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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. <br>
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>
</p>
<p>Brian Andrus<br>
</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 10/8/2017 4:42 AM, Jones, Peter A
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:61431336-5D77-49D8-B8F1-B91917557628@intel.com">
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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>
<div>
</div>
</div>
</div>
<div><br>
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<span id="OLK_SRC_BODY_SECTION">
<div>
<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>
</div>
<div><br>
</div>
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style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0
0 0 5;">
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<div>
<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>
<div><br>
</div>
<div>Thanks.</div>
</div>
</div>
</div>
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