> On Apr 12, 2022, at 10:54 AM, Gogala, Mladen (Short Hills) <mladen.gogala@xxxxxxxxxx> wrote: > > I wouldn’t call turning off data safety “a proper tuning”. It may be faster but can never be deployed to production. As I explained, that which it protects against cannot happen on a ZFS volume. Therefore turning it off is just fine. (ZFS fsync operations are themselves atomic, using its own write-ahead log. So full_page_writes does a double write to avoid corruption, but so does ZFS, thus 4X writes, and a major source of slowness. There is NO danger in letting only one of the two do a double-write in order to avoid a partial write ever being read back.)
