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Shawn,<br>
<div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Lustre handles the largest filesystems in the world, hundreds of PB in size, so t</span>here are definitely Lustre filesystems with hundreds of servers. </div>
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<div>In large storage clusters the servers failover in pairs or quads, since the storage is typically not on a single global SAN for all nodes to access, so there is definitely not a single huge HA cluster for all of the servers in the filesystem.<br>
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<div dir="ltr">Cheers, Andreas</div>
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<blockquote type="cite">On Jul 21, 2023, at 16:09, Shawn via lustre-discuss <lustre-discuss@lists.lustre.org> wrote:<br>
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<div dir="ltr">Hi Laura, thanks for your reply.
<div>It seems the OSSs will share the disks created from a shared SAN. So the OSS-pairs can failover in a pre-defined manner if one node is down, coordinated by a HA manager.</div>
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<div>This can certainly work on a limited scale. I'm curious if this static schema can scale to a large cluster with 100s of OSSs servers?</div>
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<div>regards,</div>
<div>Shawn</div>
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<div dir="ltr" class="gmail_attr">On Tue, Jul 18, 2023 at 1:25 PM Laura Hild <<a href="mailto:lsh@jlab.org">lsh@jlab.org</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I'm not familiar with using FLR to tolerate OSS failures. My site does the HA pairs with shared storage method. It's sort of described in the manual<br>
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<a href="https://doc.lustre.org/lustre_manual.xhtml#configuringfailover" rel="noreferrer" target="_blank">
https://doc.lustre.org/lustre_manual.xhtml#configuringfailover</a><br>
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but in more, Pacemaker-specific detail at<br>
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<a href="https://wiki.lustre.org/Creating_a_Framework_for_High_Availability_with_Pacemaker" rel="noreferrer" target="_blank">
https://wiki.lustre.org/Creating_a_Framework_for_High_Availability_with_Pacemaker</a><br>
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and<br>
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<a href="https://wiki.lustre.org/Creating_Pacemaker_Resources_for_Lustre_Storage_Services" rel="noreferrer" target="_blank">
https://wiki.lustre.org/Creating_Pacemaker_Resources_for_Lustre_Storage_Services</a><br>
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