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Is a raw lun (RDM) faster than a VMDK on a VMFS? Does physical or virtual RDM mapping make a difference?
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Posted: 18 Jan, 2008
by: Huhtinen H.
Updated: 26 Jul, 2008
by: Huhtinen H.

It depends. Usually the difference is marginal.

VMware has published a performance benchmark
http://www.vmware.com/files/pdf/vmfs_rdm_perf.pdf
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