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Re: Best use of second controller with faster disks?

From: Vivek Khera <vivek(at)khera(dot)org>
To: Pgsql performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Best use of second controller with faster disks?
Date: 2007-06-13 14:02:40
Message-ID: 97E42E3F-2F4C-4518-B378-870A4168664B@khera.org (view raw or flat)
Thread:
Lists: pgsql-performance
On Jun 12, 2007, at 8:33 PM, Francisco Reyes wrote:

> Vivek Khera writes:
>
>> what raid card have you got?
>
> 2 3ware cards.
> I believe both are 9550SX
>> i'm playing with an external enclosure  which has an areca sata  
>> raid in it and connects to the host via fibre  channel.
>
> What is the OS? FreeBSD?

FreeBSD, indeed.  The vendor, Partners Data Systems, did a wonderful  
job ensuring that everything integrated well to the point of talking  
with various FreeBSD developers, LSI engineers, etc., and sent me a  
fully tested system end-to-end with a Sun X4100 M2, LSI 4Gb Fibre  
card, and their RAID array, with FreeBSD installed already.

I can't recommend them enough -- if you need a high-end RAID system  
for FreeBSD (or other OS, I suppose) do check them out.

>> Right now I'm testing an 8-disk RAID6 configuration on the same    
>> device; it seems slower than the 16-disk RAID6, but I haven't yet   
>> tried 8-disk RAID10 with dedicated log yet.
>
> Is all this within the same controller?

Yes,  the system is in testing right now, so I'm playing with all  
sort of different disk configurations and it seems that the 16-disk  
RAID6 is the winner so far.  The next best was the 14-disk RAID6 + 2  
disk RAID1 for log.

I have separate disks built-in to the system for boot.


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