I'm currently running a Dell R910 with 4 1100w power supplies and Xenserver. I'm looking for a UPS that can keep this beast alive as long as possible with in a budget of course, 15 min would be nice but budgets are tight. And as far as xenserver goes do all the major brands integrate easy enough or do some do a better job than others. I mainly want to be able to program the UPS to keep the server alive as long as possible before it starts to shutdown VM's and then the 910.
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