VM Performance Summary Version 10.0.01

When a VM exhibits performance issues, it could stem from either the server, the actual storage, or other network factors. Once server bottlenecks are addressed, the next step is to determine if there’s an issue with the LUN and disks. While vCenter provides performance statistics, this information is not always readily available to Storage Administrators.

The VM Performance Summary enables a Storage Administrator to have an at-a-glance look at I/O performance statistics: CPU, Memory, and Disk I/O. In addition, Disk I/O is broken out into reads and writes, with latency statistics. In addition, this report provides the necessary CPU Ready States and CPU Wait States to determine if an ESX host can handle another VM Guest.

• Disk Read and Write Latency is available only for ESX Hosts (not VMs). Therefore, latency performance charts are available only for partitions of Type=Host.

• In the vCenter VM ESX Server settings, the statistics level must be set to Level 4 in order for balloon statistics to appear in the VM Performance Summary report. When Level 4 is configured, it will also capture the other statistics, as listed in the following table, Performance Counters and Statistics Level Settings. See vCenter Statistics Configuration.

• In the vCenter VM ESX Server settings, the statistics level must be set to the maximum level based on the counter listed in the following table, Performance Counters and Statistics Level Settings. Note that level 1 is always captured, but other levels may need to be set for other performance counters. Configuring a level lower than the required level for a counter will result in a failure to retrieve the relevant data from VSphere and will cause inaccurate values in reports. See vCenter Statistics Configuration.

Table 1 Performance Counters and Statistics Level Settings
Performance Counters Collected	Statistics Level
Memory (%)	2
Memory Usage (%)	1
Avg CPU Usage (%)	1
Avg CPU Usage (KB)	1
Disk Avg Usage (KB/sec)	1
Disk Reads (KB/sec)	2
Disk Writes (KB/sec)	2
Disk # of Reads	3
Disk # of Writes	3
Disk Total Latency (ms)	2
Disk Read Latency (ms)	2
Disk Write Latency (ms)	2
Disk Queue Latency (ms)	2
Disk Queue Read Latency (ms)	2
Disk Queue Write Latency (ms)	2
Maximum Queue Depth	1