[lustre-discuss] MGS IP in a HA cluster

[Indivar Nair]

Hi Sid,

1.
-- You don't need a Cluster/Virtual IP for Lustre. Only the MGT, MDT and
OST volumes need to be failed over.
    When these volumes are failed over to the other server, all the
components of the Lustre file system are informed about this failover, and
they will then continue accessing these volumes using the IP of the
failover server.

2.
-- No. MGS IP should also be in the same network(s) as MDS and OSS.

If you are using IML for installation and management of Lustre, then this
should be on a different network (for example, your 10G network (or a 1G
network)).

Regards,


Indivar Nair

On Thu, Feb 18, 2021 at 10:29 AM Sid Young <sid.young at gmail.com> wrote:

> G'day all,
>
> I'm trying to get my head around configuring a new Lustre 2.12.6 cluster
> on Centos 7.9, in particular the correct IP(s) for the MGS.
>
> In a pacemaker based MDS cluster, when I define the IP for the HA, is that
> the same IP used when referencing the MGS, or is the MGS IP only specified
> by using the IP of both the MDS servers (assume dual MDS HA cluster here)?
>
> And, if I have a 100G ethernet network (for RoCE) for Lustre usage and a
> 10G network for server access is the MGS IP based around the 100G network
> or my 10G network?
>
> Any help appreciated :)
>
> Sid Young
>
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> lustre-discuss at lists.lustre.org
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