I've upgraded my VSphere 4.x to 5.x and am having storage performance problems. What can I do?
A. Use a VAAI-compliant Array
B. Add another LUN
C. Move your VMFS to it's own LUN
D. Use a thick provisioned disk
A, B, C, D
Note that ATS-only flag is not provided on VMFS3 volumes upgraded to VMFS5, causing the use SCSI locks in some cases. ATS-only can be manually enabled.