No!
RAID is not a backup service.
- RAID0: only provides speed by striping data across two or more drives. There is no redundancy in this configuration. If one drive becomes degraded, all data can be lost.
- 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. RAID is not a backup solution!
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Article ID: 51, Created On: 1/8/2010, Modified: 5/11/2011