Re: XFS Kernel Panics in CentOS

To:	Mark Rechler <mrechler@xxxxxxxxxxxxxx>
Subject:	Re: XFS Kernel Panics in CentOS
From:	Stefan Ring <stefanrin@xxxxxxxxx>
Date:	Fri, 29 Jun 2012 23:38:58 +0200
Cc:	"xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
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> It turned out in my case to be related to:
> http://oss.sgi.com/bugzilla/show_bug.cgi?id=840
>
> Write barriers were not passed when using LVM/XFS/MegaRAID combined. After
> upgrading the kernel to 2.6.39 (used packages from
> http://elrepo.org/tiki/tiki-index.php) all XFS issues were resolved. The
> other solution was not using LVM.

I fail to see how missing write barriers can make a difference to what
the filesystem reads from the block layer. How is this possible? Does
the block layer not take the pending writes into account when handling
read requests?

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