It is also useful to mention that you can set the noout flag when doing
maintenance of any given length needs to exceeds the 'mon osd down out
interval'.
$ ceph osd set noout
** no re-balancing will happen **
$ ceph osd unset noout
** normal re-balancing rules will resume **
- Mike Dawson
On 12/19/2013 7:51 PM, Sage Weil wrote:
On Thu, 19 Dec 2013, John-Paul Robinson wrote:
What impact does rebooting nodes in a ceph cluster have on the health of
the ceph cluster? Can it trigger rebalancing activities that then have
to be undone once the node comes back up?
I have a 4 node ceph cluster each node has 11 osds. There is a single
pool with redundant storage.
If it takes 15 minutes for one of my servers to reboot is there a risk
that some sort of needless automatic processing will begin?
By default, we start rebalancing data after 5 minutes. You can adjust
this (to, say, 15 minutes) with
mon osd down out interval = 900
in ceph.conf.
sage
I'm assuming that the ceph cluster can go into a "not ok" state but that
in this particular configuration all the data is protected against the
single node failure and there is no place for the data to migrate too so
nothing "bad" will happen.
Thanks for any feedback.
~jpr
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