Saturday, April 16, 2011

What RAID isn't...

I periodically have to discuss what RAID is and what it isn't.  I have this discussion with management, IA, and even experienced system administrators.  Last years Information Storage and Management class allowed me to order my thoughts and come up with a more concise statement:  

Although RAID can support a back-up solution (as a separate storage solution), it's main reasons for existence is high availability or high bandwidth.  It is not (in itself) a backup solution as it does not take snapshots in time.  

If you're using RAID as your primary and you've configured it to mirror itself (on the same system), you're only one horrible accident away from losing everything.  The mirror will only save you from hardware failures.

Thoughts?  Arguments?