Re: 4.14 kernel or greater recommendation for multiple active MDS

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I've seen issues with clients reconnects on older kernels, yeah. They
sometimes get stuck after a network failure

Paul

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On Thu, Apr 30, 2020 at 10:19 PM Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:

> On Tue, Apr 28, 2020 at 11:52 AM Robert LeBlanc <robert@xxxxxxxxxxxxx>
> wrote:
> >
> > In the Nautilus manual it recommends >= 4.14 kernel for multiple active
> > MDSes. What are the potential issues for running the 4.4 kernel with
> > multiple MDSes? We are in the process of upgrading the clients, but at
> > times overrun the capacity of a single MDS server.
>
> I don't think this is documented specifically; you'd have to go
> through the git logs. Talked with the team and 4.14 was the upstream
> kernel when we marked multi-MDS as stable, with the general stream of
> ongoing fixes that always applies there.
>
> There aren't any known issues that will cause file consistency to
> break or anything; I'd be more worried about clients having issues
> reconnecting when their network blips or an MDS fails over.
> -Greg
>
> >
> > MULTIPLE ACTIVE METADATA SERVERS
> > <
> https://docs.ceph.com/docs/nautilus/cephfs/kernel-features/#multiple-active-metadata-servers
> >
> >
> > The feature has been supported since the Luminous release. It is
> > recommended to use Linux kernel clients >= 4.14 when there are multiple
> > active MDS.
> > Thank you,
> > Robert LeBlanc
> > ----------------
> > Robert LeBlanc
> > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904  C70E E654 3BB2 FA62 B9F1
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