[OmniOS-discuss] slog limits write speed more than it should

[Nicholas George]

>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.

http://nex7.blogspot.com/2013/04/zfs-intent-log.html
http://www.nexentastor.org/boards/5/topics/6179

On Wed, Nov 12, 2014 at 6:21 PM, Rune Tipsmark <rt at steait.net> wrote:

> http://www.fusionio.com/products/iodrive
>
> 160GB SLC
>
> -----Original Message-----
> From: Bob Friesenhahn [mailto:bfriesen at simple.dallas.tx.us]
> Sent: Wednesday, November 12, 2014 3:17 PM
> To: Rune Tipsmark
> Cc: omnios-discuss at lists.omniti.com
> Subject: Re: [OmniOS-discuss] slog limits write speed more than it should
>
> On Wed, 12 Nov 2014, Rune Tipsmark wrote:
> >
> > each SLOG device can easily handle much more than 6000 IOPS
>
> Where may we find the specifications for the SSDs you are using?
>
> 6000 IOPS sounds like it might be quite a lot, depending on the SSD used.
>
> Bob
> --
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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>
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