Performance history for virtual machines
This sub-topic of Performance history for Storage Spaces Direct describes in detail the performance history collected for virtual machines (VM). Performance history is available for every running, clustered VM.
Note
It may take several minutes for collection to begin for newly created or renamed VMs.
Series names and units
These series are collected for every eligible VM:
| Series | Unit |
|---|---|
vm.cpu.usage |
percent |
vm.memory.assigned |
bytes |
vm.memory.available |
bytes |
vm.memory.maximum |
bytes |
vm.memory.minimum |
bytes |
vm.memory.pressure |
- |
vm.memory.startup |
bytes |
vm.memory.total |
bytes |
vmnetworkadapter.bandwidth.inbound |
bits per second |
vmnetworkadapter.bandwidth.outbound |
bits per second |
vmnetworkadapter.bandwidth.total |
bits per second |
In addition, all virtual hard disk (VHD) series, such as vhd.iops.total, are aggregated for every VHD attached to the VM.
How to interpret
| Series | Description |
|---|---|
vm.cpu.usage |
Percentage the virtual machine is using of its host server's processor(s). |
vm.memory.assigned |
The quantity of memory assigned to the virtual machine. |
vm.memory.available |
The quantity of memory that remains available, of the amount assigned. |
vm.memory.maximum |
If using dynamic memory, this is the maximum quantity of memory that may be assigned to the virtual machine. |
vm.memory.minimum |
If using dynamic memory, this is the minimum quantity of memory that may be assigned to the virtual machine. |
vm.memory.pressure |
The ratio of memory demanded by the virtual machine over memory allocated to the virtual machine. |
vm.memory.startup |
The quantity of memory required for the virtual machine to start. |
vm.memory.total |
Total memory. |
vmnetworkadapter.bandwidth.inbound |
Rate of data received by the virtual machine across all its virtual network adapters. |
vmnetworkadapter.bandwidth.outbound |
Rate of data sent by the virtual machine across all its virtual network adapters. |
vmnetworkadapter.bandwidth.total |
Total rate of data received or sent by the virtual machine across all its virtual network adapters. |
Note
Counters are measured over the entire interval, not sampled. For example, if the VM is idle for 9 seconds but spikes to use 50% of host CPU in the 10th second, its vm.cpu.usage will be recorded as 5% on average during this 10-second interval. This ensures its performance history captures all activity and is robust to noise.
Usage in PowerShell
Use the Get-VM cmdlet:
Get-VM <Name> | Get-ClusterPerf
Note
The Get-VM cmdlet only returns virtual machines on the local (or specified) server, not across the cluster.