Re: [Scst-devel] Tuning scst windows and sw raid5

["Łukasz Oleś" <lukasz.oles@open-e.com>]

On Friday 22 of April 2011 16:19:48 you wrote:
> On Fri, Apr 22, 2011 at 9:08 AM, Łukasz Oleś <lukasz.oles@open-e.com> wrote:
> > Hi,
> > 
> > I'm trying to tune Software Raid5, SCST and Windows Initiator to get best
> > read/write performance.
> 
> My first recommendation is to stick with blockio due to the raid5
> write hole possibility when using software raid.
> 
> what windows version, and if not server2008, did you align the
> partitions? (there's a 2003 and a 2008 R2)
2008 R2

> dd is going to use the initiator OS's cache, make sure your test file
> size is 2x the ram in the initiator, if not the target too.
On initiator I have 2GB RAM and I'm copying 20GB file.

> Also xfs is much better at dealing with large files than ntfs.  Best
> apple to apples test is going to be on raw unformated partitions
What this test(testing on raw partitions) can tell me? In the end I have to 
use filesystem.

> I'm not familiar with BST5.  I typically use iometer for both OS's.
I will try it.

--
Lukasz Oles

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