I recently wrote a blog posting outlining the steps you need to take to enable VMware ESX/ESXi's ability to hot add RAM and virtual CPUs to a running virtual machine. Although VMware's compatibility documentation indicates that certain operating systems don't support hot plugging new CPUs, it appears to work for some of them anyway.
If you've successfully hot added RAM or CPU to a running virtual machine, respond to this post with your operating system, edition (standard, enterprise, etc), service pack level/kernel version, and architecture (32/64-bit). If enough people respond, I'll compile all of the results into a usable format and republish it.
Posts: 36
Joined: 29.Jun.2010
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Honestly I've only tried this with Server 2008 R2, but I'm sure most know that works. I'd be interested to see a list if you get some responses though.
I'd love to get some real-world information on this one and compile it into a comprehensive blog posting. So, if you know of anyone that's done this, point 'em here! :-)
Personally, I love hot add... makes it easy to be a bit conservative on resources at the front end and adjust as necessary.
A caveat to the ability to hot add RAM and processors. First of all, your operating system has to support the hot add process. Second, you need to be running version 7 of the virtual hardware in vSphere. Version 4 hardware doesn't support hot add.
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