On Fri, May 27, 2011 at 2:49 PM, Marty Scholes <martyscho...@yahoo.com> wrote:
> For what it's worth, I ran a 22 disk home array as a single RAIDZ3 vdev
> (19+3)for several
> months and it was fine. These days I run a 32 disk array laid out as four
> vdevs, each an
> 8 disk RAIDZ2, i.e. 4x 6+2.
I tested 40 drives in various configurations and determined that
for random read workloads, the I/O scaled linearly with the number of
vdevs, NOT the number of drives. See
https://spreadsheets.google.com/a/kraus-haus.org/spreadsheet/pub?hl=en_US&hl=en_US&key=0AtReWsGW-SB1dFB1cmw0QWNNd0RkR1ZnN0JEb2RsLXc&output=html
for results using raidz2 vdevs. I did not test sequential read
performance here as our workload does not include any.
--
{--------1---------2---------3---------4---------5---------6---------7---------}
Paul Kraus
-> Senior Systems Architect, Garnet River ( http://www.garnetriver.com/ )
-> Sound Coordinator, Schenectady Light Opera Company (
http://www.sloctheater.org/ )
-> Technical Advisor, RPI Players
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