On Mon, Feb 25, 2013 at 3:39 PM, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote:
>
>
> > Can anyone provide any suggestions as to an explanation for the behavior or
> > a way to mitigate it? Running xfs_fsr didn't seem to improve the results.
>
> The usual cause of such aged filesystem low performance is free space
> fragmentation. xfs_fsr will defragment files, but in doing so it
> *increases* free space fragmentation, thus won't help the situation.
>
> > I'm happy to share benchmarks, specific results data, or describe the
> > hardware being used for the measurements if it's helpful.
>
> Paste the output of 'xfs_db -r -c freesp /dev/[device]' just before you
> do the large file write. This will show us the free space distribution
> histogram.
>
Running now...
Here's a single sample:
from to extents blocks pct
1 1 128 128 0.00
2 3 6 18 0.00
4 7 1 7 0.00
8 15 30 275 0.00
512 1023 1 528 0.01
2048 4095 1 2656 0.03
4194304 8388608 1 8388588 99.96
--
-Brian
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