If I'm not mistaken, if you stop them at the same time during a reboot on a node with both mds and mon, the mons might receive it, but wait to finish their own election vote before doing anything about it. If you're trying to keep optimal uptime for your mds, then stopping it first and on its own makes sense.
On Wed, Feb 20, 2019 at 3:46 PM Patrick Donnelly <pdonnell@xxxxxxxxxx> wrote:
On Tue, Feb 19, 2019 at 11:39 AM Fyodor Ustinov <ufm@xxxxxx> wrote:
>
> Hi!
>
> From documentation:
>
> mds beacon grace
> Description: The interval without beacons before Ceph declares an MDS laggy (and possibly replace it).
> Type: Float
> Default: 15
>
> I do not understand, 15 - are is seconds or beacons?
seconds
> And an additional misunderstanding - if we gently turn off the MDS (or MON), why it does not inform everyone interested before death - "I am turned off, no need to wait, appoint a new active server"
The MDS does inform the monitors if it has been shutdown. If you pull
the plug or SIGKILL, it does not. :)
--
Patrick Donnelly
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