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<div dir="ltr">Suggest you reach out to your local IBm team and ask them to put you in touch with the flash system performance testing / development team
<a rel="noreferrer noopener" id="OWAAM422753" href="mailto:barry.whyte@nz1.ibm.com">@BARRY WHYTE</a>, @andrew Martin, @evelin Perez <span></span><span></span><span></span></div>
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<div dir="ltr">Barry is in Europe for TechXChange roadshow atm so not sure what his response times will be like, </div>
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<div dir="ltr">But for the record, there are reasons why IBM won't commit to performance benchmarks for Scale filesystems on anything other than Scale Storage System / Elastic Storage System<span> building blocks.</span></div>
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<div dir="ltr"><span>At a high level I suspect your probably bumping into Draid overheads as well as the bandwidth limitations of the SAS storage adapters for the expansion shelves.</span></div>
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<div dir="ltr"><span>Just because the drives have a raw performance number does not mean<span> that it's 100% usable. </span></span></div>
<div dir="ltr"><span><span>Flash system performance team will be able to advise more accurately.<span></span></span></span></div>
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<div dir="ltr"><span><span>Regards,</span></span></div>
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<div dir="ltr">AJ</div>
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Regards,</div>
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Andrew Beattie</div>
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Technical Sales Specialist - Storage for Big Data & AI</div>
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IBM Australia and New Zealand</div>
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P. +61 421 337 927</div>
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E. abeattie@au1.ibm.com</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org> on behalf of Petr Plodík <petr.plodik@mcomputers.cz><br>
<b>Sent:</b> Wednesday, January 24, 2024 12:04:19 AM<br>
<b>To:</b> gpfsug-discuss@gpfsug.org <gpfsug-discuss@gpfsug.org><br>
<b>Subject:</b> [EXTERNAL] [gpfsug-discuss] IBM Flashsystem 7300 HDD sequential write performance issue</font>
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<div class="PlainText">Hi, <br>
<br>
we have GPFS cluster with two IBM FlashSystem 7300 systems with HD expansion and 80x 12TB HDD each (in DRAID 8+P+Q), 3 GPFS servers connected via 32G FC. We are doing performance tuning on sequential writes to HDDs and seeing suboptimal performance. After several
tests, it turns out, that the bottleneck seems to be the single HDD write performance, which is below 40MB/s and one would expect at least 100MB/s.<br>
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Does anyone have experiences with IBM flashsystem sequential write performance tuning or has these arrays in the infrastructure? We would really appreciate any help/explanation.<br>
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Thank you!<br>
<br>
Petr Plodik<br>
M Computers s.r.o.<br>
petr.plodik@mcomputers.cz<br>
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