I've received following error while trying to perform full database export using datapump to NFS:
Export: Release 10.2.0.4.0 - Production on Tuesday, 31 May, 2011 11:27:50 Copyright (c) 2003, 2007, Oracle. All rights reserved. Connected to: Oracle Database 10g Release 10.2.0.4.0 - Production ORA-39001: invalid argument value ORA-39000: bad dump file specification ORA-31641: unable to create dump file "/backup-nfs/testdb/export/exportfull.dmp" ORA-27086: unable to lock file - already in use Linux Error: 37: No locks available Additional information: 10
In this case problem was lying in NFS locking deamons - on most Unix-like systems also known as rpc.lockd and the rpc.statd.
Checking if 'nfslock' service is running:
# service nfslock status rpc.statd is stopped
Start 'nfslock' service:
# /etc/init.d/nfslock start Starting NFS statd: [ OK ]
# service nfslock status rpc.statd (pid 4943) is running...
Starting 'nfslock' service resolved my problem with performing export to NFS.