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.carrasco@xxxxxxxxx> wrote:
2017-06-12 16:10 GMT+02:00 David Turner <drakonstein@xxxxxxxxx>: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 <jpetrini@xxxxxxxxxxxx> 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 = 1mds_standby_for_rank = 0mds_standby_replay = true___
John Petrini
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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
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