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<p class="MsoNormal"><span style="color:#1F497D">Not sure if it’s expected but for reference here are some numbers from my two pools, the drives are Seagate ST4000NM0023, controllers is LSI 9207-4i4e<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> NAME STATE READ WRITE CKSUM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> pool01 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="DE" style="color:#1F497D">mirror-0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C50055FC9533d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C50055FE6A63d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> mirror-1 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C5005708296Fd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C5005708351Bd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> </span><span style="color:#1F497D">mirror-2 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c1t5000C500570858EFd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c1t5000C50057085A6Bd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> logs<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c9d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> cache<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c7d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c11d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">root@zfs10:~# time dd if=/dev/zero of=/pool02/dd.tst bs=1024000 count=20000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">20000+0 records in<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">20000+0 records out<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">20480000000 bytes (20 GB) copied, 50.6698 s, 404 MB/s<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">And the other pool<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> NAME STATE READ WRITE CKSUM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><span lang="DE" style="color:#1F497D">pool02 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> mirror-0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C50057086307d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C50057086B67d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> mirror-1 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C500570870D3d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> c1t5000C50057089753d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="color:#1F497D"> </span><span style="color:#1F497D">logs<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c10d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> cache<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c12d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c8d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">root@zfs10:~# time dd if=/dev/zero of=/pool01/dd.tst bs=1024000 count=20000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">20000+0 records in<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">20000+0 records out<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">20480000000 bytes (20 GB) copied, 50.2413 s, 408 MB/s<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Maybe try creating a pool from disks on one of the controllers and test.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#878787">Venlig hilsen / Best regards,</span><span style="font-size:10.0pt;color:#1F497D"><br>
</span><span style="font-size:10.0pt;color:#878787">Rune Tipsmark</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D"><br>
<br>
</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> OmniOS-discuss [mailto:omnios-discuss-bounces@lists.omniti.com]
<b>On Behalf Of </b>Matthew Lagoe<br>
<b>Sent:</b> Friday, May 16, 2014 9:15 PM<br>
<b>To:</b> omnios-discuss@lists.omniti.com<br>
<b>Subject:</b> [OmniOS-discuss] Slow write performance<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I have a system that I am building, 2 x E5-2620 with 3 x LSI 9207-8e one drive from each mirror plugged into one HBA, configuration is below<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">On reads I get about 653 MB/s (which is great) and writes 263 MB/s<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">A single drive gets around 120MB/s read and 90MB/s write and is a ST3000NM0023 sas Seagate I would assume write performance should go up with number of vdev’s however it seems to only increase by ~60%.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Is this expected?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> NAME STATE READ WRITE CKSUM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> tank ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> mirror-0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057B946C7d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057B9792Bd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057BA72B3d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> mirror-1 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057BA7F0Bd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057BFA69Bd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057C1A177d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> mirror-2 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50057C3CDF3d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C5005815632Fd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C5005815650Fd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> mirror-3 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C5005817ECF7d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C50058185583d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C500581C8397d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> mirror-4 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C500581CB967d0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C500581CD21Bd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> c4t5000C500581F147Fd0 ONLINE 0 0 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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