If you exported a DCE LFS aggregate or non-LFS partition (either by adding the dfsexport command to the proper initialization file - /etc/rc or its equivalent - or by issuing the command directly), you can issue the dfsexport command with the -detach option to remove the aggregate or partition from the DCE namespace.
Before the command detaches an exported aggregate or partition, it first revokes all of the tokens for data on the aggregate or partition. When its tokens are revoked, a client flushes the data that is cached from the aggregate or partition, writing any modified data back to the File Server machine. The command does not perform the detach operation if it cannot revoke all necessary tokens; it instead reports that the device is busy. In this case, the command's -force option can be included to force completion of the detach operation even if all necessary tokens cannot be revoked.
In general, avoid detaching an aggregate or partition if users are still accessing filesets that reside on it. The dfsexport command revokes all tokens for data on the aggregate or partition before it detaches it, but users accessing data from the aggregate or partition will not be able to save the data. Be especially cautious when using the -force option, which forces an aggregate or partition to be detached even if all tokens cannot be revoked.