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The VMware Virtual Machine File System (VMFS) is a powerful automated file system that simplifies storage management for virtual machines. VMFS also serves as a cluster volume manager to ease the management of shared storage resources within a cluster of VMware ESX hosts. As a volume manager, VMFS serves as the interface for virtualization of several storage options that a storage area network provides. These options include supporting snapshots that might be made by the storage subsystems, changing disk serial numbers, and presenting a given disk to two separate servers as different LUN numbers. VMFS can handle these different cases with a few settings that enable VMFS volumes to be assigned new volume signatures.
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