@Kim_Bottu … Virtually Gung Ho
CALCULATE THE NUMBER OF HOSTS NEEDED
How many hosts does the client need to host all the VMs? The client wants N + 1 redundancy to be maintained at ALL times.
The client has 1000 VMs. Each VM has:
The client wants to purchase Physical hosts with the following resources:
Total resources needed for 1000 VMs:
Available resources per hosts for VM’s = 80% of available physical resources!
Amount of hosts needed:
Because you need 27 Hosts to fulfill the RAM requirements, this is the amount of hosts which = N.
For N + 1 you need to add 1 host: 28 Hosts. But the exercise states that N + 1 has to be maintained at all times, which mean N +1 has to be maintained even in Maintenance! A host in maintenance does not participate in failover capacity so you have to add 1 more host = 29 HOSTS!
Note: Suppose one of your calculations = a number higher than the maximum number of hosts per Cluster,for example 70. Each cluster would have 35 Hosts as N. Each cluster would need 37 Hosts to comply with the requirements to have N +1 redundancy at all times. Changing a host to a different cluster might not be something you want to do, it takes a lot of time and in some cases is not that easily done.