The more astute of you who have already moved to vSphere 6.0, and like looking at CLI outputs, may have observed some new columns/fields in the PSA claimrules when you run the following command: # esxcli storage core claimrule list --claimrule-class=VAAI The new fields are as follows (slide right to view full output): XCOPY Use Array XCOPY Use XCOPY Max Reported Values  Multiple Segments  Transfer Size --------------- -----------------  -------------- false                   false                  0 false                   false                  0 false                   false                  0 false                   false                  0 false                   false                  0 false                   false                  0 false                   false                  0 false                   false                  0 false                   false                  0 false                  false                  0 false                  …

XCOPY is one of the VAAI primitives that is used for offloading tasks to the storage array. For example, you can use XCOPY to offload such operations as migration or cloning of virtual machines to the array instead of consuming vSphere resources to perform these tasks.