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[Linux-cluster] GFS2 and fragmentation



Hi All,
    We have a RedHat 6.2 cluster with 4 nodes using GFS2 for shared filesystems.  One of the filesystems we need to share is /var/spool/mail.  In general, with recent upgrades and improvements to GFS2, which has been working really, really well.  We're starting to see some significant fragmentation on files in the filesystem, though, even after recreating the filesystem after the RHEL 6 upgrade.  My understanding was that there were fixes in RHEL 6 that made defragmentation un-(or less?) necessary, but we're seeing a disturbing increase in the amount of fragmentation since the upgrade.  By the way, we're seeing numbers in the range of 4,000-6,000 extents/GB for some of these files, which seems a bit large. 
    So, I've got two questions:
  1. At what point should we be worried about the number of extents?
  2. Are there plans for a defragmentation tool?

Thanks!

-- scooter


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