As you know, the number of Virtual Machines per host depends on available 
resources (CPU, RAM, Disk), as well as the demands of the image.
As a general guide, I have found the following to be reasonable. Other admins, 
please share your opinions.

For a single VM host with 12 virtual CPU and 98 GB RAM, I typically allocate 25 
Windows VM. When necessary, I have raised it to 32 Windows XP machines. For 
linux based images, I have used 50 VM without issues. Monitor the performance 
tab on your vSphere client to see if the host is over-worked.
On Virtual Machines that require higher performance, I usually will not place 
them on a host with more than 10 working VM. But the most important thing is to 
watch the performance closely. You will get a feel for how many VM per host by 
As always, your mileage may vary.

Al Quiros
Florida International University

From: <Sanders>, Arbin D <asand...@nccu.edu<mailto:asand...@nccu.edu>>
Reply-To: "vcl-u...@incubator.apache.org<mailto:vcl-u...@incubator.apache.org>" 
Date: Wednesday, May 23, 2012 3:53 PM
To: "'vcl-dev@incubator.apache.org<mailto:'vcl-dev@incubator.apache.org>'" 
Subject: Max Number of VMs per Host


What is the number of VMs do you all run per VMware host? Is it limited to the 
RAM limitation for vSphere 5? How many purchase vSphere licenses?

Arbin Darren Sanders

IT Manager – Academic Computing
North Carolina Central University
712 Cecil Street
Suite 3014
Durham, NC 27707
919.530.5097 (Fax)

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