Follow these guidelines when you use vSphere High Availability (HA) or Fault Tolerance (FT) to ensure that the system operates correctly.
- Verify that VMware Tools is installed.
- Test that vSphere vMotion, HA, or FT configurations are robust and operate correctly.
- Do not host the virtual SMU on the same HNAS cluster for which the SMU is providing quorum to avoid creating a circular dependency. A quorum loss could prevent access to the SMU's disk image
- Follow guidelines for CPU and memory allocations. Make sure that the SMU VM always has sufficient resources so that the quorum device is not paused or unresponsive for more than five seconds.
- Use 10 Gbps for the FT logging network. Do not use 1 Gbps for the FT logging network as doing so will affect the virtual SMU's performance.
- Use a larger ESXi license when required rather than limit the number of virtual CPUs. FT configurations allow a maximum of two or four virtual CPUs, depending on the ESXi license installed. If you have more than two or four managed entities, verify that operation is sufficient with less than one virtual CPU per managed entity.
- Set up HA or FT configurations with the vSphere Web Client to receive more informative error messages.
For more information about vSphere High Availability, including features, license options, and pricing, visit: www.vmware.com.