Originally posted by jlakhani
Marist,
so if RAID 0+1 has no redundency then why does Oracle recommend it?
Whoa. RAID 0+1 does have redundancy. The redundancy is sacrificed when a disk goes bad which renders the stripe bad. Most arrays that have 0+1 capability have the capability to detect a bad drive, fail it, and substitute a hot spare. While the hot-spare is resyncing, you don't have any redundancy. Once the stripe is back to normal, you have your redundancy again. When a disk goes bad, you have mabye two hours where the stripe is vunerable.

In a 1+0 system, up to 1/2 of your disks can go bad before you lose all your redundancy.