[ceph-users] Options/scenarios for a dead monitor

Martin B Nielsen martin at unity3d.com
Thu Feb 21 13:44:51 PST 2013

Thanks, I like that analogy ;).

Going back to that; if that mob accountant had a part-time helper who
knew how things were just a day ago, would that help?

As in, if one had a relatively recent backup - would it be possible to
create a new monitor based on that and continue? Or would it be in
vain since everything would have changed so much in the meantime?

I know it would be much easier to run 3x mon, I'm just wondering what
options there would be in case a 1-mon setup explodes.


On Thu, Feb 21, 2013 at 10:38 PM, Mike Lowe <j.michael.lowe at gmail.com> wrote:
> Think of yourself as a mob boss and the mon is your mob accountant.  While you may have all of the account numbers where you have stashed your ill gotten gains only your accountant knows which bank those account numbers belong to.  If you or somebody else whacks your sole accountant then your money is gone.  Oh, and your accountants may lie to you so best to have an odd number and let the majority rule.
> On Feb 21, 2013, at 4:22 PM, Martin B Nielsen <martin at unity3d.com> wrote:
>> Hi,
>> Just curious here - if a setup would have only 1 monitor - and that
>> monitor dies; what would happen?
>> If say the cluster is only used as rbd with blockdevices running VM -
>> would they keep running or would everything just stop?
>> Also, what options would there be if the disk with the monitor died
>> and there was no backup? Can one create a new monitor and just dump
>> into the cluster or would that require a complete backup of whatever
>> the original monitor had (as in, if the disks of the one monitor dies
>> and one has no backup = game over?). Or would a backup not even
>> suffice?
>> Thanks in advance,
>> /Martin
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