[lustre-discuss] Lustre Client in a container

Patrick Farrell paf at cray.com
Sun Dec 31 14:38:24 PST 2017



Keeping in mind that the choice of NFS means that you don’t have the POSIX guarantees provided by Lustre, so simultaneous access to the same files is dicey unless it’s only reading.
________________________________
From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of Daniel Kobras <kobras at linux.de>
Sent: Sunday, December 31, 2017 12:26:49 PM
To: David Cohen
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] Lustre Client in a container

Hi David!

Do you require both systems to be available as native Lustre filesystems on all clients? Otherwise, reexporting one of the systems via NFS during the migration phase will keep all data available but decouple the version interdependence between servers and clients. In this situation, it’s probably the least experimental option.

Kind regards,

Daniel

> Am 31.12.2017 um 09:50 schrieb David Cohen <cdavid at physics.technion.ac.il>:
>
> Patrick,
> Thanks for you response.
> I looking for a way to migrate from 1.8.9 system to 2.10.2, stable enough to run the several weeks or more that it might take.
>
>
> David
>
> On Sun, Dec 31, 2017 at 12:12 AM, Patrick Farrell <paf at cray.com> wrote:
> David,
>
> I have no direct experience trying this, but I would imagine not - Lustre is a kernel module (actually a set of kernel modules), so unless the container tech you're using allows loading multiple different versions of *kernel modules*, this is likely impossible.  My limited understanding of container tech on Linux suggests that this would be impossible, containers allow userspace separation but there is only one kernel/set of modules/drivers.
>
> I don't know of any way to run multiple client versions on the same node.
>
> The other question is *why* do you want to run multiple client versions on one node...?  Clients are usually interoperable across a pretty generous set of server versions.
>
> - Patrick
>
>
> From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of David Cohen <cdavid at physics.technion.ac.il>
> Sent: Saturday, December 30, 2017 11:45:15 AM
> To: lustre-discuss at lists.lustre.org
> Subject: [lustre-discuss] Lustre Client in a container
>
> Hi,
> Is it possible to run Lustre client in a container?
> The goal is to run two different client version on the same node, can it be done?
>
> David
>
>
> _______________________________________________
> lustre-discuss mailing list
> lustre-discuss at lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org

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