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Re: XFS and write barrier

To: xfs@xxxxxxxxxxx
Subject: Re: XFS and write barrier
From: Nathan Scott <nathans@xxxxxxx>
Date: Tue, 18 Jul 2006 17:31:22 +1000
Cc: Neil Brown <neilb@xxxxxxx>, linux-raid@xxxxxxxxxxxxxxx
In-reply-to: <20060716173238.GD3417@free.net.ph>; from jijo@free.net.ph on Mon, Jul 17, 2006 at 01:32:38AM +0800
References: <200607151248.56603.Martin@lichtvoll.de> <20060716173238.GD3417@free.net.ph>
Sender: xfs-bounce@xxxxxxxxxxx
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On Mon, Jul 17, 2006 at 01:32:38AM +0800, Federico Sevilla III wrote:
> On Sat, Jul 15, 2006 at 12:48:56PM +0200, Martin Steigerwald wrote:
> > I am currently gathering information to write an article about journal
> > filesystems with emphasis on write barrier functionality, how it
> > works, why journalling filesystems need write barrier and the current
> > implementation of write barrier support for different filesystems.
> Cool! Would you by any chance have information on the interaction
> between journal filesystems with write barrier functionality, and
> software RAID (md)? Based on my experience with 2.6.17, XFS detects that
> the underlying software RAID 1 device does not support barriers and
> therefore disables that functionality.

Noone here seems to know, maybe Neil &| the other folks on linux-raid
can help us out with details on status of MD and write barriers?



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