Re: Postgres on RAID5

He doesn't have a RAID controller, it's software RAID...

Alex Turner
netEconomis


On Mon, 14 Mar 2005 16:18:00 -0500, Merlin Moncure
<merlin.moncure@rcsonline.com> wrote:
> Alex Turner wrote:
> > 35 Trans/sec is pretty slow, particularly if they are only one row at
> > a time.  I typicaly get 200-400/sec on our DB server on a bad day.  Up
> > to 1100 on a fresh database.
>
> Well, don't rule out that his raid controller is not caching his writes.
> His WAL sync method may be overriding his raid cache policy and flushing
> his writes to disk, always.  Win32 has the same problem, and before
> Magnus's O_DIRECT patch, there was no way to easily work around it
> without turning fsync off.  I'd suggest playing with different WAL sync
> methods before trying anything else.
>
> Merli
>