$ onnode 8 pwd
can't execute pwd, errno=95.
In the syslog on node 8 I find:
rmtfb_getcli_id: non-exportable filesystem (devpts)
When a node is in this state it stays like that until it's rebooted.
Currently being seen on my 2.6.12 based system. Don't know whether same problem exists on 2.6.11