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Windows Server® 2008 Hyper-V™ Resource Kit by Janique Carbone Robert Larson and Microsoft Windows Virtualization Team

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Using a Pass-Through Disk

Hyper-V allows virtual machines to access a physical disk mapped directly to the Hyper-V server, but without a volume configured on it. This is referred to as a pass-through disk. Pass-through disks can be physically connected to the Hyper-V server or through a logical unit number LUN on a Storage Area Network (SAN). One of the advantages of pass-through disks is that they are not subject to the 2040-gigabyte size limitation that is imposed on virtual hard disks. In contrast, pass-through disks do not support dynamically expanding virtual hard disks, differencing disks, or virtual machine snapshots. In order to ensure that a virtual machine has exclusive access to the physical disk, it must be configured as offline on ...

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