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Hopefully cloning this is useful. On EL6 you cannot disable just version 1, but you can disable version 2 (which also disables version 1). If you do, you get the same problem as before with EL5 and version 1. +++ This bug was initially created as a clone of Bug #595675 +++ Reproducer: On server: edit /etc/sysconfig/nfs and set MOUNTD_NFS_V2=no restart nfs On client: Mount a share from the server. This should be successful. Now try to unmount it. This fails with an error. # umount /mnt umount.nfs: vm22:/exports: not found / mounted or server not reachable umount.nfs: vm22:/exports: not found / mounted or server not reachable The cause appears to be the fact that the client when mounting uses MOUNT version 3 protocol. However when unmounting, it appears to use version 1 of the MOUNT protocol. Since version 1 is disabled, the client cannot unmount. --- Additional comment from steved on 2011-01-21 13:47:14 EST --- Created attachment 474657 [details] The patch that fixes the problem --- Additional comment from errata-xmlrpc on 2011-07-21 07:35:22 EDT --- An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-1048.html
Oops, maybe this is just still an issue with EL5 clients and version 2 being disabled on the server. Just tested with EL6 client and was able to unmount.
nfs-utils-1.0.9-60.el5
(In reply to comment #2) > Oops, maybe this is just still an issue with EL5 clients and version 2 being > disabled on the server. Just tested with EL6 client and was able to unmount. A bit confused... Can close this bz or is there still a problem with RHEL6 (or even RHEL5)?
Sorry about that. There does not appear to be a problem with RHEL6, but there is with RHEL5 client - can't unmount if the server has disabled version 2. So this either needs to get reassign back to RHEL5 or closed if we can't do that.
I just opened this clone: https://bugzilla.redhat.com/show_bug.cgi?id=804681