What I found about PNFS
Switchboard
Getting Started
The Basics
Directory Tags
The PNFSD logfile format
The PNFSD wormholes .(config)
Removing files from Pnfs
I/O enabled files
Monitoring
Shrinking Pnfs Databases
Exchanging databases between pnfs systems
Checking consistency of backuped pnfs databases.
Release Notes V3.1.3
Release Notes V3.1.4
Release Notes V3.1.5