Re: [Xen-users] Re: Windows Disk performance

[Ruslan Sivak <russ@xxxxxxxxxx>]

Grant McWilliams wrote:
>     Which 3ware is this and what RAID mode with how many disks are you
>     using?
>     Unless you are running some RAID0 on multiple 10k SAS disks I
>     doubt that 350MBytes/s is anywhere near the actual throughput.
>
>
>     Best regards,
>       Christian
>
>
> Even then it's not, I have a RAID 0 with 8 10k rapters on a 3ware 
> controller and get nowhere near that even with all the optimizations 
> turned on. It's probably out of cache.
> Grant
Which 3ware controller,  which raptors, and what kind of speeds are you 
getting?
I noticed that I seemed to be actually getting better speeds off 500GB 
7200 WD's then I was getting off 300GB 10k Velociraptors.  I think it's 
mostly due to the fact that 500GB drives pack more data per platter, so 
they probably beat the raptors in sequential read tests.  If you are 
using older raptors, ie the 150GB of the 74GB models, I wouldn't expect 
them to do that great in a sequential read test. 

Also for some reason I was noticing lower speeds in raid0 then I did in 
raid10 before I did optimizations, and my raid5 speeds more then doubled 
after optimizations, so the readahead probably plays a big role in these 
test.
I would expect at least similar performance in windows under hd tune, as 
I would think it's doing a sequential test as well?  I will see if I can 
set up IOMeter tommorow and run some tests.
Russ



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