovery (appendix E.2.2).
-- 
Mallikarjun

Mallikarjun Chadalapaka
Networked Storage Architecture
Network Storage Solutions
Hewlett-Packard MS 5668
Roseville CA 95747
cbm [at] rose.hp.com


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