<div dir="ltr">Sorry, both seem to be SMR drives. My bad.<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 13, 2021 at 9:57 PM Vedant Lath <<a href="mailto:vedant@lath.in">vedant@lath.in</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><font color="#000000">ST2000LM015 is an SMR drive while WD20SPZX is a CMR drive - that explains the large IOPS differences.<br></font></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 13, 2021 at 2:44 AM Kent Watsen <<a href="mailto:kent%2Bsmartmontools@watsen.net" target="_blank">kent+smartmontools@watsen.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><br><div><blockquote type="cite"><div><div><div><blockquote type="cite"><div><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">> Is this level of variability normal?<br>
> Should I return all the WD drives?<br></blockquote><div><br></div><div><div>You can register your purchased WD drives at Western Digital (<a href="https://support-en.wd.com/app/account/dashboard" target="_blank">https://support-en.wd.com/app/account/dashboard</a>).</div><div>When done, you can open a support case whether or not this is to be expected. And ask for the reasons. <br></div></div></div></div></div></blockquote><div><br></div>Good idea - done! (Hopefully not a new spam vector)</div><div><br></div><div><br><blockquote type="cite"><div><div dir="ltr"><div class="gmail_quote"><div><div>And then share with us please ;-)</div></div></div></div></div></blockquote><div><br></div>Will do!</div></div></div></blockquote><div><br></div><div><br></div></div>My first response from WD was:<div><br></div><blockquote style="margin:0px 0px 0px 40px;border:medium none;padding:0px"><div>I really apologize for the delayed response. Upon discussing this case with the senior team, they wanted you to run diagnostics using data lifeguard software. If you still unhappy with the drives then we can get it replaced.</div></blockquote><div><br></div>However, after pointing out that I don’t have a Windows or Mac computer to test against and also that the question isn’t whether the drives are functioning properly, but *why* the SMART test times vary so wildly for drives having the same model-number, and if these test-time numbers are normal, the response I received was:<br><div><br></div><blockquote style="margin:0px 0px 0px 40px;border:medium none;padding:0px"><div>Thank you for your continued response. We can only comment on the behalf of our tools and our tools (Windows data life guard diagnostics) only run on windows and we do not have any information about Solaris. </div></blockquote><br><div>That said, using `fio` to test the performance of the various drives, I found that both the WD20SPZX drives outperformed the <font color="#000000">ST2000LM015. The results below only show the “write” test results because the ZFS L2ARC cache validates the “read” values. Note that, in all cases, the ZFS pool contains just the single drive.</font></div><div><br></div><div><br></div><div><div><span style="white-space:pre-wrap"> </span>• For a Seagate Barracuda (ST2000LM015) drive, which had a 330 minute long-test wait time:</div><div><span style="white-space:pre-wrap"> </span>• 4k<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=24, BW=97.6KiB/s (99.9kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=21, BW=85.2KiB/s (87.2kB/s)</div><div><span style="white-space:pre-wrap"> </span>• 64k:<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=12, BW=785KiB/s (804kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=12, BW=788KiB/s (807kB/s)</div><div><span style="white-space:pre-wrap"> </span>• 1m:<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=9, BW=9439KiB/s (9665kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=9, BW=9930KiB/s (10.2MB/s)</div><div><br></div><div><span style="white-space:pre-wrap"> </span>• For a WD Blue (WDC WD20SPZX-75U Revision: 6712) drive, which had a 737 minute long-test wait time:<br></div><div><span style="white-space:pre-wrap"> </span>• 4k<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=33, BW=136KiB/s (139kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=34, BW=137KiB/s (140kB/s)</div><div><span style="white-space:pre-wrap"> </span>• 64k:<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=34, BW=2207KiB/s (2260kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=34, BW=2215KiB/s (2268kB/s)</div><div><span style="white-space:pre-wrap"> </span>• 1m:<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=34, BW=34.5MiB/s (36.1MB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=35, BW=35.6MiB/s (37.3MB/s)</div><div><br></div><div><span style="white-space:pre-wrap"> </span>• For a WD Blue (WD20SPZX-22U Revision: 1A01) drive, which had a 119 minute long-test wait time:</div><br><div><span style="white-space:pre-wrap"> </span>• 4k<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=34, BW=138KiB/s (141kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=35, BW=141KiB/s (145kB/s)</div><div><span style="white-space:pre-wrap"> </span>• 64k:<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=35, BW=2248KiB/s (2302kB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=34, BW=2191KiB/s (2243kB/s)</div><div><span style="white-space:pre-wrap"> </span>• 1m:<br></div><div><span style="white-space:pre-wrap"> </span>• Random write: IOPS=34, BW=34.4MiB/s (36.1MB/s)</div><div><span style="white-space:pre-wrap"> </span>• Sequential write: IOPS=35, BW=35.4MiB/s (37.1MB/s)</div></div><div><br></div><div><br></div><div>These results muddy any coarse of action. Perhaps the <font color="#000000">WD20SPZX-22U drives (from NewEgg) are best, having both better performance and smaller “long-test” wait times. If I could do it over again, I might buy all 10 drives from NewEgg in 5 separate orders (containing two drives each) spaced a few days apart. But, as it stands, I’ll just hold onto what I got and live with the crazy-long test times on the </font><span style="color:rgb(0,0,0)">WD20SPZX-75U drives.</span></div><div><span style="color:rgb(0,0,0)"><br></span></div><div><font color="#000000"><span>Thanks all for your comments.</span></font></div><div><font color="#000000"><span><br></span></font></div><div><span style="color:rgb(0,0,0)">Kent</span></div><div><span style="color:rgb(0,0,0)"><br></span></div><div><br></div><div><br></div></div>_______________________________________________<br>
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