vsphere ha advanced runtime info failover slots

Configuration options for Admission Control This post will introduce the concepts of slot sizes and configuration of Admission Control to allow more VMs to move between hosts when you have turned on High Availability in vSphere/vCenter.

Tweaking them can save you from buying additional host resources. Another reason? You might be trying to power on new VMs, only to run into errors as you exceed your Admission Control rules. Overcommitting resources can also lead to general performance problems, so it is in your best interest to use Admission Control to keep a close watch on overall capacity. HA keeps your VMs from failing by pooling VMs and hosts in a cluster, relaunching failed VMs on alternate hosts. If you overstretch your resources, some features like High Availability failover may not function as planned. With a 2-node cluster, I would think it a relatively safe bet to set these values to 50%, as your worst case HA scenario would be losing one host out of 2.It’s easy to provision additional VMs and increase resource commitment from your overall resource pool using the vSphere web portal. This will reserve a chunk of resources to be used by HA in the event of a failover, rather than trying to calculate out the size of individual VMs. When HA's Admission Control policy is set to 'Number of Host failures the cluster will tolerate', HA has a very pessimistic view of your resources, as it has to be able to handle all possibilities.Īnother option would be to change the Admission Control policy in the HA Cluster settings to 'Percentage of resources reserved for failover'. In that tile, there will be a link for 'Advanced Runtime Info' which will pop up a new window with the slot information. There will be a tile labelled 'vSphere HA'. To find the slot size and available slots, look at the 'Summary' tab of your cluster. You'll want to look at the 'Reservations' column. There you can look at the resource settings for CPU and Memory. That will show all the cluster's child objects (VMs, Resource Pools, vApps). To check the reservations for VMs, I would select the Cluster in your vCenter inventory, then select the 'Resource Allocation' tab.

Vsphere ha advanced runtime info failover slots