Hardware RAID Level & Performance

[Lee]

We're rebuilding our mail cluster using two servers clustered together 
with DRBD/heartbeat. We've run DRBD/heartbeat before, so Im fairly 
comfortable with teh performance implications of that.

What i'm wondering is, how the hardware raid level on the two poweredge 
2650s (aacraid perc3/di controller) using linux 2.6 kernel and EXT3 
will effect the performance of cyrus. In the past we've always used 
raid 10, believing that it offered a significant performance boost over 
raid 5 for write intensive apps like cyrus. Recently however i noticed 
that CMU is actually using RAID 5 on its arrays. Obviously being able 
to use RAID 5 would be terrific as it would give us significantly more 
storage for the buck.

What are the implication of raid 10 vs. raid 5 with cyrus? Are they 
significant? Does EXT3 play into the discussion?

Thanks,
Lee

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