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Core dumps hang when dumping to NFS

  • 1.  Core dumps hang when dumping to NFS

    Posted Mon January 21, 2008 10:43 AM

    Originally posted by: Bruce


    We are trying to set up a central location to use for our core dumps and so are looking at using NFS. When simulating NFS failures in several ways we are finding that the core dumps hang indefinitely.

    We are using automount and so one way we simulate an NFS failure is to kill the automount daemon.

    Another way we are simulating an NFS failure is by changing the routing table so the route to the NFS servers is to a non-existent server.

    In either case a core dump hangs indefinitely, as well as commands such as ls on the mount point.

    Are there some parameters we can set so NFS will time out instead of hanging forever?

    We have a PMR open with IBM but so far the answer is "broken by design" :(

    Thanks!

    Forgot to mention we are using AIX 5.3 ML6.

    Message was edited by: Bruce
    #AIX-Forum


  • 2.  Re: Core dumps hang when dumping to NFS

    Posted Mon January 21, 2008 12:01 PM

    Originally posted by: SystemAdmin


    from a man page...

    #
    hard or soft — Specifies whether the program using a file via an NFS connection should stop and wait (hard) for the server to come back online, if the host serving the exported file system is unavailable, or if it should report an error (soft).

    If hard is specified, the user cannot terminate the process waiting for the NFS communication to resume unless the intr option is also specified.

    If soft is specified, the user can set an additional timeo=<value> option, where <value> specifies the number of seconds to pass before the error is reported.
    ...
    hope it helps,
    cheers.
    #AIX-Forum


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