[TriLUG] New system configuration thoughts

[Brian Henning]

Kevin Flanagan supposed:

> How is RAID mirroring not redundancy?  It's redundancy where you don't
have 
> a system outage in order to replace a disk that has failed.  Odds are
in 
> your favor that you won't have 2 failures at the same time.  Mirror
first, 
> _then_ you replicate the data to another system.

Ever heard the suggestion about always replacing your headlights in
pairs?  The odds of having two failures (of equally-aged,
equally-stressed hardware, as in a RAID mirroring setup) at the same
time are fairly high.

~B