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Re: Xfs Access to block zero exception and system crash

To: Sagar Borikar <sagar_borikar@xxxxxxxxxxxxxx>
Subject: Re: Xfs Access to block zero exception and system crash
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 1 Jul 2008 16:44:37 +1000
Cc: xfs@xxxxxxxxxxx
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On Mon, Jun 30, 2008 at 03:54:44PM +0530, Sagar Borikar wrote:
> After running my test for 20 min, when I check the fragmentation status  
> of file system, I observe that it
> is severely fragmented.

Depends on your definition of fragmentation....

> [root@NAS001ee5ab9c85 ~]# xfs_db -c frag -r /dev/RAIDA/vol
> actual 94343, ideal 107, fragmentation factor 99.89%

And that one is a bad one ;)

Still, there are a lot of extents - ~1000 to a file - which
will be stressing the btree extent format code.

> Do you think, this can cause the issue?

Sure - just like any other workload that generates enough
extents. Like I said originally, we've fixed so many problems
in this code since 2.6.18 I'd suggest that your only sane
hope for us to help you track done the problem is to upgrade
to a current kernel and go from there....


Dave Chinner

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