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Date: Wed, 09 Jul 2008 00:41:11 +0200
From: Kris Kennaway <kris@FreeBSD.org>
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Cc: freebsd-fs@freebsd.org
Subject: Re: Thinking of using ZFS/FBSD for a backup system
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Kris Kennaway wrote:
> mike wrote:
>> On 7/8/08, Randy Bush <randy@psg.com> wrote:
>>
>>> <sigh>.  first cuppa.  it's 4g
>>
>> okay, so it sounds like from multiple people this could be doable and
>> stable enough:
>>
>> dual or quad-core current gen processor (amd64)
>> 4g ram
>> 4 or 6x 1tb disks
>> freebsd 7.0-release
>>
>> these tweaks to /boot/loader.conf:
>>
>> vm.kmem_size=600M
>> vm.kmem_size_max=600M
>> vfs.zfs.prefetch_disable=1
>>
>> right?
> 
> Might be enough kmem, if not, or if you want better performance from 
> increased caching, increase as high as 1500M
> 
> Kris
> 
> 

Also test with/without prefetch to see which is faster on your workload.

Kris