On Fri, 30 Apr 2010, Freddie Cash wrote:
Without a periodic scrub that touches every single bit of data in the pool, how can you be sure that 10-year files that haven't been opened in 5 years are still intact?
You don't. But it seems that having two or three extra copies of the data on different disks should instill considerable confidence. With sufficient redundancy, chances are that the computer will explode before it loses data due to media corruption. The calculated time before data loss becomes longer than even the pyramids in Egypt could withstand.
The situation becomes similar to having a house with a heavy front door with three deadbolt locks, and many glass windows. The front door with its three locks is no longer a concern when you are evaluating your home for its security against burglary or home invasion because the glass windows are so fragile and easily broken.
It is necessary to look at all the factors which might result in data loss before deciding what the most effective steps are to minimize the probability of loss.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
