Re: HA Filesystem mode (MON, OSD, MDS) with Ceph and HAof MDS daemon.

[Daniel Carrasco <d.carrasco@xxxxxxxxx>]

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 = 1

mds_standby_for_rank = 0

mds_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!!

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