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VSAN ESA Requirements

Before enabling vSAN ESA, it is highly recommended that the vSphere administrator validate that the environment meets all the prerequisites and requirements. To enhance resilience, this list alos include recommendations from an infrastructure perspective.


  • Minimum of three ESXI hosts for standard datacenter deployment of vSAN ESA.

  • Minimum of two ESXI hosts and a witness host for the smallest deployment for example remote office/branch office.

  • Minimum memory per ESXI host is 512GB.

  • VMware vCenter Server needs to be equal to or newer than the ESXI version.

  • At least Four NVMe TLC Flash devices for the storage pool, but actually minimum requirement is defined by the ReadyNodes configuration. It may be higher than four.

  • One boot device install ESXI , it should meet the requirements outlined in the VMware KB article 85685

  • Dedicated network port for vSAN VMKernel interface, a dual 25GbE configuration is preferred but a single 25GbE is also supported. Higher density vSAN ESA ReadyNodes will require higher bandwidth NICs up to 100GbE. The NIC does not need to be dedicated to vSAN Traffic, but can be shared with other traffice types such as management traffice, vmotion traffic etc. Network I/O control can be used to ensure fairness.


vSAN configuration takes a couple of clicks but its important to take the time to ensure that all the requirements are met and to ensure that all prerequisites are in place.



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