Ah. Thanks for the info. I just need to know how to interpret the output! Brian Andrus ITACS/Research Computing Naval Postgraduate School Monterey, California voice: 831-656-6238 -----Original Message----- From: Eric Eastman [mailto:eric.eastman@xxxxxxxxxxxxxx] Sent: Friday, April 22, 2016 9:36 PM To: Andrus, Brian Contractor Cc: ceph-users@xxxxxxxxxxxxxx Subject: Re: Multiple MDSes 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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