In most cases, there are no performance benefits to using an RDM versus a traditional non-RDM virtual disk in a VM. There are 2 exceptions:
1) For sequential reads and writes, RDM provides slightly better I/O performance at smaller I/O block sizes.
2) As I/O block size increases, CPU cycles per I/O increases for VMFS compared to RDM.
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1) For sequential reads and writes, RDM provides slightly better I/O performance at smaller I/O block sizes.
2) As I/O block size increases, CPU cycles per I/O increases for VMFS compared to RDM.
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