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Re: recovery failed after power off

To: Stephen Lord <lord@xxxxxxx>
Subject: Re: recovery failed after power off
From: Christian Thalinger <twisti@xxxxxxxxxxxxxxxxxxxxx>
Date: 02 Aug 2002 14:19:28 +0200
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <1028167048.1122.7.camel@xxxxxxxxxxxxxxxxxxxxxxx>
References: <1028154195.816.10.camel@xxxxxxxxxxxxxxxx> <1028167048.1122.7.camel@xxxxxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
On Thu, 2002-08-01 at 03:57, Stephen Lord wrote:
> So are you running IDE with write caching turned on? Any journaled
> filesystem is going to have issues with a write cache enabled
> drive if you drop the power on it. In order to work a journaled
> file system has ordering constraints between log writes and 
> metadata writes. A drive write cache can cause these constraints
> to be broken - a metadata write was probably still in cache and
> the relevant log space was overwritten on disk.
> 
> Steve
> 

Yep, IDE drive with write cache. Sorry, i could guess it myself. Without
write cache recovery seems to be ok. Now i have to find out how to
disable write cache of IDE drives on a 3ware controller ;-)

Regards.


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