Based on the information you provided, it sounds like a network-attached storage (NAS) product is your best bet....
Look at NAS systems with multiprotocol support such as block or file systems with iSCSI or Fibre Channel (FC)/FCoE, or NFS and CIFS, and perhaps even AFP for Macs. Choose a NAS system that uses redundant paths and connections that also have dual controllers (nodes, processors, NAS heads) for high-availability (HA).
Still not sure what to do? Send me an email or tweet me @storageio and we can further explore your scenario and options.
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