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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Kevin, out of curiosity, what type of disk does your data pool use? SAS or just some SAN attached system?<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of "Buterbaugh, Kevin L" <Kevin.Buterbaugh@Vanderbilt.Edu><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Date: </b>Thursday, December 15, 2016 at 2:47 PM<br>
<b>To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject: </b>Re: [gpfsug-discuss] Tiers<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Mark, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We\u2019re a \u201ctraditional\u201d university HPC center with a very untraditional policy on our scratch filesystem \u2026 we don\u2019t purge it and we sell quota there. Ultimately, a lot of that disk space is taken up by stuff that, let\u2019s just say, isn\u2019t exactly
in active use.<o:p></o:p></p>
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<p class="MsoNormal">So what we\u2019ve done, for example, is buy a 60-bay storage array and stuff it with 8 TB drives. It wouldn\u2019t offer good enough performance for actively used files, but we use GPFS policies to migrate files to the \u201ccapacity\u201d pool based on
file atime. So we have 3 pools:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">1. the system pool with metadata only (on SSDs)<o:p></o:p></p>
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<p class="MsoNormal">2. the data pool, which is where actively used files are stored and which offers decent performance<o:p></o:p></p>
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<p class="MsoNormal">3. the capacity pool, for data which hasn\u2019t been accessed \u201crecently\u201d, and which is on slower storage<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would imagine others do similar things. HTHAL\u2026<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Kevin<o:p></o:p></p>
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<p class="MsoNormal">On Dec 15, 2016, at 2:32 PM, <a href="mailto:Mark.Bush@siriuscom.com">
Mark.Bush@siriuscom.com</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">Just curious how many of you out there deploy SS with various tiers? It seems like a lot are doing the system pool with SSD\u2019s but do you routinely have clusters
that have more than system pool and one more tier? <span class="apple-converted-space"> </span></span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">I know if you are doing Archive in connection that\u2019s an obvious choice for another tier but I\u2019m struggling with knowing why someone needs more than two tiers really.</span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">I\u2019ve read all the fine manuals as to how to do such a thing and some of the marketing as to maybe why. I\u2019m still scratching my head on this though. In fact, my
understanding is in the ESS there isn\u2019t any different pools (tiers) as it\u2019s all NL-SAS or SSD (DF150, etc).<span class="apple-converted-space"> </span></span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">It does make sense to me know with TCT and I could create an ILM policy to get some of my data into the cloud.</span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">But in the real world I would like to know what yall do in this regard.</span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">Thanks</span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri">Mark<span class="apple-converted-space"> </span></span><span style="font-family:Calibri"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:Calibri"> </span><span style="font-family:Calibri"><o:p></o:p></span></p>
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