Did you try `umount -f`? I wouldn't say that is 'clean', but might
avoid a reboot. It would seem there isn't much else that can be done
if there is dirty data and no cluster to flush it to.
This also looks relevant:
http://tracker.ceph.com/issues/206
On Thu, Nov 28, 2013 at 9:51 PM, Ketor D
Hi Sage:
We are testing cephfs mouting by kernel 3.12. And we meet a
situation that we cannot umount cephfs and also cannot reboot the
client machine. Only hard reset can restart the client machine.
Here is the flow:
1) Create a ceph cluster with 3 mons, 2 mds
