NFS hanging

From: Paul Dlug (paul_at_aps.org)
Date: 06/25/03

  • Next message: Ratliff, Charlotte: "Configure Network interfaces for best utilization" 
    Date: Tue, 24 Jun 2003 18:06:36 -0400
To: sunmanagers@sunmanagers.org

    We have 3 or 4 sun servers experiencing the same issue. All are
    mounting NFS file systems containing user home directories off a
    Network Appliance filer. The filesystem seems to "hang", when untarring
    a file it will progress very very slowly, the next attempt will go very
    quickly and subsequent tries will hang sporadically. Users are noticing
    this behavior when opening mailboxes in pine that are located in their
    home directories. They'll be working just fine, then hit one mailbox
    which will wait for 30sec-1min to open. Turning on debugging in pine
    shows an excessing number of "alarm_signal()" in the debug file.

    nfsstat -c shows some timeouts and retries but they're not that
    excessive:
    Connectionless:
    calls badcalls retrans badxids timeouts newcreds
    2805125 146 15158 0 15153 0
    badverfs timers nomem cantsend
    0 9602 0 0

    Load on the filer is extremely low, nothing above 2-8% cpu utilization
    with only a few hundred NFS ops/sec. Network connections all seem fine
    (100mbps full duplex from server to switch, 1000mbps full duplex from
    filer to switch). All are on the same switch with no collisions or
    network errors of any kind.

    Does anyone have any suggestions for debugging this? I'm rapidly
    reaching my limits.

    Thanks,
    Paul
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  • Next message: Ratliff, Charlotte: "Configure Network interfaces for best utilization"

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