vSphere HA uses admission control to ensure that sufficient resources are reserved for virtual machine recovery when a host fails.
- VMware HA Slot is the default admission control option prior to vSphere 6.5. Slot Size is defined as the memory and CPU resources that satisfy the reservation requirements for any powered-on virtual machines in the HA cluster.This article is just to cover how.
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- This post is the follow up post for my previous post on VMware HA Slot Calculation. In that post, i have explained the step by step procedure for how to calculate the HA slot information. This post clarifies more on the Total Slots, Used Slots & Available slots in VMware HA Slot calculation. I strongly recommend to read.
- Feb 01, 2017 To start you out, here's a quote from VMware KB article #1010594: VMware HA determines the number of slots that are available in each ESX/ESXi host based on the host’s CPU and memory capacity. It then determines the number of ESX/ESXi hosts that can fail in the cluster with at least as many slots as powered on virtual machines.
- Dec 04, 2007 We get an enormous amount of questions about VMware’s HA (High Availability), especially when users see a message stating there are Insufficient resources to satisfy HA failover. We have already discussed the mechanism that HA uses to provide high availability here. Now we need to understand capacity calculations.
If vSphere HA admission control does not function properly, there is no assurance that all virtual machines in the cluster can be restarted after a host failure. You might get a not enough failover resources fault when trying to power on a virtual machine in a vSphere HA cluster. Fewer Available Slots Shown Than Expected.
Admission control imposes constraints on resource usage. Any action that might violate these constraints is not permitted. Actions that might be disallowed include the following examples:
Powering on a virtual machine
Migrating a virtual machine
Increasing the CPU or memory reservation of a virtual machine
The basis for vSphere HA admission control is how many host failures your cluster is allowed to tolerate and still guarantee failover. The host failover capacity can be set in three ways:
Cluster resource percentage
Slot policy
Dedicated failover hosts
vSphere HA admission control can be disabled. However, without it you have no assurance that the expected number of virtual machines can be restarted after a failure. Do not permanently disable admission control.
Regardless of the admission control option chosen, a VM resource reduction threshold also exists. You use this setting to specify the percentage of resource degradation to tolerate, but it is not available unless vSphere DRS is enabled.
The resource reduction calculation is checked for both CPU and memory. It considers a virtual machine's reserved memory and memory overload to decide whether to permit it to power on, migrate, or have reservation changes. The actual memory consumed by the virtual machine is not considered in the calculation because the memory reservation does not always correlate with the actual memory usage of the virtual machine. If the actual usage is more than reserved memory, insufficient failover capacity is available, resulting in performance degradation on failover.
Setting a performance reduction threshold enables you to specify the occurrence of a configuration issue. For example:
The default value is 100%, which produces no warnings.
If you reduce the threshold to 0%, a warning is generated when cluster usage exceeds the available capacity.
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do you use VM resource reservation ? the HA cluster fail over will check the reservation not the actual load on the cluster
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ie your cuurent load is 42Gb RAM 3Ghz processor power but if your reservation is 120Gb and 40Ghz CPU the cluster will complaint that the 1 host HA has not enough resources.
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You can avoid this error by changing your HA cluster to percentage of cluster resources instead of host failure but you are better to scope this properly and check if you have enough free resources if you use reservation.
Vmware Ha Configuration
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