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Dear LQCD JLab compute and storage users,</div>
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The JLab Scientific Computing Operations team will be commencing the migration of data from existing /volatile and /cache filesystems to the new Lustre filesystem next week. The first migration will be followed by several sweeps to catch up on any subsequent
filesystem changes for the rest of the month.</div>
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Please take notice and action on my previous email (appended below) about small files (<1MB) since these
<u>will be excluded</u> in the data migration.</div>
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If you have any questions or concerns, please do not hesitate to email me directly.</div>
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<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;">Amitoj Singh</span><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(33, 33, 33);">, </span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 10pt; color: rgb(33, 33, 33);">HPC Architect</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 10pt; color: rgb(33, 33, 33);">High Performance Data Facility</span></p>
<p style="margin: 0in;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">Computational Sciences and Technology Division</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 10pt; color: rgb(33, 33, 33);">Thomas Jefferson National Accelerator Facility</span></p>
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<b>From: </b>Amitoj Singh <amitoj@jlab.org><br>
<b>Date: </b>Wednesday, January 14, 2026 at 11:05 AM<br>
<b>To: </b>lqcd-users@jlab.org <lqcd-users@jlab.org><br>
<b>Subject: </b>NOTICE: Migration of your data to a new Lustre file-system<br>
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<span style="text-transform: none;">Dear LQCD JLab compute and storage users,</span></div>
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As we get ready to deploy a new 4PB Lustre-filesystem based storage hardware we need to address the topic of migrating
<u>existing data with small files</u> from /volatile and /cache storage areas to the new filesystem. Small files are a performance killer for the Lustre filesystem and will slow down the data migration process and so we would like to take the opportunity to
bring this to your attention.</div>
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Small files are defined as files that have sizes less than 1MB.</div>
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As of now we plan to <u>not migrate any small files</u> to the new storage system. To mitigate this, we encourage everyone to please do the following:</div>
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<span style="text-transform: none;">Check your group/project small file count in /volatile and /cache using this following web pages ->
</span><span style="color: rgb(0, 120, 212); text-transform: none;"><a href="https://lqcd.jlab.org/lqcd/volatileDisk/project" title="https://lqcd.jlab.org/lqcd/volatileDisk/project" data-outlook-id="a0d1e037-d517-49fb-86e7-76e527be15a1" style="color: rgb(0, 120, 212);">link
to volatile</a></span><span style="text-transform: none;">, </span><span style="color: rgb(0, 120, 212); text-transform: none;"><a href="https://lqcd.jlab.org/lqcd/cacheDisk/project" title="https://lqcd.jlab.org/lqcd/cacheDisk/project" data-outlook-id="bf7cf255-2321-4d5f-bf41-79febda97ae7" style="color: rgb(0, 120, 212);">link
to cache</a></span></div>
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<span style="text-transform: none;">Do the following to reduce your small file count:</span></div>
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<span style="text-transform: none;">delete files that are no longer needed -OR-</span></div>
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<span style="text-transform: none;">compress small files into a single file -OR -</span></div>
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<span style="text-transform: none;">move small files to /work.</span></div>
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<span style="text-transform: none;">If you have any questions or concerns, please do not hesitate to email me directly.</span></div>
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<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;">Amitoj Singh</span><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(33, 33, 33);">, </span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(33, 33, 33);">HPC Architect</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(33, 33, 33);">High Performance Data Facility</span></p>
<p style="margin: 0in;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">Computational Sciences and Technology Division</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif;"><span style="font-family: Arial, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(33, 33, 33);">Thomas Jefferson National Accelerator Facility</span></p>
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