On Fri, Apr 22, 2016 at 9:59 PM, Andrus, Brian Contractor
<bdandrus@xxxxxxx> wrote:
> All,
>
> Ok, I understand Jewel is considered stable for CephFS with a single active
> MDS.
>
> But, how do I add a standby MDS? What documentation I find is a bit
> confusing.
>
> I ran
>
> ceph-deploy create mds systemA
> ceph-deploy create mds systemB
>
> Then I create a ceph filesystem, but it appears systemB is the active and
> only mds:
>
> e6: 1/1/1 up {1:0=systemB=up:active}, 1 up:standby
>
> Is there something to do to get systemA up and standby?
Your output: "1 up:standby" shows that you have 1 standby MDS. On my
system with 3 MDS, running Jewel, the output is:
fsmap e12: 1/1/1 up {1:0=ede-c1-mds01=up:active}, 2 up:standby
You can prove this by shutting down your systemB and seeing that you
can still access your Ceph file system. By default, if you create
multiple MDS, you get 1 active MDS and the rest are standby.
Eric
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