Re: Performance query about large tables, lots of concurrent access

Andrew Sullivan wrote:
> On Thu, Jun 21, 2007 at 12:29:49PM -0400, Karl Wright wrote:
>   
>> I checked the disk picture - this is a RAID disk array with 6 drives, 
>> with a bit more than 1Tbyte total storage.  15,000 RPM.  It would be 
>> hard to get more/faster disk than that.
>>     
>
> What kind of RAID?  It's _easy_ to get faster disk that 6 drives in
> RAID5, even if they're 15,000 RPM.  The rotation speed is the least
> of your problems in many RAID implementations.
>   
Also, the controller means a lot.  I'd rather have a 4 disk RAID-10 with 
an Areca card with BBU Cache than a 16 disk RAID 5 on an adaptec (with 
or without cache... :) )