Insufficient resources to satisfy HA

After building or converting a new VM, you may find the following error when you power it on:

This is due to Admission Control in VMware calculating your current host utilization and determining you wouldn’t have enough resources available to run your VMs in case of a host failure, based on the settings specified.  Ideally, you should add the adjust host/vm resources to ensure that your Admission Control can be met.  If not, Admission Control can be adjusted if required by right-clicking on your Cluster and selecting “Edit Settings:


Next, select vSphere HA and either a) Disable Admission Control or b) Adjust your Admission Control Policy:

About AJ McKean

Based in sunny Tauranga, New Zealand, AJ McKean is a Senior Systems Engineer in Mt Maunganui. With over 15 years of professional IT experience working in both New Zealand and the United States, he holds several certifications including MCSE(2000-2003), MCITP:Enterprise(2008), MCSA(2012), VMware VCP-DCV5.5, CompTIA A+ & is an HP Storage Architect. He is passionate about all things IT, especially virtualization, automation & cloud technologies.

2 Responses to “Insufficient resources to satisfy HA”

  1. ben @ geekswing says :

    Hi. Disabling admission control in the short term is fine to power up VMs in an emergency. The best thing to do is fix it long-term: figure out why the resource allocation is so high. This is different from resource usage itself, this is the pre-allocated resource when a VM is turned on regardless if the VM actually uses it.

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