VMware HA is Proactive now!!!
vSphere HA is a technique to guard virtual machine in case of Hardware failing of Host machine. Virtual devices are moved to another Host the moment ESXi host become irresponsive remote or any hardware failure occurred. This is a reactive mechanism of HA which is often used to provide Virtual machine availability using a short interruption of services working on VM.
HA cluster in vSphere 6. 5 is Proactive, using the help web client plug-in simply by OEM vendors (Cisco, Dell plus HP). This Plug-in monitors System, Power, Memory, Local Storage plus Fan of the Server. Failure can be Moderate or even Severe which are defined by suppliers, not by VMware.
Below are the particular proactive responses of HA:
· Quarantine mode for all disappointments
· Pen mode for moderate and Upkeep mode for severe failures
· Maintenance mode for all problems
Take note: Once the root cause is resolved Web host will be taken away from Quarantine Setting but that is not the same case along with Maintenance mode i. e it’ s a manual task within MM.
Vendors plug-in recognizes the particular partial failure and makes a good API call to vCenter, depending on that vCenter will trigger among the configured response.
Hope this was helpful for you: )