I have noticed that with our RedHat x64 VMs created with 1GB of memory (hot-add enabled) - only support a hot-add of 2GB of memory. It was my understanding that the default hot-add value should be 16x the powered on memory value. I did confirm that this was the case with newly created Windows 2008 x64 VMs. I created a new Windows VM (hot-add enabled) powered it on with 1 GB of memory and was able to hot-add up to 16GB.
Configuring a linux VM and powering on with 1GB only allows hot-add too a max of 3GB. I can of course add more if I power the VM off. In fact this is the case with any linux VM powered on with less than 3 GB of memory, hot-add then only supports an increase to 3GB.
If I configure a new linux VM with say 4GB of memory I am able to hot-add up to 64GB (validating the x16 hot-add factor).
Anyone else encounter this, or have any VMware docs to this effect?
Jason
