<div dir="ltr"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 16, 2021 at 9:46 AM Kurt Strosahl <<a href="mailto:strosahl@jlab.org">strosahl@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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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></div></blockquote><div><div><br></div><div>Kurt,</div><div><br></div><div>That behavior you describe sounds a bit like issues reported on this list a while back:</div><div><br></div><div>Data migration from one OST to anther<br></div><div><a href="http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2019-March/016304.html">http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2019-March/016304.html</a><br></div><div><br></div><div>Migrating files doesn't free space on the OST<br></div><div><a href="http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2019-January/016196.html">http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2019-January/016196.html</a><br></div><div><br></div><div>I thought that those problems were addressed in more recent versions of Lustre though. Perhaps someone else can verify that. You aren't running a very old version, are you?</div><div><br></div><div>Hope this helps,</div><div>Nathan</div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);background-color:rgb(255,255,255)"><hr style="font-family:Arial,Helvetica,sans-serif;font-size:small;color:rgb(34,34,34);display:inline-block;width:98%"><br></div><div><div id="gmail-m_-7503699948594574318divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Iannetti, Gabriele <<a href="mailto:G.Iannetti@gsi.de" target="_blank">G.Iannetti@gsi.de</a>><br>
<b>Sent:</b> Tuesday, February 16, 2021 10:02 AM<br>
<b>To:</b> Kurt Strosahl <<a href="mailto:strosahl@jlab.org" target="_blank">strosahl@jlab.org</a>>; <a href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.org</a> <<a href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.org</a>><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>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 <<a href="mailto:lustre-discuss-bounces@lists.lustre.org" target="_blank">lustre-discuss-bounces@lists.lustre.org</a>> on behalf of Kurt Strosahl <<a href="mailto:strosahl@jlab.org" target="_blank">strosahl@jlab.org</a>><br>
Sent: Thursday, February 11, 2021 16:51<br>
To: <a href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.org</a><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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