Vmware hot add memory windows 2008

Windows Server Standard Edition x Windows Server Web Server x Do you know different? If you are aware of other OS's that can make use of these features, please leave a comment below. Follow Simon Long on Twitter. Check out his profile on LinkedIn. Based on that list, nobody will be using the hot add CPU feature then!!

I liked Scott Lowe's approach in his vsphere book. If it needs to be amended on the fly, well you just increase the limit, sort of like hot adding memory.

However, it is good to know about another scalability limitation. VMware has set a maximum value for hot add memory. By default, this value is 16 times the amount of memory assigned to the virtual machine.

For example, if the virtual machine memory is 2 GB, the maximum value for hot add memory is 32GB 2x Actually, this is a good safety mechanism and here is the reason for such restriction When hot memory is enabled, the guest operating system uses a huge amount of kernel memory space in the PFN database.

I added the host to vCenter. Afterward, I checked whether the change has run smoothly with Task Manager for Windows or using top and lscpu commands Linux. Note that you need to restart Task Manager to see the changes. In Windows Server R2, you can do that right from the window that pops up once you confirm configuration changes. Note that the NUMA nodes option is grayed out. To be honest, I did not check how adding RAM on the fly affects applications that I was running at that moment.

I used the native utilities here apart from sysctl in FreeBSD. I just wanted to show how hypervisor behaves if you attempt changing VM configuration on the fly in an environment that does not support that feature. Looks as if there were some changes applied! If you know any, please share it in comments. Here, I use lscpu to trace vCPU number change and top for identifying memory changes. Even being said to be capable of supporting Hot-Add, Ubuntu and Debian behave strange.

Changing the number of vCPUs also works weird: the system allows hot-plugging, but the newly-added processors are off-line. Well, this phenomenon has something to do with how Ubuntu and Debian work. Do you have any ideas on how to explain that thing? ESXi Web interface says that everything is great. The system silently allows changing the configuration… but it does not display the right number of sockets until you reboot the VM.

Check out top output.