already installed the trial of VSA on vcenter server, for below, i do need to create a new datastore, for example if the esxi A has 6 vm guest is running, i need to migrate the 6 vm guest to this new datastore ? the delete the datastore where i use to have the vm guest sitting ? and add this datastore below VSA volume ? do i have to do the same on the another esxi B ?
Yes exactly, but when you will extend your VSA Datastore a reboot is required. And you need to do the same thing with your ESXi B.
by adding the two esxi A & esxi B to the cluster in vcenter, do this before or after the above step ?
You can do this step before, but do not enable DRS and HA. Enable this two options after only when you have created and finished to extend your VSA Datastore.
Regards,
Julien