Two additional notes:
1 -- I did not mention softraid(4), as it is not quite ready for production, since there is no recovery method for components of a RAID set. The admin must back up, rebuild, and restore, which will usually introduce significant downtime. Though it, like RAIDframe, cannot boot from a RAID set but can easily have root on RAID.
2 -- There are other replication technologies, but those are more commonly used over a network, not from one drive to another. One example is rsync. These remote replication technoligies will introduce data loss, which must be managed, and specific implications for data loss management will be unique to each application environment.
|