<div dir="auto"><div>Hi Megan, I have no experience with DDN, but totally agree with Cory on interoperability.</div><div dir="auto"> in our environment we have mixed lustre 2.9, 2.10, 2.12, depend on HW age.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">we had some problems with 2.9 - 2.12.x with multihomed clients, but by tweaking lnet configs everything is working w/o problems.</div><div dir="auto">We stopped tracking client/server versions 😊.</div><div dir="auto">PS</div><div dir="auto">important point is we don't use logging and projects quotas.</div><div dir="auto"><br></div><div dir="auto"><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">Spitz, Cory James via lustre-discuss <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>> schrieb am Di., 30. März 2021, 19:55:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hello, Megan.<u></u><u></u></p>
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I was curious why you made this comment:<u></u><u></u></p>
<p class="MsoNormal">> A general example is a box with lustre-client 2.10.4 is not going to be completely happy with a new 2.12.x on the lustre network<u></u><u></u></p>
<p class="MsoNormal">In general, I think that the two LTS release are very interoperable. What incompatibility are you referring to? Do you have a well-known LU or two to share?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">-Cory<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:.5in">On 3/30/21, 12:14 PM, "lustre-discuss on behalf of Ms. Megan Larko via lustre-discuss" <<a href="mailto:lustre-discuss-bounces@lists.lustre.org" target="_blank" rel="noreferrer">lustre-discuss-bounces@lists.lustre.org</a> on behalf of
<a href="mailto:lustre-discuss@lists.lustre.org" target="_blank" rel="noreferrer">lustre-discuss@lists.lustre.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:.5in">Hello!<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:.5in">I have no direct experience with the DDN AI400X, but as a vendor DDN has some nice value-add to the Lustre systems they build. Having worked with other DDN Lustre hw in my career, interoperability with other Lustre
mounts is usually not an issue unless the current lustre-client software on the client boxes is a very different software version or network stack. A general example is a box with lustre-client 2.10.4 is not going to be completely happy with a new 2.12.x
on the lustre network. As far as vendor lock-in, DDN support in my past experience does have its own value-add to their Lustre storage product so it is not completely vanilla. I have found the enhancements useful. As far as your total admin control of the
DDN storage product, that is probably up to the terms of the service agreement made with purchase. My one experience with DDN on that is contractually DDN maintained the box version level and patches, standard Lustre tunables were fine for local admins.
In one case we did stumble upon a bug, I was permitted to dig around freely but not to change anything; I shared my findings with the DDN team. It worked out well for us.<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:.5in">P.S. I am not in any way employed or compensated by DDN. I'm just sharing my own experience. Smile.<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:.5in">Cheers,<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:.5in">megan<u></u><u></u></p>
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