[lustre-discuss] Lustre clients and Lustre servers (MDS/OSS) operating system requirements?

[Patrick Farrell]

Amjad,

To answer your question more directly…  Operating system differences between client and server don’t matter – it’s very common to deploy clients and servers using different kernels and/or different distributions.

However, Lustre versions do matter.  There is probably no client version that would build for RHEL 7 that would also work with server 1.8.7, which I believe is the last server to support RHEL 5.x.  So, because of which kernels are supported by which Lustre versions, this is probably impossible in practice.

You really, really should just upgrade the servers.  RHEL 5 is incredibly out of date, and 1.8.7 is quite old as well.

- Patrick

From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org<mailto:lustre-discuss-bounces at lists.lustre.org>> on behalf of Brian Andrus <toomuchit at gmail.com<mailto:toomuchit at gmail.com>>
Date: Sunday, October 8, 2017 at 5:18 PM
To: "lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>" <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>>
Subject: Re: [lustre-discuss] Lustre clients and Lustre servers (MDS/OSS) operating system requirements?


Hmm. Well, I used to take care of the cluster at the Naval Postgraduate School, and I would always upgrade both. When we went to 7, it was on the Luster servers first (the nodes were on 6).

The only thing I could guess is a FUD factor (Fear-Uncertainty-Doubt). We did several kernel upgrades without an issue.
I expect the concern is about data loss, but the path has been traveled by many very large instances, so with a proper plan, there is no worry.

Brian Andrus


On 10/8/2017 4:42 AM, Jones, Peter A wrote:
Hmm. Perhaps one of the end user sites will speak up with something that they have tried successfully but I cannot think of anyone that I have heard running RHEL 5.x on the Lustre servers but RHEL 7.x on the Lustre clients.  Why os there a reluctance to upgrade the OS on the storage servers? Is it older storage not supported on supported with newer version of RHEL?

On 2017-10-07, 10:59 PM, "lustre-discuss on behalf of Amjad Syed" <lustre-discuss-bounces at lists.lustre.org<mailto:lustre-discuss-bounces at lists.lustre.org> on behalf of amjadcsu at gmail.com<mailto:amjadcsu at gmail.com>> wrote:

Hello,
We have an existing HPC running Lustre 1.8.7 on RHEL 5.4
The Lustre servers (MDS and OSS) are all running RHEL 5.4
The Lustre clients(HPC compute nodes)  are also running RHEL 5.4
Now the management has decided to upgrade the compute nodes to RHEL 7.
But they do not want to upgrade the OS of Lustre Servers which is still RHEL 5.4
So the question is will this configuration work where the Lustre clients are RHEL 7 and Lustre server are all running RHEL 5.4?

Thanks.



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