RE: now on to tuning....

Good point about maxing out the pci bus... - I already use the nForce for mirrored boot drives, so that's not an option. The IDE controllers are empty at the moment (save for a DVD drive); I will give this a thought.

Thanks for the feedback,

-P

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org]On Behalf Of Nicola Fankhauser
Sent: Wednesday, March 09, 2005 10:48 AM
To: linux-raid@vger.kernel.org
Subject: Re: now on to tuning....


hi peter

peter.greis@ubs.com wrote:

I have been lurking for a while.... I recently put together a raid 5
system (Asus K8NE SIL 3114/2.6.8.1 kernel) with 4 300GB SATA Seagate
drives (a lot smaller than the bulk of what seems to be on this
list!). Currently this is used for video and mp3 storage, being
Reiser on LVM2.

beware that LVM2 _can_ affect your performance. I too believed that the 
concept of dynamic drives is good, but I experienced a performance hit 
of about 50% (especially in sequential reads).

see my blog entry describing how I built my 2TB file-server at 
http://variant.ch/phpwiki/WikiBlog/2005-02-27 for some numbers and more 
explanation.

the K8NE has the same SiI 3114 controller as the board I used has; it is 
connected by a 33mhz 32bit PCI bus and maxes out at 133MiB/s, so for 
maxmimum performance you might want to connect only two drives to this 
controller, the other two to the nforce3 chipset SATA ports.

Bonnie++ to test, but with which parameters ? 

normally it's enough to specify a test-file larger (e.g. twice) the 
memory capacity of the machine you are testing. for a machine with 1GiB RAM:

# bonnie++ -s 2gb {other options}

you might as well want to specify the "fast" option which skips per-char 
operations (which are quite useless to test IMHO):

# bonnie++ -f {other options}

HTH
nicola
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