Virtualization - XEN

Posted on 2013-12-15
Medium Priority
Last Modified: 2013-12-25
What is XEN?

What is KVM?

is RHEL comes with XEN? i was reading some posts in google and its say KVM over XEN?

what is really the relation between kvm and xen?

please explain.
Question by:ittechlab
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LVL 35

Assisted Solution

by:Dan Craciun
Dan Craciun earned 1125 total points
ID: 39720343
Read here for a comparison: http://www.linux.com/news/enterprise/systems-management/327628-kvm-or-xen-choosing-a-virtualization-platform

Basically, XEN is a bare-metal hypervisor, while KVM is included in the Linux kernel.

LVL 35

Accepted Solution

Dan Craciun earned 1125 total points
ID: 39720419
Xen is a type 1 hypervisor, KVM type 2.

If you're going with RedHat you might as well stick with KVM. It is my understanding that's the favorite for the major Linux distributions, which should mean better support.
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Author Comment

ID: 39726838
Redhat has own hypervisor too right. type 1. what is that?  is that based on xen?
please explain.
LVL 35

Assisted Solution

by:Dan Craciun
Dan Craciun earned 1125 total points
ID: 39726973
Extract from here: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/5/html-single/Hypervisor_Deployment_Guide/#chap-Deployment_Guide-Introducing_Red_Hat_Enterprise_Virtualization_Hypervisors

The Red Hat Enterprise Virtualization (RHEV) Hypervisor is a compact, full-featured virtualization platform for quickly and easily deploying and managing virtual machines.
The RHEV Hypervisor is based on the Kernel-based Virtual Machine (KVM). KVM is an advanced and efficient virtualization hypervisor implemented as a Linux kernel module. As KVM is a kernel module, it leverages the existing Red Hat Enterprise Linux kernel and benefits from the default kernel's extensive testing, device support and flexibility.
The RHEV Hypervisor is constructed using a subset of packages from Red Hat Enterprise Linux along with several special RHEV packages. RHEV is certified for all hardware certified for Red Hat Enterprise Linux.

What this means? The hypervisor runs under Linux, so it's a type 2 hypervisor.

Author Comment

ID: 39729860
[root@Client-4 ~]# virsh list
 Id Name                 State

I have two vm which i created in kvm. i can't see when i ssh and run this command.

if i run virt-manager its shows two vms. please advise.
LVL 35

Expert Comment

by:Dan Craciun
ID: 39730250
You're going to have to post this as a separate question.
I use Hyper-V day to day, and I only studied other virtualization options to see if I find something better suited to my needs.

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