[lustre-discuss] Lustre Client in a container

Patrick Farrell paf at cray.com
Wed Jan 3 03:49:47 PST 2018

FWIW, as long as you don’t intend to use any interesting features (quotas, etc), 1.8 clients were used with 2.5 servers at ORNL for some time with no ill effects on the IO side of things.

I’m not sure how much further that limited compatibility goes, though.
From: Dilger, Andreas <andreas.dilger at intel.com>
Sent: Wednesday, January 3, 2018 4:20:56 AM
To: David Cohen
Cc: Patrick Farrell; lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] Lustre Client in a container

On Dec 31, 2017, at 01:50, David Cohen <cdavid at physics.technion.ac.il> wrote:
> 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.

Note that there is no longer direct support for upgrading from 1.8 to 2.10.

That said, are you upgrading the filesystem in place, or are you copying the data from the 1.8.9 filesystem to the 2.10.2 filesystem?  In the latter case, the upgrade compatibility doesn't really matter.  What you need is a client that can mount both server versions at the same time.

Unfortunately, no 2.x clients can mount the 1.8.x server filesystem directly, so that does limit your options.  There was a time of interoperability with 1.8 clients being able to mount 2.1-ish servers, but that doesn't really help you.  You could upgrade the 1.8 servers to 2.1 or later, and then mount both filesystems with a 2.5-ish client, or upgrade the servers to 2.5.

Cheers, Andreas

> 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

Cheers, Andreas
Andreas Dilger
Lustre Principal Architect
Intel Corporation

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