PNFS Setup Instructions

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THIS IS OUT OF DATE. The particular pnfs code described here is no longer under development.

File Layout

Accessing a storage system with pNFS

Step 0: Get pNFS kernel from the PNFS Development Git tree and install on all involved servers.

Step 1: Setup NFSv4 servers

  • Create /etc/exports file on all DS's and the MDS.
    /export  *(rw,sync,fsid=0,insecure,no_subtree_check)

    Note: starting with 2.6.32-rc1, the "pnfs" export option is required.

    /export  *(rw,sync,fsid=0,insecure,no_subtree_check,pnfs)

    Until support for the "pnfs" export option is publicly released, please build and install exportfs, rpc.mountd, rpc.nfsd, and optionally, nfsstat from:

    To install just the required binaries:
    cp utils/exportfs/exportfs /usr/sbin/exportfs
    cp utils/mountd/mountd /usr/sbin/rpc.mountd
    cp utils/mountd/nfsd /usr/sbin/rpc.nfsd
    cp utils/nfsstat/nfsstat /usr/sbin/nfsstat
  • Tell the metadata server the IP addresses of the data servers:
    echo "/dev/sdc:," >/proc/fs/nfsd/pnfs_dlm_device

    (replacing /dev/sdc by the name of the device hosting the exported gfs2 filesystem, and the ip addresses by the ip addresses of your data servers.)

  • If the nfs service requires starting then run the following commands on the metadata server
    /etc/init.d/nfs restart
    rpc.nfsd 8
    exportfs -r

Step 2: Load Layout driver on clients

modprobe nfs_layout_nfsv41_files

Step 3: Mount pNFS file system.

  • On pNFS client:
    mount -t nfs4 -o minorversion=1 <mds_server>:/ /mnt/pnfs
    Note: Each file system has its own way of picking the MDS.  Ensure you mount only the MDS and not a DS.

Debugging Help

  • NFS debugging:
    echo 32767 > /proc/sys/sunrpc/nfsd_debug
    echo 32767 > /proc/sys/sunrpc/nfs_debug

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