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Thread: large NFS copy locks up/hang client with large files (again) (lucid)

  1. #71
    Join Date
    May 2007
    Beans
    49

    Re: large NFS copy locks up/hang client with large files (again) (lucid)

    I tried all sorts of things to solve this issue - it was happening in SMB as well.

    My resolution was to move to the 32bit server - it now works as expected and as it is the pae kernel, i can use more than 4GB - what is not to like?

    ice.

  2. #72
    Join Date
    May 2008
    Beans
    14

    Re: large NFS copy locks up/hang client with large files (again) (lucid)

    I'm having good result with the following configuration:

    4 IBM systemx, ALL with ubuntu 12.04.01 64 bit

    server, /etc/exports
    /home/cfduser/OpenFOAM 192.168.0.19(rw,sync,root_squash,no_subtree_check) 192.168.0.21(rw,sync,root_squash,no_subtree_check) 192.168.0.23(rw,sync,root_squash,no_subtree_check)
    192.168.0.17:/home/cfduser/OpenFOAM /home/cfduser/OpenFOAM/ nfs4 _netdev,auto 0 0


    clients /etc/fstab
    192.168.0.17:/home/cfduser/OpenFOAM /home/cfduser/OpenFOAM/ nfs4 _netdev,auto 0 0
    #192.168.0.17:/home/cfduser/OpenFOAM /home/cfduser/OpenFOAM/ nfs _netdev,nfsvers=3,proto=tcp,noac,auto 0 0


    -----------------------------------------------------
    writing a dd test on a local directory I get 90Gb sec. We have all the 4 nodes on one HP switch 1910.

    If I run the dd test on a nfs directory, like
    time dd bs=1M count=128 if=/dev/zero of=/home/cfduser/OpenFOAM/speedtest2 conv=fdatasync

    I get a speed of 20 Gb/s
    not so good, not so baad... (considering conv=fdatasync)

    What are your values ?

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