Thread: ext3 with data=ordered

Is it reasonable to mount the PGDATA filesystem with data=writeback on ext3 as
long as the PGXLOG filesystem is mounted data=ordered and fsync=on?  Or is
this only acceptable if you have battery backed controllers?

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Jeff Frost, Owner     <jeff@frostconsultingllc.com>
Frost Consulting, LLC     http://www.frostconsultingllc.com/
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Jeff Frost wrote:
> Is it reasonable to mount the PGDATA filesystem with data=writeback on ext3 as
> long as the PGXLOG filesystem is mounted data=ordered and fsync=on?  Or is
> this only acceptable if you have battery backed controllers?

data=writeback is fine on all PostgreSQL file systems, including pg_xlog
because we fsync() it on commit.  In fact it is the recommended mount
option for ext3.

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