Host data

Host performance data is based on volumes performance data. It aggregates attached volumes.
There is not kept performance statistics separately per host base. All is only mapping to assigned volumes
Storage usually do not to provide host based performance statistics.

Therefore data provided here do not have to be always accurate in this scenarios:

There is more hosts which share same volumes (typical for cluster usage)
In this case you can see high traffic even on the stand-by cluster nodes
When a volume is re-assigned in time, then its historical traffic is presented under the new host instead of the original one where it has been generated.

There are exceptions when some storage are able to provide real per host based performance data.
In this case you can see real data for every attached host.
List of storage providing direct host based perf statistics:

Hitachi VSP
Dell EMC² VMAX, PowerMAX
Dell EMC² XtremIO
Dell SC series (Compellent)
HPE Alletra 9000, Primera, MP, 3PAR
Huawei OceanStor, Dorado
Pure Storage FlashArray
Lenovo (Infinidat) InfiniBox
DataCore SANsymphony