Number of virtual machines per server
This number varies greatly with the type of workload and of (among other variables) network connectivity, but what would you say is a common number of virtual machines running on a particular server (NIC10 G ) platform? 10? 20? 40? The number of sockets/cores on this server?
Any contribution is appreciated.
Thank you
Hey Ex,.
This issue of $ 1 million has been requested several times before. The answer is simple - there is no definitive answer. There are so many variables that contribute to the number of virtual machines, you can run on a server:
-number of Sockets
-Core per socket
-CPU speed
-Density memory
-Bandwidth allocated by host
-Storage connectivity & bandwidth
-Attributes VM & function of workload (amount of memory, CPU & disk by virtual machine)
Although you can probably squeeze a lot more virtual machines per server with densities increased memory & CPU power, also increases your default domain name. HA may be able to 'recover' virtual machines on a failed host, but how virtual machines are you willing to lose only once? When sizing of your hosts, also the failover capabilities take into account. Each of your cluster hosts should be able to tolerate the failure of at LEAST one host and meet all the requirements of memory & processor of the additional virtual machines now spread over the remaining hosts in the cluster. This is why administrators does not often grow over 60% of the capacity of their hosts. VMware uses a calculation of size "slot" to ensure you have adequate to your cluster failover capacity.
As typical, I see regularly around the mark of 20 VM per server on a typical 2-socket server with 96 GB of memory and dual 10 G uplinks. It is also good to think that most software licenses (VMware, Nexus 1000v etc.) is based on the counts of socket, and since the memory is going to be your first argument point - servers that can support large amounts of memory are usually an ideal choice. B250 is perfectly placed to virtual workloads like this, while the B230 is a little firecracker with a bit more CPU power under its hood so you need.
As vague as I was, I hope this starts your thought process
Kind regards
Robert
Tags: Cisco DataCenter
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