Before you can dismount an NSS volume on Linux, you must dismount the volume from NCP Server; otherwise, the dismount function fails.
If NCP Server is running, dismount the volume from NCP Server.
At the server prompt, open the NCP Console by entering
Dismount the volume from NCP.
The volume is no longer accessible or visible to NCP clients.
Dismount the volume.
From a terminal console, start NSSMU, then select.
In thelist, select the encrypted volume that you want to dismount.
Pressto dismount the mounted volume.