linux-kernel - Re: libata FUA revisited

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Message-id: <45DC51CF.7090202@shaw.ca>
Date:	Wed, 21 Feb 2007 08:06:07 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, edmudama@...il.com,
	Nicolas.Mailhot@...oste.net, Jeff Garzik <jeff@...zik.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mark Lord <mlord@...ox.com>, Ric Wheeler <ric@....com>,
	Dongjun Shin <d.j.shin@...sung.com>,
	Hannes Reinecke <hare@...e.de>
Subject: Re: libata FUA revisited

Tejun Heo wrote:
>> Aside from the issue above, as I mentioned elsewhere, lots of NCQ drives
>> don't support non-NCQ FUA writes..
> 
> To me, using the NCQ FUA bit on such drives doesn't seem to be a good
> idea.  Maybe I'm just too chicken but it's not like we can gain a lot
> from doing FUA at this point.  Are there a lot of drives which support
> NCQ but not FUA opcodes?

Well, it's hard to say whether "lots" have this issue, but the ones I 
have in my machine, Seagate 7200.7 NCQ 160GB (ST3160827AS) and 7200.10 
320GB (ST3320620AS), both support NCQ and don't support non-NCQ FUA, and 
those (especially the latter) seem to be very popular models.

Likely Seagate didn't implement that command since they figured nobody 
would use that if they had NCQ..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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