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<p>JC,</p>
<p>The message where it asks if the MGS is running is a pretty
common error that you'll see when something isn't right. There's
not a lot of detail in your message but first step is to make sure
your OST device is present on the OSS server. You mentioned
remounting the RAID directories; is this software/MD RAID? Are you
using ldiskfs or ZFS for the backend storage (I'll guess ldiskfs
if using MD RAID). <br>
</p>
<p>If you've already verified the OST volume is present, see if you
can 'lctl ping' between the MDS and OSS nodes. I'm not sure what
your knowledge base is so forgive me if this is too elementary,
but on each node, type 'lctl list_nids' to get the Lustre node
identifier, then run 'lctl ping <NID>' to make sure you can
talk Lustre/LNet between them:</p>
<pre>[root@tin1:~]# lctl list_nids
192.168.101.1@o2ib1
[root@tin6:~]# lctl list_nids
192.168.101.6@o2ib1
[root@tin6:~]# lctl ping 192.168.101.1@o2ib1
12345-0@lo
12345-192.168.101.1@o2ib1
[root@tin1:~]# lctl ping 192.168.101.6@o2ib1
12345-0@lo
12345-192.168.101.6@o2ib1
</pre>
<p>If you get a failure (like I/O Error), then you have a
communications problem and you'll want to make sure all the
correct interfaces are up. If the pings do work, then you'll want
to look for messages in /var/log/lustre and dmesg.</p>
<p>Cameron<br>
</p>
<div class="moz-cite-prefix">On 8/9/22 06:45, Crowder, Jonathan via
lustre-discuss wrote:<br>
</div>
<blockquote type="cite" cite="mid:DM5P118MB01858D3FE4C9B7AD828CB280E8629@DM5P118MB0185.NAMP118.PROD.OUTLOOK.COM">
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<p class="MsoNormal">Hello, this is my first post here so I may
need some guidance on the function of this system.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am in a small team supporting some 36TB
lustre servers for a business unit. Our configuration per
mount point is one lustre master node and 3 lustre object
stores. We had one of the object stores lost to an
unidentified reboot and upon getting it booted back into the
lustre kernel by azure cloud teams, we saw behavior where we
could not get it to remount the raid directories for storage
to the local file paths we have set up for them. I can obtain
the output soon here, it knows the MGS node, but asks if it's
running. I am having difficulty investigating more deeply into
why this is happening as the other object stores are working
without issue.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">JC<o:p></o:p></p>
<br>
<p class="msipfooter1a2dc593" style="margin:0" align="Left"><span style="font-size:10.0pt;font-family:Calibri;color:#000000">Internal</span></p>
</div>
<br>
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</pre>
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