From: Boaz Harrosh <bharrosh@panasas.com>
To: dougg@torque.net
Cc: Alan Stern <stern@rowland.harvard.edu>,
USB Storage list <usb-storage@lists.one-eyed-alien.net>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
Matthieu castet <castet.matthieu@free.fr>
Subject: Re: [usb-storage] USB storage devices and SAT
Date: Tue, 05 Aug 2008 19:09:48 +0300 [thread overview]
Message-ID: <48987B4C.7020901@panasas.com> (raw)
In-Reply-To: <48987856.9030804@panasas.com>
Boaz Harrosh wrote:
> Douglas Gilbert wrote:
>> The "correct" maximum value (SPC-3 and draft SPC-4) is 252.
>> Since SPC-3 the recommended maximum length for the basic
>> SCSI commands that have a 1 byte allocation length field was
>> altered from 255 to 252. This is to be a little friendlier
>> to transports that move data in 4 byte units across their
>> transport. Guessing a bit here but SATA, SAS and FCP fall
>> into that group of transports.
>
> 252 + 8 bytes header for REQUEST_SENSE command. So total
> 260 buffer size. (Last I look)
>
OK you are right 252 allocation length max, specified at
REQUEST_SENSE CDB. The sense_buffer structure itself has
252 + 8 restriction which got me confused. In OSD we
have large sense payload that can get truncated by these
values.
Boaz
next prev parent reply other threads:[~2008-08-05 16:10 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-04 1:10 USB storage devices and SAT Douglas Gilbert
2008-08-04 1:33 ` James Bottomley
2008-08-04 2:18 ` [usb-storage] " Matthew Dharm
2008-08-04 2:21 ` Matthew Dharm
2008-08-04 8:31 ` Boaz Harrosh
2008-08-04 15:21 ` Matthew Dharm
2008-08-04 15:51 ` Alan Stern
2008-08-04 17:45 ` [usb-storage] " Matthew Dharm
2008-08-05 11:54 ` Boaz Harrosh
2008-08-05 14:51 ` Alan Stern
2008-08-05 15:10 ` Boaz Harrosh
2008-08-05 15:34 ` Douglas Gilbert
2008-08-05 15:57 ` Boaz Harrosh
2008-08-05 16:09 ` Boaz Harrosh [this message]
2008-08-05 17:42 ` matthieu castet
2008-09-07 19:35 ` matthieu castet
2008-09-08 7:27 ` Boaz Harrosh
-- strict thread matches above, loose matches on Subject: below --
2008-08-04 10:08 castet.matthieu
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