• Vmware Slot Size Calculation
• Vmware Slot Size Calculation Chart
• Vmware Ha Slot Size Calculation

After you create a cluster, you can configure admission control to specify whether virtual machines can be started if they violate availability constraints. The cluster reserves resources so that failover can occur for all running virtual machines on the specified number of hosts.

1. Slot size is an important concept because it affects admission control. A VMware ESXi cluster needs a way to determine how many resources need to be available in the event of a host failure. This slot calculation gives the cluster a way to reserve the right amount of resources.
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The Admission Control page appears only if you enabled vSphere HA.

Learn what a slot is, how it is calculated, and how it affects your vSphere HA Admission Control.

Procedure

1. In the vSphere Client, browse to the vSphere HA cluster.
2. Click the Configure tab.
3. Select vSphere Availability and click Edit.
4. Click Admission Control to display the configuration options.
5. Select a number for the Host failures cluster tolerates. This is the maximum number of host failures that the cluster can recover from or guarantees failover for.
6. Select an option for Define host failover capacity by. Option

   Description
   Cluster resource percentage	Specify a percentage of the cluster’s CPU and memory resources to reserve as spare capacity to support failovers.
   Slot Policy (powered-on VMs)	Select a slot size policy that covers all powered on VMs or is a fixed size. You can also calculate how many VMs require multiple slots.
   Dedicated failover hosts	Select hosts to use for failover actions. Failovers can still occur on other hosts in the cluster if a default failover host does not have enough resources.
   Disabled	Select this option to disable admission control and allow virtual machine power ons that violate availability constraints.

7. Set the percentage for the Performance degradation VMs tolerate.
   This setting determines what percentage of performance degradation the VMs in the cluster are allowed to tolerate during a failure.
8. Click OK.

Vmware Slot Size Calculation

Vmware Slot Size Calculation Chart

Vmware Ha Slot Size Calculation

Your admission control settings take effect.