linux-kernel - Re: [smartmontools-support] SMART to USB/sata dock in 2.6.27-rc5 doesn't work

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Message-ID: <4900C949.6040604@free.fr>
Date:	Thu, 23 Oct 2008 20:58:17 +0200
From:	matthieu castet <castet.matthieu@...e.fr>
To:	Mark Lord <liml@....ca>
CC:	Tejun Heo <tj@...nel.org>, David Greaves <david@...eaves.com>,
	linux-ide@...r.kernel.org,
	Smartmontools Mailing List 
	<smartmontools-support@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [smartmontools-support] SMART to USB/sata dock in 2.6.27-rc5
 doesn't work

Mark Lord wrote:
> matthieu castet wrote:
>> Hi,
>>
>> Tejun Heo wrote:
>>> David Greaves wrote:
>>>> Error Counter logging not supported
>>>> Device does not support Self Test logging
>>>
>>> The USB bridge should support SAT (SCSI-ATA translation) and many
>>> don't.  Nothing much can be done about it.  The hardware just don't know
>>> how to do it.
>>>
>> That true that the hardware should support SAT, but even if it support 
>> it, linux need some patches to support SAT over USB. See 
>> http://thread.gmane.org/gmane.linux.scsi/43688 and the patch mentioned 
>> in the thread.
> ...
> 
> Ahh.. Great!  This mostly fixes smartctl operation on at least two
> of my USB drive enclosures here:
> 
>    1. a recent rev.  2.5" NexStar-3 SATA enclosure.
>    2. a 250GB 2.5" WD "Passport" external USB drive/enclosure.
> 
> With the patch, this command line works for me:
> 
>    smartctl -a -dsat -T permissive /dev/sdb
> And hdparm just works regardless, with or without the patch.
> 
> 
It should work without permissive, permissive was need without the patch.

You said hdparm works without the patch. I wonder how it work. IRRC it 
asks check condition stuff for every command. I am interested to see the 
hdparm --verbose output without the patch.


BTW somebody is trying to push a patch similar to this one to 
usb-storage driver : 
https://lists.one-eyed-alien.net/pipermail/usb-storage/2008-October/004096.html


Matthieu
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