Re: 3ware 9650 tips

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Fri, 13 Jul 2007, Jon Collette wrote:

> Wouldn't Raid 6 be slower than Raid 5 because of the extra fault tolerance?
>   http://www.enterprisenetworksandservers.com/monthly/art.php?1754 - 20% 
> drop according to this article
>
> His 500GB WD drives are 7200RPM compared to the Raptors 10K.  So his numbers 
> will be slower. 
> Justin what file system do you have running on the Raptors?  I think thats an 
> interesting point made by Joshua.

I use XFS:

Justin what file system do you have running on the Raptors?  I think thats 
an interesting point made by Joshua.

But I also run several 'optimations' for SW RAID and my overall 
configuration--  However, for the mkfs.xfs options, they auto-optimize for 
whatever (SW) raid I have them configured for.  Whereas if XFS cannot tell 
the disks/etc underneath the HW raid, I do not think the optimizations 
will be present(?)-- which menas you'd have to set the sunit and swidth 
appropriately.

>
>
> Justin Piszcz wrote:
>> 
>> 
>> On Fri, 13 Jul 2007, Joshua Baker-LePain wrote:
>> 
>>> My new system has a 3ware 9650SE-24M8 controller hooked to 24 500GB WD 
>>> drives.  The controller is set up as a RAID6 w/ a hot spare.  OS is CentOS 
>>> 5 x86_64.  It's all running on a couple of Xeon 5130s on a Supermicro 
>>> X7DBE motherboard w/ 4GB of RAM.
>>> 
>>> Trying to stick with a supported config as much as possible, I need to run 
>>> ext3.  As per usual, though, initial ext3 numbers are less than 
>>> impressive. Using bonnie++ to get a baseline, I get (after doing 'blockdev 
>>> --setra 65536' on the device):
>>> Write: 136MB/s
>>> Read:  384MB/s
>>> 
>>> Proving it's not the hardware, with XFS the numbers look like:
>>> Write: 333MB/s
>>> Read:  465MB/s
>>> 
>>> How many folks are using these?  Any tuning tips?
>>> 
>>> Thanks.
>>> 
>>> -- 
>>> Joshua Baker-LePain
>>> Department of Biomedical Engineering
>>> Duke University
>>> 
>> 
>> Let's try that again with the right address :)
>> 
>> 
>> You are using HW RAID then?  Those numbers seem pretty awful for that
>> setup, including linux-raid@ even it though it appears you're running HW 
>> raid,
>> this is rather peculiar.
>> 
>> To give you an example I get 464MB/s write and 627MB/s with a 10 disk
>> raptor software raid5.
>> 
>> Justin.
>> 
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