I would take the analogy of a Raid scenario. Basically a standby is considered like a spare drive. If that spare drive goes down. It is good to know about the event, but it does in no way indicate a degraded system, everything keeps running at top speed.
If you had multi active MDS and one goes down then I would say that is a degraded system, but still waiting for that feature.
On Tue, Oct 18, 2016 at 10:18 AM Goncalo Borges <goncalo.borges@xxxxxxxxxxxxx> wrote:
Hi John.
That would be good.
In our case we are just picking that up simply through nagios and some fancy scripts parsing the dump of the MDS maps.
Cheers
Goncalo
________________________________________
From: ceph-users [ceph-users-bounces@xxxxxxxxxxxxxx] on behalf of John Spray [jspray@xxxxxxxxxx]
Sent: 18 October 2016 22:46
To: ceph-users
Subject: Feedback wanted: health warning when standby MDS dies?
Hi all,
Someone asked me today how to get a list of down MDS daemons, and I
explained that currently the MDS simply forgets about any standby that
stops sending beacons. That got me thinking about the case where a
standby dies while the active MDS remains up -- the cluster has gone
into a non-highly-available state, but we are not giving the admin any
indication.
I've suggested a solution here:
http://tracker.ceph.com/issues/17604
This is probably going to be a bit of a subjective thing in terms of
whether people find it useful or find it to be annoying noise, so I'd
be interested in feedback from people currently running cephfs.
Cheers,
John
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