Re: MDS blocklist/evict clients during network maintenance

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Hi Eugene,

Disabling blocklisting on eviction is a pretty standard config. In my
experience it allows clients resume their session cleanly without needing a
remount.

There's docs about this here:
https://docs.ceph.com/en/latest/cephfs/eviction/#advanced-configuring-blocklisting

I don't have a good feeling if this will be useful for your network
intervention though... What are you trying to achieve? How long will
clients be unreachable?

Cheers, Dan


--
Dan van der Ster
CTO@CLYSO & CEC Member


On Thu, Nov 21, 2024, 10:15 Eugen Block <eblock@xxxxxx> wrote:

> Hi,
>
> can anyone share some experience with these two configs?
>
> ceph config get mds mds_session_blocklist_on_timeout
> true
> ceph config get mds mds_session_blocklist_on_evict
> true
>
> If there's some network maintenance going on and the client connection
> is interrupted, could it help to disable evicting and blocklisting MDS
> clients? And what risks should we be aware of if we tried that? We're
> not entirely sure yet if this could be a reasonable approach, but
> we're trying to figure out how to make network maintenance less
> painful for clients.
> I'm also looking at some other possible configs, but let's start with
> these two first.
>
> Any comments would be appreciated!
>
> Thanks!
> Eugen
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