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Re: xfs_force_shutdown after Raid crash

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: xfs_force_shutdown after Raid crash
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 3 Feb 2009 04:32:39 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <200902031022.38583@xxxxxx>
References: <498376CF.8020806@xxxxxxxxxxxxxx> <200902030222.47644@xxxxxx> <4987B673.8030406@xxxxxxxxxxx> <200902031022.38583@xxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
On Tue, Feb 03, 2009 at 10:22:38AM +0100, Michael Monnerie wrote:
> But what about the hard disk cache - should that be disabled? I think in 
> case of a power failure, they just loose their cache contents, right? So 
> the battery-backed controller cache only helps himself, the disks will 
> just throw away up to the 32MB cache they have?

Yes.  I would hope raid controllers disable the write cache on disks,
but for lower end controllers I'm not sure they really do it.

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