>>> On Wed, Jan 16, 2008 at 11:40 AM, in message
<[EMAIL PROTECTED]>, Greg Smith
<[EMAIL PROTECTED]> wrote: 
> On Wed, 16 Jan 2008, Alvaro Herrera wrote:
> 
>> Keep in mind that there are claims that a write-cache-enabled
>> battery-backed RAID controller negates the effect of a separate spindle.
> 
> "Negates" is a bit strong; there's still some performance advantage on 
> systems that write a serious amount of data.  It's certainly true that a 
> BCC controller greatly reduces the need for a separate spindle.
 
I haven't seen any benchmarks on the list or in our environment
where the separate spindles gave more than a 1% increase in
performance when using a good-quality BBC controller.  Do you have
results that show more of a difference?  Can you share them?
 
-Kevin
 



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