On Thu, Feb 16, 2012 at 19:18, Dan Scales <scales@vmware.com> wrote:
> fsync/fdatasync can be very slow on ext3, because it seems to have to
> always wait for the current filesystem meta-data transaction to complete,
> even if that meta-data operation is completely unrelated to the file
> being fsync'ed.
Use the data=writeback mount option to remove this restriction. This
is actually the suggested setting for PostgreSQL file systems:
http://www.postgresql.org/docs/current/static/wal-intro.html
(Note that this is unsafe for some other applications, so I wouldn't
use it on the root file system)
Regards,
Marti