linux-kernel - Re: Linux 2.6.29

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Date:	Mon, 30 Mar 2009 16:40:39 -0400
From:	Mark Lord <lkml@....ca>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Jeff Garzik <jeff@...zik.org>, Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ric Wheeler <rwheeler@...hat.com>,
	"Andreas T.Auer" <andreas.t.auer_lkml_73537@...us.ath.cx>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

Jeff Garzik wrote:
> Mark Lord wrote:
>> Michael Tokarev wrote:
>>>
>>> But are there drives out there that actually supports FUA?
>> ..
>>
>> Most (or all?) current model Hitachi Deskstar drives have it.
> 
> Depends on your source of information:  if you judge from probe 
> messages, libata_fua==0 will imply !FUA-support.
..

As your other post points out, lots of drives already support FUA,
but libata deliberately disables it by default (due to the performance
impact, similar to mounting a f/s with -osync).


For the curious, you can use this command to see if your hardware has FUA:

   hdparm -I /dev/sd? | grep FUA

It will show lines like this for the drives that support it:
 
  *    WRITE_{DMA|MULTIPLE}_FUA_EXT

Cheers
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