REC ELS parameter field

Kevin Jones kev at
Tue Mar 17 08:18:52 PDT 2009

* From the T10 Reflector (t10 at, posted by:
* "Kevin Jones" <kev at>
I'm confused.
Are we talking about to REC.LS_ACC.Word5 (Frame header parameter)
or REC.LS_ACC.Word10 (Frame Payload FC4VALUE) see FCP4 section 6.5 ?
HP LTO drives set REC.LS_ACC.Word5 = 0.
HP LTO drives set REC.LS_ACC.Word10 = bytes read/written.
Kevin Jones
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On Tue, 17 Mar 2009 14:23:52 -0000, Kevin D Butt <kdbutt at> wrote:
> In response to the question sent on the reflector:
> FCP-4 folks: FC-LS requires that ?The value of the Parameter field in the
> Frame_Header of an REC ELS and an LS_ACC in response to an REC ELS shall
> be specified by the FC-4 that sends the frame.? FCP-4 specifies the value
> of the Parameter field for the ELS but not for the LS_ACC.
>What do people actually do for the LS_ACC? Is it consistent enough to say
> something in FCP-4?
> The parameter field of LS_ACC is the same as the parameter field of REC
> ELS, unless an error occurs internal to the tape drive which requires the
> entire command to be redriven.  In that case, the parameter field of the
> LS_ACC is set to zero to indicate an FCP_RO of zero.	The intent is for
> the initiator port to discard any previously received data and redrive the
> command by sending an SRR with a relative offset of zero.
> Kevin D. Butt
> SCSI & Fibre Channel Architect, Tape Firmware
> MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
> Tel: 520-799-5280
> Fax: 520-799-2723 (T/L:321)
> Email address: kdbutt at
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