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From: Jonathan Belson <jon@witchspace.com>
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Cc: freebsd-stable@freebsd.org, Michael Loftis <mloftis@wgops.com>
Subject: Re: More zfs benchmarks
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On 14 Feb 2010, at 21:15, Joshua Boyd wrote:

> Repeated the same tests on my AMD64 dual core 4GB system with 5 =
HD103SI 1T
> drives in raidz1 on a Supermicro PCI-E controller, running 8-STABLE.

[ snip results ]

I was hoping I'd get something closer to these figures...

> Here are my relevant settings:
>=20
> vfs.zfs.prefetch_disable=3D0
> vfs.zfs.zil_disable=3D"1"

I already had prefetch disabled, but retrying with zil disabled made no =
difference.

What is your arc_min and arc_max set to?

>=20
> On Sun, Feb 14, 2010 at 3:34 PM, Michael Loftis <mloftis@wgops.com> =
wrote:
>>>=20
>> You really need to test with at least 4GB of data, else you're just =
testing
>> caching speeds on writing.  Use a test suite like bonnie++ and you'll =
see

I'd expect to get more than 4MB/s if I was just measuring cache speed =
:-)

Cheers,

--Jon