vCenter only provides the following screen for Storage at the datastore cluster level. Just like with datastores, the screen is a fixed set of charts, the details of which cannot be modified.
The complete list of charts provided by vCenter is mentioned as follows:
Normalized Latency per datastore (Top 10)
Aggregate IOPS per datastore (Top 10)
SIOC Activity report per datastore (Top 10)
Storage I/O Control Normalized Latency
Storage I/O Control Normalized Aggregate IOPS
Average Device Latency per host (Top 10 only)
Maximum Queue Depth per host (Top 10 only)
Read IOPS per host (Top 10 only)
Write IOPS per host (Top 10 only)
Average Read Latency per VM vDisk (Top 10 only)
Average Write Latency per VM vDisk (Top 10 only)
Read IOPS per VM vDisk (Top 10 only)
Write IOPS per VM vDisk (Top 10 only)
As you can see from this list, it's rather limited. Just like with datastores, there are no counters for throughput and most charts only show...