`<div dir="ltr">From what I understand, ZFS writes to the intent log in a single threaded synchronous fashion. Adding three drives just means that the first block is written to the first drive synchronously, then the second block to the second drive synchronously, then the third to the third drive and then back around to the first. You don't actually increase your throughput beyond the performance of a single drive.<br><br><a href="http://nex7.blogspot.com/2013/04/zfs-intent-log.html">http://nex7.blogspot.com/2013/04/zfs-intent-log.html</a><br><a href="http://www.nexentastor.org/boards/5/topics/6179">http://www.nexentastor.org/boards/5/topics/6179</a><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 12, 2014 at 6:21 PM, Rune Tipsmark <span dir="ltr"><<a href="mailto:rt@steait.net" target="_blank">rt@steait.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><a href="http://www.fusionio.com/products/iodrive" target="_blank">http://www.fusionio.com/products/iodrive</a><br>
<br>
160GB SLC<br>
<div class="HOEnZb"><div class="h5"><br>
-----Original Message-----<br>
From: Bob Friesenhahn [mailto:<a href="mailto:bfriesen@simple.dallas.tx.us">bfriesen@simple.dallas.tx.us</a>]<br>
Sent: Wednesday, November 12, 2014 3:17 PM<br>
To: Rune Tipsmark<br>
Cc: <a href="mailto:omnios-discuss@lists.omniti.com">omnios-discuss@lists.omniti.com</a><br>
Subject: Re: [OmniOS-discuss] slog limits write speed more than it should<br>
<br>
On Wed, 12 Nov 2014, Rune Tipsmark wrote:<br>
><br>
> each SLOG device can easily handle much more than 6000 IOPS<br>
<br>
Where may we find the specifications for the SSDs you are using?<br>
<br>
6000 IOPS sounds like it might be quite a lot, depending on the SSD used.<br>
<br>
Bob<br>
--<br>
Bob Friesenhahn<br>
<a href="mailto:bfriesen@simple.dallas.tx.us">bfriesen@simple.dallas.tx.us</a>, <a href="http://www.simplesystems.org/users/bfriesen/" target="_blank">http://www.simplesystems.org/users/bfriesen/</a><br>
GraphicsMagick Maintainer, <a href="http://www.GraphicsMagick.org/" target="_blank">http://www.GraphicsMagick.org/</a><br>
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