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<p class="MsoNormal">-Eugene<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Clas12_software <clas12_software-bounces@jlab.org>
<b>On Behalf Of </b>Nathan Baltzell<br>
<b>Sent:</b> Monday, January 13, 2020 20:15<br>
<b>To:</b> clas12 software <clas12_software@jlab.org>; CLAS-OFFLINE <clas_offline@jlab.org>; HPS-SOFTWARE <hps-software@slac.stanford.edu>; prad@jlab.org<br>
<b>Subject:</b> [Clas12_software] preparations for new Hall B /volatile<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">Hello Everyone,</span>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">JLab's Scicomp is almost ready to switch Hall-B's Lustre filesystems at /volatile to new hardware, which should give us a *very* significant increase in disk space.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">However, the proposed transition will not be completely transparent to users with existing data on /volatile. See below for details.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">The earliest possible date for this is January 16, Thursday of this week. The next option would be next Tuesday, January 20, after the long weekend.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">This transition ideally applies to all these, and everything they contain, in one shot:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">/volatile/clas12<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">/volatile/hallb<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">/volatile/clas<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">The proposed transition minimizes downtime and system overhead, but will *not* automatically replicate anyone's existing /volatile data to the new filesystem:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">1. The old /volatile directories above will be renamed/remounted as /volatile-old (or a similar name), become *read-only*, and remain readable for ~one month (similar
to our current lifetime on /volatile).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">2. The new /volatile filesystem will replace the old one, with all quota-level directories and permissions replicated, but sub-directories left to us to recreate
as needed.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">3. We can then copy data from /volatile-old to /volatile if we want to, or leave it there (and keep reading it) until it is deleted in a ~month.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">I'm not aware of any production accounts currently running long batch workflows using /volatile. It will be good to minimize this transition's impact (and get
a huge increase in disk space), so please let me know if you have any considerations, concerns, etc about this.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">There will be a followup email with the final date and details ...<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo-Regular",serif;color:black">Nathan<o:p></o:p></span></p>
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