This article provides information on how EMC VMAX calculates the total IOs.
Formula for calculating total IO's for the entire storage system:
TotalIO = ∑ TotalIOs of Adaptors(FE + BE + SRDF)
Formula for calculating total IO's for the LUN:
TotalIO’s = ReadIOs + WriteIOs + EMCSequentialReadIOs + EMCSequentialWriteIOs
Note: The only caveat about this is that EMCSequentialWriteIOs is only available on a per volume basis. It is not available for the whole array. The CIM class it belongs to is Symm_StorageVolume and not Symm_StorageSystem.
All STM versions