Before you activate vSAN, verify that your environment meets all requirements.
Hardware Requirements for vSAN
You must verify that the ESXi hosts in your organization meet the vSAN hardware requirements:
All capacity devices, drivers, and firmware versions in your vSAN configuration must be certified and listed in the vSAN section of the VMware Compatibility Guide.
The memory requirements for vSAN depend on the number of disk groups and devices that the ESXi hypervisor must manage. For more information: VMware KB
Flash Boot Devices:
During installation, the ESXi installer creates a coredump partition on the boot device. The default size of the coredump partition satisfies most installation requirements.
Cluster Requirements for vSAN
A standard vSAN cluster must contain a minimum of three hosts that contribute capacity to the cluster. A Two-host vSAN cluster consists of two data hosts and an external witness host.
A host that resides in a vSAN cluster must not participate in other clusters.
Software Requirements for vSAN
To use the full set of vSAN capabilities, the ESXi hosts that participate in vSAN clusters must be version 7.0 Update 1 or later.
Networking Requirements for vSAN
Each host must have minimum bandwidth dedicated to vSAN. Dedicated 1 Gbps for hybrid configurations and 10 Gbps for all-flash configurations.
Connection between Hosts
Each host in the vSAN cluster must have a VMkernel network adapter for vSAN traffic. also, all hosts in the vSAN cluster must be connected to a vSAN L2 or L3 network. (supports both IPv4 and IPv6)
- 1 ms RTT for standard vSAN clusters between all hosts
- 5 ms RTT between the two main sites for stretched clusters
- 200 ms RTT from the main site to the vSAN witness host