PNFS Setup Instructions

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THIS IS OUT OF DATE.  The particular pnfs code described here is no longer under development.
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<h1>File Layout </h1>
<h1>File Layout </h1>
<H2>Accessing a storage system with pNFS</H2>
<H2>Accessing a storage system with pNFS</H2>
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<b>Step 0: Get pNFS kernel from git tree and install on all involved servers. </b>
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<b>Step 0: Get pNFS kernel from the [[PNFS Development Git tree]] and install on all involved servers. </b>
<p>
<p>
<b>Step 1: Setup NFSv4 servers</b>
<b>Step 1: Setup NFSv4 servers</b>
<UL>
<UL>
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<li>Create /etc/exports file on all DS's and the MDS.
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<li>Create <tt>/etc/exports</tt> file on all DS's and the MDS.
<pre>
<pre>
/export  *(rw,sync,fsid=0,insecure,no_subtree_check)
/export  *(rw,sync,fsid=0,insecure,no_subtree_check)
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</pre>
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Note: starting with 2.6.32-rc1, the "pnfs" export option is required.
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<pre>
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/export  *(rw,sync,fsid=0,insecure,no_subtree_check,pnfs)
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</pre>
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Until support for the "pnfs" export option is publicly released,
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please build and install <tt>exportfs</tt>, <tt>rpc.mountd</tt>, <tt>rpc.nfsd</tt>, and optionally, <tt>nfsstat</tt> from:
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<pre>
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git://linux-nfs.org/~bhalevy/pnfs-nfs-utils.git
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 +
To install just the required binaries:
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cp utils/exportfs/exportfs /usr/sbin/exportfs
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cp utils/mountd/mountd /usr/sbin/rpc.mountd
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cp utils/mountd/nfsd /usr/sbin/rpc.nfsd
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cp utils/nfsstat/nfsstat /usr/sbin/nfsstat
</pre>
</pre>
</li>
</li>
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<li>Run the following commands on on the storage server<p>
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<li>Tell the metadata server the IP addresses of the data servers:
<pre>
<pre>
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rpc.mountd
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echo "/dev/sdc:192.168.0.1,192.168.0.2" >/proc/fs/nfsd/pnfs_dlm_device
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rpc.nfsd 8
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</pre>
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exportfs -r
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(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.)
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</li>
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<li>If the nfs service requires starting then run the following commands on the metadata server
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<pre>
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/etc/init.d/nfs restart
or
or
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/etc/init.d/nfs start
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rpc.mountd
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rpc.nfsd 8
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exportfs -r
</pre></li>
</pre></li>
</UL>
</UL>
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<b>Step 2: Load File Layout driver on clients</b>
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<b>Step 2: Load Layout driver on clients</b>
<pre>
<pre>
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modprobe nfslayoutdriver
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modprobe nfs_layout_nfsv41_files
</pre>
</pre>
<b>Step 3: Mount pNFS file system.</b>
<b>Step 3: Mount pNFS file system.</b>
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<li>On pNFS client:
<li>On pNFS client:
<pre>
<pre>
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mount -t nfs4 <i>"mds_server_name"</i>:/ /mnt/pnfs
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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.
Note: Each file system has its own way of picking the MDS.  Ensure you mount only the MDS and not a DS.

Latest revision as of 15:56, 12 June 2015

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: 

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

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:192.168.0.1,192.168.0.2" >/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

or

rpc.mountd
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

Retrieved from "http://wiki.linux-nfs.org/wiki/index.php/PNFS_Setup_Instructions"
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