Re: Huge iowait during checkpoint finish

Greg Smith wrote:

> If the old system had a write caching card, and the new one doesn't
> that's certainly your most likely suspect for the source of the
> slowdown.

Note that it's even possible that the old system had a card with write
caching enabled, but *no* battery backed cache. That's crazily
dangerous, but does get you the speed benefits of write caching without
the need for a BBU. I only mention this to help explain a possible
performance difference - you should NEVER do this if you care about your
data.

--
Craig Ringer