Redundancy: cloud, mirror, SAN, NAS, or spare?

Five different ways of accomplishing the same thing.
REDUNDANCY and reasonable availability for a reasonable price.

Cloud
Hardware: 6x Servers
Software: MS Windows Hyper-V cluster, or Ubuntu Linux Cloud

(Too much hardware.)



Mirror

Hardware: 2x Servers
Software: MS Windows Cluster or Red Hat Linux GlusterFS

 


SAN
Hardware: 2x Servers with redundant SAN (Like Dell PV3220)


NAS
Hardware: 2x Servers with 2x NAS


Spare
Spare: 2x Servers


Thank you: http://serverfault.com/questions/328804/direct-ethernet-link-between-two-servers for the info!

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