On Tue, Apr 28, 2009 at 11:56:25AM -0600, Scott Marlowe wrote:
> On Tue, Apr 28, 2009 at 11:48 AM, Whit Armstrong
> <armstrong.whit@gmail.com> wrote:
> > Thanks, Scott.
> >
> > Just to clarify you said:
> >
> >> postgres. ?So, my pg_xlog and all OS and logging stuff goes on the
> >> RAID-10 and the main store for the db goes on the RAID-10.
> >
> > Is that meant to be that the pg_xlog and all OS and logging stuff go
> > on the RAID-1 and the real database (the
> > /var/lib/postgresql/8.3/main/base directory) goes on the RAID-10
> > partition?
>
> Yeah, and extra 0 jumped in there. Faulty keyboard I guess. :) OS
> and everything but base is on the RAID-1.
>
> > This is very helpful. ?Thanks for your feedback.
> >
> > Additionally are there any clear choices w/ regard to filesystem
> > types? ?Our choices would be xfs, ext3, or ext4.
>
> Well, there's a lot of people who use xfs and ext3. XFS is generally
> rated higher than ext3 both for performance and reliability. However,
> we run Centos 5 in production, and XFS isn't one of the blessed file
> systems it comes with, so we're running ext3. It's worked quite well
> for us.
>
The other optimizations are using data=writeback when mounting the
ext3 filesystem for PostgreSQL and using the elevator=deadline for
the disk driver. I do not know how you specify that for Ubuntu.
Cheers,
Ken
