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Share Storage for XenServer FreeNAS, StarWind or OpenFiler

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http://serverfault.com – I am looking to set up a share storage for our servers in data center. Environments: 4 x Citrix XenServers (Free version) will be running around 30 VMs. Some VMs are heavy websites that have 5GB per day traffic. We consider getting a Supermicro Server(dual power) and install FreeNAS/StarWind SAN/OpenFiler on it. (We can't afford high end SAN, like equilogic). The redundancy is the most important thing(fast snapshots backup, failover if possible), and then the performance. Not sure how much better SAN is than NAS in our case. Have been struggling not sure which way to go with. Any advic (HowTos)