Also consider if the service is protected (redundant) or if you have to buy extra redundancy separately as well as determine what the divergent network paths are. Finally have your network or prospective network provider give you a measured report of the latency between locations along with db loss. You can learn more about long distance and extended distance storage connectivity in the SearchStorage tip "Bridging The Gap", as well as chapter 6 "Metro and Wide Area Storage Networking" in my book "Resilient Storage Networks" (Elsevier).
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