Re: ceph replication and data redundancy

[Joao Eduardo Luis <joao.luis@inktank.com>]

On 01/21/2013 08:14 AM, Ulysse 31 wrote:
> Hi everybody,
>
> In fact, i found searching the doc on section "adding/removing a
> monitor", infos about the paxos system used for quorum establishment.
> Following the documentation, in a catastrophy scenario, i need to
> remove the other monitors configured on the other buildings.
> For better efficiency, i think i'll keep 1 monitor per building, and,
> if two other building fails, i will delete those two monitors from the
> configuration in order to access data again.
> I'll simulate that and see if it goes well.
> Thanks for your help and advices.

If you are set on that approach, you could just as well add a third 
monitor on one of the buildings (whichever you feel to be more 
resilient), and cut down the chances of an unavailable cluster if the 
other fails.

It doesn't solve your problem, but if the building with just one monitor 
fails, your cluster will still be available; if it's the other way 
around, you could do the manual recovery just the same anyway.

   -Joao