RAID 1 on web servers?

We have 5 load balanced web servers that are moderately stressed during peak. If one of them goes down, the other four should be able to handle the load until the HD is replaced on the bad one. So is it worth it to have RAID 1 on these servers? Seems to me an unnecessary expense/setup. Isn't the data already redundant since its being load balanced?

The web servers are doubling as application servers also. The db is on its separate box with RAID 5.

What do you guys think, should I implement RAID 1 on the web servers or skip it?

 

 

 

 

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