Recommendations of VMware ESXi memory?

I run a G5 DL380 with 16 GB of RAM.  We have four virtual machines of WIndows with 2 GB assign one, 4 GB full-time assigned each to two others and 5.5 GB assigned to the last.  That leaves 512 MB of left to the service console.  I want to know if this is recommended or if there is a better way to do like sharing memory etc.. Thanks in advance.

Hello

Memory allocations (allocation) are the maximum rates of real memory, so that means if the VM needs 4 GB and you allocate 2 that it swap the disk. Granting of 4Gig does not mean this will keep the RAM. If the virtual machine does not use memory, it will be returned to the pool. If you have placed a reservation on the memory, then it will monopolize the memory under contention.

So every VM requires memory overhead to support hardware virtualization. ~ 100-400 Meg Depending processors etc.

The best way to allocate memory is to grant what you think will be the absolute max and leave bookings to unlimited for the rental of the virtual machine, the optimizations memory deal with it.

Some further reading http://www.kingston.com/branded/pdf_files/memory_provisioning_recommendations_vi3.pdf

http://blog.laspina.ca/

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