On Fri, Jun 4, 2010 at 9:33 AM, Andres Freund <andres@xxxxxxxxxxx> wrote:
On Friday 04 June 2010 16:25:30 Tom Lane wrote:Jon: To verify you can enable it via the barrier=1 option during mounting..
> Andres Freund <andres@xxxxxxxxxxx> 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.
Andres
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