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.
It can be handy to keep it seperate anyway because it makes it trivial to
track WAL I/O vs. database I/O.
--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD