From Linux NFS

File Layout

Accessing a storage system with pNFS

Step 0: Get pNFS kernel from 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 from:

  git://linux-nfs.org/~bhalevy/pnfs-nfs-utils.git
  

• Run the following commands on the storage server<p>

  rpc.mountd
  rpc.nfsd 8
  exportfs -r
  
  or
  
  /etc/init.d/nfs start
  

Step 2: Load File Layout driver on clients

modprobe nfslayoutdriver

Step 3: Mount pNFS file system.

• On pNFS client:

  mount -t nfs4 <i>"mds_server_name"</i>:/ /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