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Table Of Contents
Storage I/O Control Activity
This chart displays the percentage of time during which Storage I/O Control actively controlled latency of
the datastore.
This chart is located in the Performance views of the datastore Performance tabs. The counter can also
be displayed for datastore cluster charts.
Table 134. Data Counters
Chart Label Description
Storage I/O Control
Activity
This is the percentage of time during which the Storage I/O Control actively controlled the I/O latency
for the datastore.
n
Counter: siocActiveTimePercentage
n
Stats Type: Absolute
n
Unit: Percent
n
Rollup Type: Average
n
Collection Level: 3
Average Device Latency per Host
This chart displays the average amount of latency on a host device. The chart displays the 10 hosts with
the highest device latency.
This chart is located in the Performance view of the datastore Performance tab.
Table 135. Data Counters
Chart Label Description
Average Device Latency
per Host
Measures the amount of time, in milliseconds, to complete a SCSI command issued from the physical
device.
n
Counter: deviceLatency
n
Stats Type: Absolute
n
Unit: Milliseconds (ms)
n
Rollup Type: Average
n
Collection Level: 3
Maximum Queue Depth per Host
This chart displays maximum queue depth that hosts are currently maintaining for the datastore. When
Storage I/O is enabled, queue depth can change over time when congestion is detected at the array.
This chart is located in the Performance view of the datastore Performance tab. The chart displays
information about the ten hosts with the highest values.
vSphere Monitoring and Performance
VMware, Inc. 36