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Re: mount: Structure needs cleaning

To: xfs@xxxxxxxxxxx
Subject: Re: mount: Structure needs cleaning
From: MikeJeezy <forums@xxxxxxxxxxxx>
Date: Mon, 27 Feb 2012 10:32:55 -0800 (PST)
In-reply-to: <4F4B2281.1070200@xxxxxxxxxxxxxxxxx>
References: <33393100.post@xxxxxxxxxxxxxxx> <4F49B693.4080309@xxxxxxxxxxxxxxxxx> <33393429.post@xxxxxxxxxxxxxxx> <20120227004902.GQ3592@dastard> <33397518.post@xxxxxxxxxxxxxxx> <4F4B2281.1070200@xxxxxxxxxxxxxxxxx>
> You want the individual drive write caches disabled.  Leaving their read
caches enabled is fine.
>
>The reason is that a power drop, kernel panic, or hardware lockup
>(thermal etc) clears the drive write caches before the blocks are
>written to the platters.  It is suspected that many/most of these free
>space btree corruptions, such as yours here, are caused by data in
>caches not being flushed to the platters.  SAN/RAID controllers with
>BBWC usually guarantee data in the write cache gets properly flushed to
>the platters when the system comes back up. 

Makes total sense. Thanks so much.
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