Rick Schumeyer wrote:
1) the input data file 2) the pg table 3) the WAL
And journal of file system, especially if you not set "noatime" mount option. WAL and file system journal like to make sync.
IMHO: on first disk (raid mirror:)) I place /, pg_table and file system journal from second disk. On second /var and pg tables. Thus first disc is synced time to time, second not.
-- Olleg Samoylov
