Virtual Disk parameters

Hi,

When I see the Virtual disk parameters from ESXi, it shows me parameters DAVG, KVAG and GVAG... I understand these parameters.

However, the parameters under the Vcenter performance tab, under the advanced chart options, the Virtual Disk are confusing. Can anyone please clarify if they are one of the same parameters (davg, kavg,  gavg) or are they from OS level.

Thanks in Advance.

Regards,

Srini