[HPADM] Defrag VxFS Filesystems

From: Dave T. (davidlt77_at_hotmail.com)
Date: 09/29/03

  • Next message: Jim Langston: "[HPADM] SWC and 735/125 workstation" 
    To: hpux-admin@dutchworks.nl
Date: Mon, 29 Sep 2003 09:30:51 -0400

    I sent the following on Friday, but I never saw it appear in the HP-UX
    mailing list:

    I’m planning to perform defragmentation of HP-UX VxFS filesystems and Oracle
    filesystems on our 11.0 and 11i boxes, using fsadm. I’ve searched the Web
    and ITRC for gotchas, and following is what I have found:

    1. Run the defrags after hours, due to performance implications.
    2. Defrags can be run in full-blown multi-user mode.
    3. Defrags on HP-UX 10.x can potentially cause data corruption, if not
    patched properly. (This doesn’t affect our systems, since we’re on 11.x.)

    For those of you now scratching your head because you’ve never defragmented
    a UNIX filesystem, and you’re curious when you should do it, read the
    following excerpt from the man page of fsadm_vxfs:

          To determine whether a file system is fragmented, the free extents for
          that file system must be examined. If a large number of small extents
          are free, then there is fragmentation. If more than half of the
          amount of free space is taken up by small extents (smaller than 64
          blocks), or there is less than 5 percent of total file system space
          available in large extents, then there is serious fragmentation.

    Does anyone else have any other tidbits about performing defrags that would
    be useful?

    Dave

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