Since your app is an Apache / php app is it possible for you to reconfigure the app to use S3 module rather than a posix open file()? Then with Ceph drop CephFS and configure Civetweb S3 gateway? You can have "active-active" endpoints with round robin dns or F5 or something. You would also have to repopulate objects into the rados pools.
Also increase that size parameter to 3. ;-) Lots of work for active-active but the whole stack will be much more resilient coming from some with a ClearCase / NFS / stale file handles up the wazoo background On Mon, Jun 12, 2017 at 10:41 AM, Daniel Carrasco <d.carra...@i2tic.com> wrote: > 2017-06-12 16:10 GMT+02:00 David Turner <drakonst...@gmail.com>: > >> I have an incredibly light-weight cephfs configuration. I set up an MDS >> on each mon (3 total), and have 9TB of data in cephfs. This data only has >> 1 client that reads a few files at a time. I haven't noticed any downtime >> when it fails over to a standby MDS. So it definitely depends on your >> workload as to how a failover will affect your environment. >> >> On Mon, Jun 12, 2017 at 9:59 AM John Petrini <jpetr...@coredial.com> >> wrote: >> >>> We use the following in our ceph.conf for MDS failover. We're running >>> one active and one standby. Last time it failed over there was about 2 >>> minutes of downtime before the mounts started responding again but it did >>> recover gracefully. >>> >>> [mds] >>> max_mds = 1 >>> mds_standby_for_rank = 0 >>> mds_standby_replay = true >>> >>> ___ >>> >>> John Petrini >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> > > Thanks to both. > Just now i'm working on that because I needs a very fast failover. For now > the tests give me a very fast response when an OSD fails (about 5 seconds), > but a very slow response when the main MDS fails (I've not tested the real > time, but was not working for a long time). Maybe was because I created the > other MDS after mount, because I've done some test just before send this > email and now looks very fast (i've not noticed the downtime). > > Greetings!! > > > -- > _________________________________________ > > Daniel Carrasco Marín > Ingeniería para la Innovación i2TIC, S.L. > Tlf: +34 911 12 32 84 Ext: 223 > www.i2tic.com > _________________________________________ > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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