Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I know that Microsoft suggests that you leave 1GB of memory for the parent partition on a Hyper-V server. Does VMware have a similar suggestion?

share|improve this question
up vote 5 down vote accepted

Memory overhead is going to hinge on a lot of things. Luckily, VMWare has a nice little table to let you know what to expect:

Also see this

share|improve this answer
That's for the older ESX stuff. Most people are using ESXi with vSphere 4, which has a smaller footprint, but the way some of the additional services work has changes in some isntances as well. This is a good baseline, but not the absolute for vSphere 4. – MDMarra Jun 9 '10 at 2:26
Thanks Mark. I've edited my post to update for vSphere4 Docs – Jason Berg Jun 9 '10 at 2:32

In practice, based on the few that I run in production, the ESXi core uses around 200 or so mb. Personally, I try to keep around a gig free of non-reserved ram per server (200 reserved for ESXi, 256 mb for Linux guests, 512 to 1024 mb for Windows guests depending on version and services)...

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.