When nfslock service is turned off, export ends with an ORA-27086 error when trying to backup on a NFS mounted directory. To resolve this error, the nfslock service must be started.
The error received during export is as follows.
ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-31641: unable to create dump file "/export/orcl01.dmp"
ORA-27086: unable to lock file - already in use
Linux-x86_64 Error: 37: No locks available
Additional information: 10
Checking the status of the nfslock service:
# service nfslock status
rpc.statd is stopped
Starting nfslock service
# /etc/init.d/nfslock start
Starting NFS statd: [ OK ]
Then, export will be completed successfully.
You can use the following command to automatically start the nfslock service each time the server starts.
# chkconfig nfslock on
NOTE: The above commands apply to Red-Hat and derivatives systems. It will differ in other distributions.