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 Hyper-V cluster, or Cloud

(Too much hardware.)



Mirror

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

 

  
                         /Datacenter
                                 |
                                 |
                                 |
                        --------------------
                        |                  |
            ------------|      Switch      |-----------
            |           |                  |          |
            |           --------------------          |
            |                                         |
            |                                         |
            |                                         |
            |                                         |
  Network Card 1 (eth0)                     Network Card 1 (eth0)
            |                                         |
  --------------------                      --------------------
  |                  |                      |                  |
  |     Server 1     |                      |     Server 2     |
  |                  |                      |                  |
  --------------------                      --------------------
            |                                         |
  Network Card 2 (eth1)                     Network Card 2 (eth1)
            |                                         |
            |                                         |
            |               Direct 10GbE              |
            -------------------------------------------

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

  
                         Internet/Datacenter
                                 |
                                 |
                                 |
                        --------------------
                        |                  |
            ------------|      Switch      |-----------
            |           |                  |          |
            |           --------------------          |
            |                                         |
            |                                         |
            |                                         |
            |                                         |
  Network Card 1 (eth0)                     Network Card 1 (eth0)
            |                                         |
  --------------------                      --------------------
  |                  |                      |                  |
  |     Server 1     |                      |     Server 2     |
  |                  |                      |                  |
  --------------------                      --------------------
            |                                         |
           SAS                                       SAS
            |                                         |
            |            ------------------           |
            |            |       SAN      |           |
            -------------------------------------------

NAS
Hardware: 2x Servers with 2x NAS

  
                         Internet/Datacenter
                                 |
                                 |
                                 |
                        --------------------
                        |                  |
            ------------|      Switch      |-----------
            |           |                  |          |
            |           --------------------          |
            |                                         |
            |                                         |
            |                                         |
            |                                         |
  Network Card 1 (eth0)                     Network Card 1 (eth0)
            |                                         |
  --------------------                      --------------------
  |                  |                      |                  |
  |     Server 1     |                      |     Server 2     |
  |                  |                      |                  |
  --------------------                      --------------------
            |                                         |
           10GB                                      10GB
            |                                         |
            |            ------------------           |
            |            |       NAS      |           |
            -------------------------------------------
            |                                         |
            |                                         |
            |            ------------------           |
            |            |       NAS      |           |
            -------------------------------------------

Spare
Spare: 2x Servers

  
                         Internet/Datacenter
                                 |
                                 |
                                 |
                        --------------------
                        |                  |
                        |      Switch      |
                        |                  |  
                        --------------------   
                                 |        
                                 |      
                                 |                                         
                        --------------------                      
                        |                  |                      
                        |     Server 1     |                     
                        |                  |                     
                        -------------------- 

                        --------------------                      
                        |                  |                      
                        |   Spare Server   |                     
                        |                  |                     
                        --------------------

Thank you: serverfault.com/question… for the info!

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