Make sure that there are no repositories presented to the server when you attempt to remove it from the server pool. If this is the cause of the problem, the error that is displayed usually indicates that there are still OCFS2 file systems present. See Present or Unpresent Repository in the Oracle VM Manager User's Guide for more information.

If a pool file system is causing the remove operation to fail, other processes might be working on the pool file system during the unmount. Try removing the Oracle VM Server at a later time.

In a case where you try to remove a server from a clustered server pool on a newly installed instance of Oracle VM Manager, it is possible that the file server has not been refreshed since the server pool was discovered in your environment. Try refreshing all storage and all file systems on your storage before attempting to remove the Oracle VM Server.

In the situation where the Oracle VM Server cannot be removed from the server pool because the server has lost network connectivity with the rest of the server pool, or the storage where the server pool file system is located, a critical event is usually generated for the server in question. Try acknowledging any critical events that have been generated for the Oracle VM Server in question. See Events Perspective in the Oracle VM Manager User's Guide for more information. Once these events have been acknowledged you can try to remove the server from the server pool again. In most cases, the removal of the server from the server pool succeeds after critical events have been acknowledged, although some warnings may be generated during the removal process. Once the server has been removed from the server pool, you should resolve any networking or storage access issues that the server may be experiencing.

If the server is still experiencing trouble accessing storage and all critical events have been acknowledged and you are still unable to remove it from the server pool, try to reboot the server to allow it to rejoin the cluster properly before attempting to remove it again.

If the server pool file system has become corrupt for some reason, or a server still contains remnants of an old stale cluster, it may be necessary to completely erase the server pool and reconstruct it from scratch. This usually involves performing a series of manual steps on each Oracle VM Server in the cluster and should be attempted with the assistance of Oracle Support. More information on this procedure is available on My Oracle Support in KM Note 1615376.1 at:

https://support.us.oracle.com/oip/faces/secure/km/DocumentDisplay.jspx?id=1615376.1