Message-ID: <4900C949.6040604@free.fr>
Date: Thu, 23 Oct 2008 20:58:17 +0200
From: matthieu castet <castet.matthieu@free.fr>
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To: Mark Lord <liml@rtr.ca>
CC: Tejun Heo <tj@kernel.org>, David Greaves <david@dgreaves.com>,
       linux-ide@vger.kernel.org,
       Smartmontools Mailing List 
	<smartmontools-support@lists.sourceforge.net>,
       linux-kernel@vger.kernel.org
Subject: Re: [smartmontools-support] SMART to USB/sata dock in 2.6.27-rc5
 doesn't work
References: <48EE7E0A.8040701@dgreaves.com> <48F40164.5000502@kernel.org> <48F641A3.5080609@free.fr> <4900A0A7.3090102@rtr.ca>
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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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