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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: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Mon, 02 Feb 2009 21:13:55 -0600
Cc: xfs@xxxxxxxxxxx
In-reply-to: <200902030222.47644@xxxxxx>
References: <498376CF.8020806@xxxxxxxxxxxxxx> <20090131105712.GA30061@xxxxxxxxxxxxx> <200902030222.47644@xxxxxx>
User-agent: Thunderbird 2.0.0.19 (Macintosh/20081209)
Michael Monnerie wrote:
> On Samstag 31 Januar 2009 Christoph Hellwig wrote:
>> This looks like you were running with a write back cache enabled on
>> the controller / disks but without barriers.
> 
> I've read that this is dangerous. How can I tell if I suffer the same? I 
> use an Areca 1680 SAS RAID Controller with 2GB Cache, so there could be 
> a lot of writes in it.
> 
> mfg zmi

you'd need to read the docs for your controller, to find out how to tell
if it has a writeback cache enabled, and whether it is batter-backed or not.

-Eric

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