REC ELS parameter field
Dale.Lafollette at Sun.COM
Tue Mar 17 10:44:53 PDT 2009
* From the T10 Reflector (t10 at t10.org), posted by:
* Dale LaFollette <Dale.Lafollette at Sun.COM>
Sun T10k drives set REC.LS_ACC.Word5 = 0.
Kevin Jones wrote:
> * From the T10 Reflector (t10 at t10.org), posted by:
> * "Kevin Jones" <kev at bri.hp.com>
> 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 us.ibm.com> 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 us.ibm.com
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