[Linux-cluster] uncontrolled entry

[David Teigland]

On Thu, Oct 24, 2013 at 05:18:02PM +0300, Vladimir Melnik wrote:
> I'll be very grateful for any clue or advice. I have a cluster (GFS2/DLM on
> iSCSI). Something happened today, so one node has stopped working in cluster
> and all operations with the filesystem was giving "input/output errors".
> Other nodes are working okay.
> 
> I unmounted the filesystem and stopped all services (gfs2, clvmd, cman,
> iscsi, iscsid), but I can't start cman again. That's what I have in
> log-files:
> 	fenced[2801]: found uncontrolled entry
> /sys/fs/gfs2/ckvm1_pod1:vg_psv4
> 	gfs_controld[2878]: found uncontrolled gfs2 fs ckvm1_pod1:vg_psv4
> 
> Yes, I really have this "uncontrolled entry", how to get rid of it without
> rebooting the node?

That's not possible; you must reboot the node to clear it.  The problem is
caused when gfs_controld dies or is killed while gfs2 is still mounted.
This leaves an orphaned/uncontrolled gfs2 fs in the kernel (the same also
applies to dlm).  The machine must be rebooted to clear it.