mark(at)mark(dot)mielke(dot)cc writes:
> WAL file is never appended - only re-written?
> If so, then I'm wrong, and ext2 is fine. The requirement is that no
> file system structures change as a result of any writes that
> PostgreSQL does. If no file system structures change, then I take
> everything back as uninformed.
That risk certainly exists in the general data directory, but AFAIK
it's not a problem for pg_xlog.
regards, tom lane