GFS2 and fragmentation

Scooter Morris <scooter@xxxxxxxxxxxx> · Tue, 07 Aug 2012 15:06:24 -0700



    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:

    
        At what point should we be worried about the number of
          extents?
        Are there plans for a defragmentation tool?
      
    
    Thanks!

    
    -- scooter

    
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