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HA Master election is actually done by doing a few simple checks, the first one is the greatest number of datastore a hosts has mounted. If multiple hosts have the same number of datastores, the next criteria - the highest Managed Object Id - comes into play. See "Election" at https://ha.yellow-bricks.com/fundamental_concepts.html
This is what i need to know what does it mean
" the first one is the greatest number of datastore a hosts has mounted". Greatest Number mean in Bigger Size or number of Datastore mounted to specific host? In my case I have 5 Esxi host mounted to 3 Shared ISCSI Storage. So how the Master selection will happen?
Greatest as in Number of DataStores, but as Andre stated it is just the foremost decision point in a number of decision points.
read the article stated in his reply to gain a greater understanding.