VMware provides default triggers that you can use to define alarms on virtual machines when they undergo certain conditions and states.

Virtual Machine Condition and State Alarm Triggers lists the Condition and State triggers you can set on virtual machines.

Virtual Machine Condition and State Alarm Triggers

Trigger Type

Trigger Name

Description

Condition

CPU Ready Time (ms)

The amount of time the virtual machine was ready during the collection interval, but could not get scheduled to run on the physical CPU. CPU ready time is dependent on the number of virtual machines on the host and their CPU loads.

Condition

CPU Usage (%)

Amount of virtual CPU (MHz) used by the virtual machine. CPU limits are ignored in the calculation. The calculation is:

VM CPU Usage (%) = VM CPU [MHz] / (# of vCPUs x clock rate of the physical CPU [MHz]) x 100

Condition

Disk Aborts

Number of SCSI commands that were not completed on each physical disk of the virtual machine.

Condition

Disk Resets

Number of SCSI-bus reset commands issued on each physical disk of the virtual machine.

Condition

Disk Usage (KBps)

Sum of the data read and written across all disk instances on the virtual machine.

Condition

Fault Tolerance Secondary VM Latency Status Changed

Amount of wallclock time that the virtual CPU of the secondary virtual machine is behind the virtual CPU of the primary virtual machine.

Low – 0-2 seconds

Moderate – 2-6 seconds

High – More than 6 seconds

State

Heartbeat

Current status of the guest operating system heartbeat:

Gray – VMware Tools are not installed or not running.

Red – No heartbeat. Guest operating system may have stopped responding.

Yellow – Intermittent heartbeat. A Yellow status may be caused by heavy guest OS usage.

Green – Guest operating system is responding normally.

Condition

Memory Usage (%)

Amount of configured RAM (MB) used by the virtual machine. The calculation is:

VM Memory Usage (%) = Active Memory [MB] / configured RAM of VM [MB] x 100

Condition

Network Usage (Kbps)

Sum of data transmitted and received across all virtual NIC instances on the virtual machine.

Condition

Snapshot Size (GB)

Aggregate size (KB) of all snapshots taken for the current virtual machine.

State

State

Current state of the virtual machine:

Powered On – The virtual machine is powered on.

Powered Off – The virtual machine is powered off.

Suspended – The virtual machine is suspended.

Condition

Total Disk Latency (ms)

Average amount of time taken to process a SCSI command issued by the Guest OS to the virtual machine. The calculation is:

Total Disk Latency = kernelLatency + deviceLatency

Low – 0-2 seconds

Moderate – 2-6 seconds

High – More than 6 seconds

Condition

Total Size on Disk (GB)

Aggregate amount of disk space occupied by all virtual machines on the host.