The virtual machine (VM) placement problem in data center is to deal with how to place N VMs onto M physical machines (PMs), aiming to minimize the total cost or to maximize the utility of PMs, etc. Genarally, a PM can host multiple VMs concurrently.
Several recent works have be focused on this topic, and they set a constraint that a single VM must run on one PM. This means that a single VM can not run across PMs. Thus, we can not assign a VM to multiple PMs.
However, there is no industry standard to indicate this contraint.
Here, I want to know if a single VM runs across several PMs.
Dear Long,
Theoretically, yes, a single VM can span multiple PMs. However, to the best of my knowledge, current hypervisors do not support creating a single VM that spans multiple PMs as hypervisors are intended to split capacity of an only PM and not to merge the capacity of multiple PMs. But, there are other options that can enable you to aggregates multiple PMs into one single virtual high-end system such as vSMP ServerONE (https://www.scalemp.com/products/vsmp-serverone/).
Good Luck
Dear Long,
the problem of VM placement is an optimization problem. The goal is to place a set of VMs on a minimum number of PMs in order to minimize the total cost or to maximize the utility of PMs, while respecting certain constraints.
To the best of my knowledge, if you want to run a single VM across several PMs, this will increase the energy consumption and thus the total cost.
Good luck
VMs to mitigate the high cost of physical machines and provide us with cheaper (albeit slightly less performance efficient) solutions in different enterprise businesses. PMs in order to minimize the total cost or to maximize the utility.
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