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<p class="MsoNormal"><span style="font-size:11.0pt">Nobody on this topic?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I'm pretty sure they are lots of people running Lustre on ZFS with various tuning applied. Don't be shy
</span><span style="font-size:11.0pt;font-family:"Apple Color Emoji"">😉</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="color:black">De : </span></b><span style="color:black">"Degremont, Aurelien" <degremoa@amazon.com><br>
<b>Date : </b>mercredi 10 juillet 2019 à 10:35<br>
<b>À : </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Objet : </b>ZFS tunings</span><span style="color:black;mso-fareast-language:FR"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR">Hi all,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR">I know good default tunings for ZFS when used with Lustre is a big topic. There are several pages on wiki or LUG/LAD slides which are few years old and it is difficult to
know which ones are still relevant when used with recent Lustre and ZFS versions.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR">Does anybody have insight about which tunings are important. Especially for:</span><o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo3"><span style="font-size:11.0pt;mso-fareast-language:FR">zfs atime (does DMU when used by Lustre also updates atime ?)</span><o:p></o:p></li><li class="MsoListParagraph" style="color:black;mso-list:l0 level1 lfo3"><span style="font-size:10.0pt;font-family:"Courier New"">redundant_metadata=most</span><o:p></o:p></li><li class="MsoListParagraph" style="color:black;mso-list:l0 level1 lfo3"><span style="font-size:10.0pt;font-family:"Courier New"">metaslab_debug_unload=1</span><o:p></o:p></li><li class="MsoListParagraph" style="color:black;mso-list:l0 level1 lfo3"><span style="font-size:10.0pt;font-family:"Courier New"">zfs_prefetch_disable=1</span><o:p></o:p></li><li class="MsoListParagraph" style="color:black;mso-list:l0 level1 lfo3"><span style="font-size:10.0pt;font-family:"Courier New"">zfs_vdev_scheduler=deadline</span><o:p></o:p></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR">Lustre already sets ‘xattr=sa’, ‘dnodesize=auto’ and ‘recordsize=1M’ automatically since Lustre 2.11.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR">Thanks</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:FR">Aurélien</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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