PVFS2 Roll: Users Guide: 
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The default partition used by PVFS2 storage servers (PVFS2 I/O Nodes and the PVFS2 Metadata Server) is /state/partition1. To change it, you'll need to run Rocks command line programs.
To check which partition a node is using, run the command:
# rocks list host pvfs partition pvfs2-io-0-0 |
This will produce output like:
PVFS PARTITION /state/partition1 |
To change the partition to /mydata, execute the command:
# rocks set host pvfs partition pvfs2-io-0-0 part=/mydata |
After you modify the PVFS2 partition info for a storage node, you must apply the change to the cluster -- see the section Applying the Configuration for details.
At this time, only one partition per storage node is supported.