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Re: partition question for new server setup

From: Kenneth Marshall <ktm(at)rice(dot)edu>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: Whit Armstrong <armstrong(dot)whit(at)gmail(dot)com>,pgsql-performance(at)postgresql(dot)org
Subject: Re: partition question for new server setup
Date: 2009-04-28 18:06:21
Message-ID: 20090428180621.GI26100@it.is.rice.edu (view raw or flat)
Thread:
Lists: pgsql-performance
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(dot)whit(at)gmail(dot)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

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