Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Could someone explain how it is different? Is there a performance difference? Any reason for me to choose one instead of the other?
As the other answer you have already explains, there are some architectural differences between the two projects. Roughly speaking, where an Intel VT hypervisor is concerned, to activate the hypervisor you run in assembly a special sequence of instructions, culminating in VMXON.
This enables the hypervisor mode. Part of that work involves defining virtual machines in terms of their extended page tables or the AMD equivalent. This is like the ordinary task of setting up page tables what memory maps where except you do it for whole memory regions for virtual machines.
Previous VM technology just trapped VM Exits for this purpose which are essentially like fancy hardware interrupts. Build a standalone hypervisor that sets up the virtual machine monitor and then waits for guest operating systems.
Usually, it either contains enough of its own operating system to manage the VMs, or supports a privileged guest. For example, the Xen Hypervisor includes a "Dom0" "guest" that has the ability to manage the hypervisor. Build a hypervisor as part of an existing kernel, for example as a kernel module. Code can be installed as a virtual machine monitor in Intel VT at any point during an operating system's lifetime assuming sufficient privilege and also removed.
As such, the hypervisor code simply sets up the necessary required space in-memory as needed. Practically, the difference for the end user would be that you cannot unload the hypervisor if it is of the first kind without a reboot. This is because it acts like an operating system in its own right. Hyper-V acts like this - if you have Hyper-V installed you cannot then install VirtualBox, for example, because both cannot share the virtual machine monitor space since Hyper-V already has it.
In order to unload the hypervisor, you need to reboot. Is there any workaround for this to use the waste ram's. The key difference is that Windows Server is a hypervisor based virtualization product. This means that the guest operating systems and the parent operating systems interact with the hardware through a thin layer which provides hardware assisted virtualization. The guest operating systems and parent operating system are now on essentially the "same playing field".
This has a very significant affect on performance of virtual machines, security due to VM isolation , IO, and management. Windows Server Hyper-V will run on systems with 64 bit, hardware assisted virtualization ex. The requirement for 64 bit sounds like a downside, but I've found it to be a blessing. I've found that memory usually the biggest bottleneck for running more virtual machines on a single parent system. The usage of a 64 bit operating system allows for very high memory scalability, meaning that many more virtual machines can be put on a single parent system.
Most of the servers and workstations for that matter that I've implemented in the last year support 64 bit. The Hyper-V product also supports 64 bit child operating systems. In contrast, Virtual Server is not a hypervisor based virtualization engine. Virtual Server essentially run "on top of" the parent operating system, which results in inferior performance and inefficient IO.
Virtual Server also does not support 64 bit child operating systems. This feature provides high availability for virtual machines by allowing multiple parent systems to host the systems.
When a snapshot is created, a new differencing virtual disk is created as a new VDI file. When you delete a snapshot that represents an earlier VM state as compared to your current VM state, then a differencing virtual disk is merged with a parent virtual disk, or multiple differencing virtual disks are merged. Be aware that snapshots are used primarily for testing purposes, but not for production purposes.
Note: Checkpoints and snapshots are useful for testing and help you to revert VMs to their previous state. Read our blog post to learn more about the difference between snapshots and backups. You can interact with the guest OS of the VM by using a keyboard and mouse similarly to interacting with physical machines.
A connection to the VM can be established from the local machine on which Hyper-V is installed and the VM is running, or from a remote machine via the network. VMConnect is usually enabled by default when the Hyper-V role is installed. Enhanced session mode allows redirecting local devices and resources to a VM. Clipboard, disk drive, USB flash drive, audio, printer, and display configuration can be redirected.
VirtualBox also contains tools for the convenient management of virtual machines. VirtualBox Remote Desktop Extension VRDE is the general extension interface that provides maximum flexibility with extension packages that can be developed by third parties. To connect to a remote guest VM, you should type the IP address of the host machine and port set for a remote connection to the VM in the VM display settings.
Live Migration is a Hyper-V feature that allows you to move running VMs from one Hyper-V host to another transparently, and without significant downtime.
This feature is especially useful when you use Failover Cluster because it helps you provide high availability for the VMs. It is recommended to use a dedicated migration network for Hyper-V Failover Cluster. VM files such as virtual disks must be located on shared storage. If you need to move VM files from one storage to another, then Storage Migration should be used.
Source and destination VMs must use the same shared storage. The VM can be transferred from a source host to a target host with minimal downtime, independent from the host OS. For example, you can transfer running Windows-based VMs from a Linux host to a Solaris host or vice versa. Teleporting is available from VirtualBox version 3. Migration of running VMs improves the flexibility of your virtual environment.
Hyper-V supports hardware virtualization. Hardware virtualization is a technology that uses a hypervisor to create an abstraction layer between software and physical hardware for emulating computers. All devices needed for the proper functionality of a computer are emulated with special software. VirtualBox supports hardware and software virtualization. Software virtualization can only be used for VMs with bit guest operating systems that use x86 architecture.
For bit guest systems, only hardware virtualization may be used. You can create, import, configure, start, stop, and remove VMs with Hyper-V Manager, as well as perform other actions such as configuring virtual switches, virtual hard disks, creating checkpoints, connecting to the guest OS interface with VMConnect, etc. Hyper-V servers can be managed with PowerShell, which is a Windows command line interface developed by Microsoft. PowerShell Remoting must be enabled for this purpose.
Another advantage is the ability of scripting and automating. Port Mirroring is a network traffic analyzing tool for Hyper-V. This feature allows you to send copies of all received and transmitted packets from one port to another for further packet analysis.
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