> This is very likely to be due to the way older versions of XFS
> managed incore inode extent lists. So, you've likely got a very
> fragmented file/files here, and XFS used to require large amounts
> of contiguous memory to deal with that.
More than likely - the filesystem is exported to our Blue Gene rack
so gets hammered by parallel IO constantly. Oh, and the server also
exports a chunk of SATA raid out (3ware controller) as pvfs2...
I guess our priority should be to try and "source" some more memory
than the 512M we have in at the moment.
> Your options are to take
> steps to combat inode extent fragmentation (like fsr), or use a
> more recent kernel (2.6.17+ IIRC).
OK - we were trying to stay reasonably simple by using vendor kernels but I
guess it's time for a quick "make menuconfig"
Ta
Andrew
--
Andrew Elwell, System Administrator EPCC
Tel 0131 445 7833 (ACF Building)
Tel 0131 650 5023 (Rm 3309, JCMB)
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