Date: Tue, 26 Apr 2011 08:53:06 +0200 From: Federico Maggi <fmaggi@elet.polimi.it> To: "Freebsd-hardware@freebsd.org" <Freebsd-hardware@freebsd.org> Subject: Re: Known issues with ZFS on ICH10R (Intel G45)? Message-ID: <BANLkTinDE0KJYqQLBxTCoEj4HpjK-Va%2BPg@mail.gmail.com> In-Reply-To: <4D8F2C76.3010205@fuckner.net> References: <DF8EFC2D-DF46-4EF6-82BB-3CC015DEA0CD@gmail.com> <4D8F2C76.3010205@fuckner.net>
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Hi All,
On Sunday, March 27, 2011, Michael Fuckner <michael@fuckner.net> wrote:
> On 03/27/11 11:35, Maggi Federico wrote:
>> My only concern is the ICH10R SATA RAID controller. I've read that
>> ZFS likes full access to the disks, and that built-in RAID systems
>> (even if disabled) may lead to poor performances or, worst, errors.
> Hi,
>
> it can be configured in Bios either es plain AHCI or Raid (which is a firmware/driver raid, not something you expect when hearing the word "RAID"). Pick AHCI and everything is fine.
I've tested this machine on FreeBSD 8.2 (FreeNAS 0.8 RC5) and
assigned vm.kmem_size/vm.kmem_size_max=512M, plus other options as
suggested by the FreeBSD ZFS Tuning Guide. I put 4G of RAM and
currently installed a 32bit Celeron, while waiting for a 64bit to be
shipped.
I've been running some preliminary tests that turn out extremely
unsatisfactory. For example:
$ dd if=/dev/zero of=/mnt/data/test bs=2M
was able to reach 150MB/s (on RAIDZ, four 300MB/s-SATA HDs). Is there
something wrong on my testing or it's the SATA chipset driver support?
Also, the network transfer rate on a gigabit LAN are very poor as
well. For example, I've tried to scopy a 5GB-file and it didn't go
beyond 10MB/s in both directions.
Any suggestion is greatly appreciated.
Thanks!
-F
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