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  • 1.  AIX NFS SOFT MOUNT

    Posted 2 days ago

    Hello,

    i want to setup my nfs mount on AIX so that if nfs server is not reachable there will be no hang. We setup nfs with soft mount but we notice that if the nfs server is not available during boot time the boot process hangs. 

    our nfs mount on /etc/filesystems looks like this:

    /nfsmount:

        dev         = "/nfsdir"

        vfs         = nfs

        nodename    = nfsserver

        mount       = true

        options     = bg,soft,intr,timeo=5,retrans=2

        account     = false

    anything to rectify ?



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    Assane BA
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  • 2.  RE: AIX NFS SOFT MOUNT

    Posted yesterday
    Hi,

    I would increase your timeout value as 5ms could be a network latency and cause interruption.





    Original Message


  • 3.  RE: AIX NFS SOFT MOUNT

    Posted 20 hours ago
    While not directly related, the first thing I do (via setup scripts), is to move the console login much further up in the inittab, above any network entries.  If hangs occur, then you can get in and resolve issues.



    Original Message


  • 4.  RE: AIX NFS SOFT MOUNT

    Posted 15 hours ago

    Same here, and initially due to NFS mount hangs, but also entries that had an "wait" when they should have a "respawn" or "once".

    I usually put the console right after the srcmstr.



    ------------------------------
    José Pina Coelho
    IT Specialist at Kyndryl
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    Original Message


  • 5.  RE: AIX NFS SOFT MOUNT

    Posted 22 hours ago

    This is a well-known problem.  The NFS "mount=true" filesystems are processed in rc.nfs, causing the mounts of offline servers to hang.

    A more robust solution is to set all the NFS filesystems with "mount=false" and "type=net", then add an inittab entry after rc.nfs:

    nfsmnt:23456789:once:/usr/sbin/mount -t net > /dev/console 2>&1 # Note: it MUST be "once" so that it doesn't hang the rest of the inittab

    Another thing: an hung NFS mount directly on the root directory will cause path descent to hang if the server is unavailable.  This will happen for every single command that is exec'ed on the system.

    The workaround is to mount in /server/SERVERNAME/mountpoint and set a symbolic link in the previous mount location. 



    ------------------------------
    José Pina Coelho
    IT Specialist at Kyndryl
    ------------------------------

    Original Message


  • 6.  RE: AIX NFS SOFT MOUNT

    Posted 17 hours ago

    What I do is temporarily mount my software repo that lives on my NIM server.

    mount -o ro,soft,vers=3 nim0X:/softwareRepo /mnt

    The problem we had was that when we rebooted the nim server, the clients would get upset and hang a bit.  So, I have a command that goes out to the Nim clients and unmounts "/mnt" after a period of time.  The Mount command reports the date when file systems have been mounted.  So, what I do is if I mount /mnt in May, it will get unmounted in July.  It will be mounted for at least ~30 days and at most ~60 days.  If we are going to reboot the NIM server, we will scan the systems and unmount /mnt.

    # As you can see we see the date when the file system was mounted

    # mount |grep mnt
    nim0X //softwareRepo /mnt             nfs3   Jul 02 10:18 ro,soft,vers=3

    NOTE: Redhat does not report the date.  I also noticed that Azure uses/mnt for storage.  I do not auto-unmount on Linux.



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    Vinny G
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    Original Message


  • 7.  RE: AIX NFS SOFT MOUNT

    Posted 15 hours ago

    Another alternative is to use the automounter, that way the mounts are only done when you need them.



    ------------------------------
    José Pina Coelho
    IT Specialist at Kyndryl
    ------------------------------

    Original Message


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