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During a maintenance window today I revooted the OSS that OST had been mounted on, after it came up the usage dropped significantly</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size: 11pt;"><b>From:</b> Iannetti, Gabriele <G.Iannetti@gsi.de><br>
<b>Sent:</b> Tuesday, February 16, 2021 10:02 AM<br>
<b>To:</b> Kurt Strosahl <strosahl@jlab.org>; lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org><br>
<b>Subject:</b> [EXTERNAL] Re: Disabling max creates and migrating data doesn't seem to be reducing the usage on an OST</font>
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<div class="PlainText">Hi Kurt,<br>
<br>
one more thing...<br>
<br>
The I-Node count should not increase, since new files should not be created on that OST.<br>
You can check the I-Node count with `lfs df -i | grep "\[OST:15\]"`.<br>
<br>
Modifications on existing files are still possible e.g. file increases in it's size...<br>
<br>
~Gabriele<br>
<br>
________________________________________<br>
From: lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Kurt Strosahl <strosahl@jlab.org><br>
Sent: Thursday, February 11, 2021 16:51<br>
To: lustre-discuss@lists.lustre.org<br>
Subject: [lustre-discuss] Disabling max creates and migrating data doesn't seem to be reducing the usage on an OST<br>
<br>
Good Morning,<br>
<br>
One of the OSTs in a lustre file system I manage is showing a higher usage. I attempted to stop writes by setting the max_create_count to zero and then moving data off it but that doesn't seem to be working.<br>
<br>
> lfs df | grep OST:15lustre19-OST000f_UUID 71145018368 62653382656 8491631616 89% /lustre19[OST:15]<br>
<br>
MDS> lctl set_param osp.lustre19-OST000f*.max_create_count=0<br>
MDS> lctl get_param osp.lustre19-OST000f*.max_create_count<br>
losp.lustre19-OST000f-osc-MDT0000.max_create_count=0<br>
<br>
lfs find /lustre19/expphy/volatile --ost lustre19-OST000f -size +50M | lfs_migrate -y<br>
<br>
I've been watching it, and the ost in question isn't shrinking. I can see its size usage go down a bit... and then tick up a bit<br>
<br>
w/r,<br>
<br>
Kurt J. Strosahl<br>
System Administrator: Lustre, HPC<br>
Scientific Computing Group, Thomas Jefferson National Accelerator Facility<br>
<br>
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