Recommendations for Aligning VMFS Partitions

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August 19, 2009

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Partition alignment is a known issue in physical file systems, and its remedy is well-documented. The goal of the testing reported in this paper was to validate the assumption that unaligned partitions also impose a penalty when the partition is a VMware Virtual Machine File System (VMware VMFS) partition.This paper lists a summary of the results of our testing, recommendations for VMware VMFS partition alignment, and the steps needed to create aligned VMware VMFS partitions.