I got a little confuse about when to use the HA and Vmotion, are they dependent of each other ? (ie. we cannot setup Vmotion without setting up HA cluster etc)
and is it always ideal to use HA and Vmotion at the same time ? is there any catch in terms of planning them
VMotion and HA are not related and are not dependants of each other. DRS has a dependency on vMotion, but not HA. HA is used in the event that a hosts fails you can have your virtual machines restart on another host in the cluster. vMotion allows you to move a virtual machine from one host to another while it is running without service interruption. Ideally you will utilize vMotion, HA and DRS within your cluster to acheive a well balanced VI environment.
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no, your VM's will go down if there is a host failure and then HA will restart them on another ESX Host in the cluster. This is where DRS will take over and start to balance out the load across the remaining ESX Hosts in the cluster using vmotion.
No, in the event of isolation, you can choose the have you vms to "remain powered on"