Wondering how all the I/O requests by virtual machines are handled in Hyper-V? Hyper-V has a storage IO balancer which prevents one busy VM from starving another VM. The Performance Tuning Guidelines for Windows Server 2008 at http://www.microsoft.com
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Read the complete post at http://blogs.technet.com/tonyso/archive/2008/12/04/hyper-v-how-to-balance-vm-i-o.aspx