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<p class="MsoNormal"><span style="color:#1F497D">Hello!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> Thank you for your response… yes, that would be reasonable if trying to maintain a certain measure of contiguousness... but based on the way the Lustre FS handles file (block) allocation, I was
checking if there were differences in profiling to say a standard UFS-type file system.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Mike<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#0F243E">Mike Selway</span></b><b><span style="font-size:10.0pt;color:#A80000">
</span></b><b><span style="font-size:10.0pt;color:#365F91">|</span></b><b><span style="font-size:10.0pt;color:#595959"> Sr. Storage Architect (TAS) | Cray Inc.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#404040">Work</span><span style="font-size:10.0pt">
</span><span style="font-size:10.0pt;color:#595959">+1-301-332-4116 | mselway@cray.com<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#595959">146 Castlemaine Ct, Castle Rock, CO 80104|
<a href="http://www.cray.com/Products/Storage/Tiered-Adaptive-Storage.aspx"> Check out Tiered Adaptive Storage (TAS)!</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.0pt;color:#595959"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="http://www.cray.com/"><span style="color:#1F497D;text-decoration:none"><img border="0" width="143" height="17" id="_x0000_i1028" src="cid:image001.png@01D03099.3E5A01C0" alt="cid:image001.png@01CF36E5.85AF42A0"></span></a><span style="color:#1F497D"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Bob Ball [mailto:ball@umich.edu]
<br>
<b>Sent:</b> Wednesday, January 14, 2015 1:55 PM<br>
<b>To:</b> Mike Selway; lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> Re: [Lustre-discuss] Performance dropoff for a nearly full Lustre file system<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">In my memory, it is not recommended to run Lustre more than 90% full.
<br>
<br>
bob<o:p></o:p></p>
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<p class="MsoNormal">On 1/14/2015 2:43 PM, Mike Selway wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"> I’m looking for experiences for what has been observed to happen (performance drop offs, severity of drops, partial/full failures, …) when an operational Lustre File System has been almost “filled”… percentages of interest
are in the range from say 80% to 99%. Multiple responses appreciated.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Also, comments from anyone who has implemented a Robin Hood approach, about how they worked to avoid performance drop offs of a “near full” file system by “archiving and releasing data blocks” to auto-reconstruct continuous data areas.
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks!<br>
Mike<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#0F243E">Mike Selway</span></b><b><span style="font-size:10.0pt;color:#A80000">
</span></b><b><span style="font-size:10.0pt;color:#365F91">|</span></b><b><span style="font-size:10.0pt;color:#595959"> Sr. Storage Architect (TAS) | Cray Inc.</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#404040">Work</span><span style="font-size:10.0pt">
</span><span style="font-size:10.0pt;color:#595959">+1-301-332-4116 | <a href="mailto:mselway@cray.com">
mselway@cray.com</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#595959">146 Castlemaine Ct, Castle Rock, CO 80104|
<a href="http://www.cray.com/Products/Storage/Tiered-Adaptive-Storage.aspx"> Check out Tiered Adaptive Storage (TAS)!</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:6.0pt;color:#595959"> </span><o:p></o:p></p>
<p class="MsoNormal"><a href="http://www.cray.com/"><span style="color:#1F497D;text-decoration:none"><img border="0" width="143" height="17" id="Picture_x0020_1" src="cid:image001.png@01D03099.3E5A01C0" alt="cid:image001.png@01CF36E5.85AF42A0"></span></a><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="390" height="34" id="Picture_x0020_19" src="cid:image004.jpg@01D03099.3E5A01C0"><o:p></o:p></p>
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<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Lustre-discuss mailing list<o:p></o:p></pre>
<pre><a href="mailto:Lustre-discuss@lists.lustre.org">Lustre-discuss@lists.lustre.org</a><o:p></o:p></pre>
<pre><a href="http://lists.lustre.org/mailman/listinfo/lustre-discuss">http://lists.lustre.org/mailman/listinfo/lustre-discuss</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
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