At 02:24 07.05.02 -0500, you wrote:

>The basic assumptions of raid systems seem flawed.
>
>Is a hard drive today, less reliable than it's controller, or the OS and 
>applications?
>
>If the OS or app crashes, and tells the controller to write junk, then you 
>have a stack of nice error correcting junk.

Stop! Don't confuse the terms!

A raid system is definitly NOT a backup, it's something like a fail safe 
system!
It protects ONLY against hardware failture and can't replace a backup system.
With a raid level 5 it is possible to work further if one (and only one of 
at least three) of the hard drives fails.

A well designed backup system with some history and a safe place for the 
tapes protects you from junk data after a crash or an user error. Or a 
fire. Or 1 meter wather in the office, or [insert your favorite desaster].

If you like to feel reasonably save, both of the systems are needed. I like 
to feel save and have both, a raid level 5 and a daily backup of the server 
and a fire proof save for the tapes.

Edi







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