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<p class="MsoNormal">Connections on demand has been done and is not relevant here – It just idles unused connections to save resources, no impact on ability to write, etc.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Patrick<o:p></o:p></li></ul>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Alexander I Kulyavtsev <aik@fnal.gov><br>
<b>Date: </b>Tuesday, May 14, 2019 at 11:42 AM<br>
<b>To: </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] Stop writes for users<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><span style="font-size:12.0pt;color:black">There was feature request, and there were corresponding LU:<o:p></o:p></span></p>
<p><span style="font-family:"Tahoma",sans-serif;color:#212121">LU-5703 - Lustre quiesce</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p><span style="font-family:"Tahoma",sans-serif;color:#212121">LU-7236 - connections on demand</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Tahoma",sans-serif;color:#212121">Alex.</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Robert Redl <robert.redl@lmu.de><br>
<b>Sent:</b> Tuesday, May 14, 2019 10:36 AM<br>
<b>To:</b> lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> Re: [lustre-discuss] Stop writes for users</span><span style="font-size:12.0pt;color:black">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
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<p style="background:white"><span style="font-size:12.0pt;color:black">I don't know is this really works for this use case, but newer Lustre versions have the possibility to create a write barrier, which is normally part of the snapshot process.
<o:p></o:p></span></p>
<p style="background:white"><span style="font-size:12.0pt;color:black">Have a look at lctl barrier_freeze.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">On 5/14/19 5:25 PM, Mohr Jr, Richard Frank (Rick Mohr) wrote:<br>
<br>
<o:p></o:p></span></p>
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<pre style="background:white"><span style="color:black">On May 13, 2019, at 6:51 PM, Fernando Pérez <a href="mailto:fperez@icm.csic.es"><fperez@icm.csic.es></a> wrote:<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="background:white"><span style="color:black">Is there a way to stop file writes for all users or for groups without using quotes?<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="background:white"><span style="color:black">We have a lustre filesystem with corrupted quotes and I need to stop the write for all users (or for some users).<o:p></o:p></span></pre>
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<pre style="background:white"><span style="color:black">There are ways to deactivate OSTs, but those are intended to stop creation of new file objects on those OSTs and don’t actually stop writes to existing files. I don’t think that mounting OSTs read-only (with “mount -t lustre -o ro …”) works because Lustre updates some info when it mounts the target (but this might be based on old info so I could be wrong). You could remount all the clients read-only, but I don’t know if this is practical for you.<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="background:white"><span style="color:black">The only other option I can think of would be if there was a client-side parameter that could be set via “lctl conf_param” that might cause the clients to treat all the targets as read-only. But if there is such a parameter, I am not familiar with it.<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="background:white"><span style="color:black">--<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black">Rick Mohr<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black">Senior HPC System Administrator<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black">National Institute for Computational Sciences<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><a href="http://www.nics.tennessee.edu">http://www.nics.tennessee.edu</a><o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="background:white"><span style="color:black">_______________________________________________<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black">lustre-discuss mailing list<o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a><o:p></o:p></span></pre>
<pre style="background:white"><span style="color:black"><a href="http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org">http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org</a><o:p></o:p></span></pre>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">--
<o:p></o:p></span></p>
<p style="margin-bottom:12.0pt;background:white"><span style="font-size:10.0pt;color:gray">Dr. Robert Redl<br>
Scientific Programmer, "Waves to Weather" (SFB/TRR165)<br>
Meteorologisches Institut<br>
Ludwig-Maximilians-Universität München<o:p></o:p></span></p>
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