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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hello Kurt,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">max_create_count is a tunable per OST. It controls how many object pre-creations could be done on each OST, by the MDT. If you set this to 0 for one OST, no additional object will be
allocated there and no new file will have file stripes on it.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">With the appropriate hardware, Lustre can create much more than 20,000 files simultaneously.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Aurélien<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><b><span style="font-size:12.0pt;color:black">De :
</span></b><span style="font-size:12.0pt;color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> au nom de Kurt Strosahl <strosahl@jlab.org><br>
<b>Date : </b>mercredi 19 juin 2019 à 22:43<br>
<b>À : </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Objet : </b>[lustre-discuss] a question about max_create_count<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black">Good Afternoon,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black"> I'm in the process of testing a new lustre file system at 2.12, and in going through the documentation I saw that to stop writes from going to the system we now set
the max_create_count to 0 on the mdt.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black"> I looked at that value on my system and the default seems to be 20000, am I correct in thinking that this is the maximum number of simultaneous creates that can happen
on an OST?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-size:12.0pt;color:black">w/r,<o:p></o:p></span></p>
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<p style="margin-left:35.4pt"><span style="font-size:10.5pt;font-family:"Courier New";color:#333333">Kurt J. Strosahl<br>
System Administrator: Lustre, HPC<br>
Scientific Computing Group, Thomas Jefferson National Accelerator Facility</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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