RAID 10, 1, 5, 6
RAID one is a popular configuration for end users. It allows for total data redundancy with a minimum of performance degradation. The theory is that if one of the drives in the array degrades the other drive takes over totally and the user is notified with either an alarm from the card and possibly an email.
The problems we at Eboxlab have seen when recovering a mirrored set are as follows.
1. Mirrors get corrupted. Bad data from one drive may propagate itself onto the mirror.
2. Mirror breaks and try to boot from single drive. Operating system still does not boot due to mirror meta data.
3. Upon a rebuild the wrong drive is pointed to.
Note: We have a no data, no charge policy.