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<div>Amjad,</div>
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<div>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.</div>
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<div>However, Lustre versions <span style="font-weight: bold;">do</span> 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.</div>
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<div>You really, really should just upgrade the servers. RHEL 5 is incredibly out of date, and 1.8.7 is quite old as well.</div>
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<div>- Patrick</div>
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<span style="font-weight:bold">From: </span>lustre-discuss <<a href="mailto:lustre-discuss-bounces@lists.lustre.org">lustre-discuss-bounces@lists.lustre.org</a>> on behalf of Brian Andrus <<a href="mailto:toomuchit@gmail.com">toomuchit@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Sunday, October 8, 2017 at 5:18 PM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>" <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [lustre-discuss] Lustre clients and Lustre servers (MDS/OSS) operating system requirements?<br>
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<p>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).</p>
<p>The only thing I could guess is a FUD factor (Fear-Uncertainty-Doubt). We did several kernel upgrades without an issue.
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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.<br>
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<p>Brian Andrus<br>
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<div class="moz-cite-prefix">On 10/8/2017 4:42 AM, Jones, Peter A wrote:<br>
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<div>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?</div>
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<div>On 2017-10-07, 10:59 PM, "lustre-discuss on behalf of Amjad Syed" <<a href="mailto:lustre-discuss-bounces@lists.lustre.org" moz-do-not-send="true">lustre-discuss-bounces@lists.lustre.org</a> on behalf of
<a href="mailto:amjadcsu@gmail.com" moz-do-not-send="true">amjadcsu@gmail.com</a>> wrote:</div>
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<div dir="ltr">Hello,
<div>We have an existing HPC running Lustre 1.8.7 on RHEL 5.4</div>
<div>The Lustre servers (MDS and OSS) are all running RHEL 5.4</div>
<div>The Lustre clients(HPC compute nodes) are also running RHEL 5.4</div>
<div>Now the management has decided to upgrade the compute nodes to RHEL 7.</div>
<div>But they do not want to upgrade the OS of Lustre Servers which is still RHEL 5.4</div>
<div>So the question is will this configuration work where the Lustre clients are RHEL 7 and Lustre server are all running RHEL 5.4?</div>
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<div>Thanks.</div>
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