Read IOPs by Host This chart displays the per-host disk read rates for a datastore. This chart is located in the Performance view of the datastore Performance tab. Table 33. Data Counters Chart Label Description Average read requests per second Number of disk read commands completed on each disk on the host, per second. Read rate = blocks read per second × block size ■ Counter: numberReadAveraged ■ Stats Type: Rate ■ Unit: Number ■ Rollup Type: Average ■ Collection Level: 2