> From: Ragnar Sundblad [mailto:ra...@csc.kth.se] > > Rather: ... >=19 would be ... if you don't mind loosing data written > the ~30 seconds before the crash, you don't have to mirror your log > device.
If you have a system crash, *and* a failed log device at the same time, this is an important consideration. But if you have either a system crash, or a failed log device, that don't happen at the same time, then your sync writes are safe, right up to the nanosecond. Using unmirrored nonvolatile log device on zpool >= 19. > I'd say, that "In zpool version 19 or greater, it is recommended not to > mirror log devices." is not a very good advice and should be changed. See above. Still disagree? If desired, I could clarify the statement, by basically pasting what's written above. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
