ZFS - benchmark & tuning before and after doubling RAM

Charles Sprickman spork at bway.net
Sat Jan 8 22:11:24 UTC 2011

On Sat, 8 Jan 2011, Dan Langille wrote:

> I've been running a ZFS array for about 10 months on a system with 4GB of 
> RAM.  I'm about to add another 4GB of RAM.
> I think this might be an opportune time to run some simple benchmarks and do 
> some tuning.  Getting more out of the system is not a priority for me.  It 
> does what I need now.  However, I do see some merit in writing something up 
> for others to see/follow/learn.
> The system is running FreeBSD 8.2-PRERELEASE #1: Tue Nov 30 22:07:59 EST 2010 
> on a 64 bit box.  The ZFS array consists of 7x2TB commodity drives on two 
> SiI3124 SATA controllers.  The OS runs off a gmirror RAID-1.
> More details here: http://www.freebsddiary.org/zfs-benchmark.php
> First, up, I've done a simple bonnie++ benchmark before I add more RAM.  I 
> ran this on two different datasets; one with compression enabled, one 
> without.
> If anyone has suggestions for various tests, option settings, etc, I'm happy 
> to run them and include the results.  We have lots of time to play with this.

iozone is interesting.  I bought the excel plugin from the developer to 
generate the nice 3D graphs.  I'd love to put some of my graphs up 
somewhere for comparison...  It's a very time-consuming test though.


> -- 
> Dan Langille - http://langille.org/
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