Performance Characterization of VMFS and RDM Using a SAN

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November 19, 2008

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VMware ESX Server offers two choices for managing disk access in a virtual machine VMware Virtual Machine File System (VMFS) and raw device mapping (RDM). It is very important to understand the I/O characteristics of these disk access management systems in order to choose the right access type for a particular application. Choosing the right disk access management method can be a key factor in achieving high system performance for enterprise class applications.