Re: How filesystems matter with PostgreSQL

What types of journaling on each fs?

On Fri, Jun 4, 2010 at 1:26 PM, Jon Schewe <jpschewe(at)mtu(dot)net> wrote:

> On 6/4/10 9:33 AM, Andres Freund wrote:
> > On Friday 04 June 2010 16:25:30 Tom Lane wrote:
> >
> >> Andres Freund <andres(at)anarazel(dot)de> writes:
> >>
> >>> On Friday 04 June 2010 14:17:35 Jon Schewe wrote:
> >>>
> >>>> XFS (logbufs=8): ~4 hours to finish
> >>>> ext4: ~1 hour 50 minutes to finish
> >>>> ext3: 15 minutes to finish
> >>>> ext3 on LVM: 15 minutes to finish
> >>>>
> >>> My guess is that some of the difference comes from barrier differences.
> >>> ext4 uses barriers by default, ext3 does not.
> >>>
> >> Or, to put it more clearly: the reason ext3 is fast is that it's unsafe.
> >>
> > Jon: To verify you can enable it via the barrier=1 option during
> mounting..
> >
> >
> >
> First some details:
> Linux kernel 2.6.31
> postgres version: 8.4.2
>
> More test results:
> reiserfs: ~1 hour 50 minutes
> ext3 barrier=1: ~15 minutes
> ext4 nobarrier: ~15 minutes
> jfs: ~15 minutes
>
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> Jon Schewe | http://mtu.net/~jpschewe
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