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• RAID1 provides redundancy in that two or more drives can be mirrors of each other. This is slower than RAID0, but if, for example, you have two drives in a RAID1, you can lose one drive and still maintain the data. Simply hot swap a new drive for the degraded drive and the RAID 1 rebuilds. BUT, if two drives become degraded, the data is lost.

• RAID5 allows for striping across two disks and a third disk mirror. This allows for speed and redundancy. The problem is that if the mirror drive becomes degraded along with one of the striped disks, then the data is lost.
• RAID10 allows for striping across two disks and two mirrored disks. This allows for two mirrored disks and one striped disk to become degraded before data is lost.

The moral of the story is that if you want to ensure your data is safe, perform regularly scheduled backups outside of the server. EIRCA provides a few backups solutions:

1. Evault backup is an enterprise backup solution that can automate backups across multiple servers. Data is stored to an enterprise SAN (storage area network).
2. Network Attached Storage is an industry standard, and provides off-server storage for critical data. Data is stored to an enterprise SAN (storage area network).