On Sun, 29 Mar 2009, Frank Middleton wrote:
So what is best if you get a 4th drive for a 3 drive raidz? Is it better to keep it separate and use it for backups of the replaceable data (perhaps on a different machine), as a hot spare, second parity, or something else? Seems so un-green to have it spinning uselessly :-) LTO-4 tape drives at $200 just for the media? I guess not...
With so few drives it does not make sense to use raidz2, and particularly since raidz2 still does not protect against user error, OS bugs, severe over-voltage from a common power supply, or meteorite strike.
An external backup drive system that you can turn off (e.g. a USB or eSATA drive) and detatch is the appropriately green solution. For this pupose I use two large USB drives with ZFS in a mirrored configuration.
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
