Xen is a hypervisor based virtualization. It supports x86, AMD64, IA64, ARM and other CPU types, and Linux, Windows, Solaris and *BSD guest operating systems.

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74
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4answers
13k views

Why is TCP accept() performance so bad under Xen?

The rate at which my server can accept() new incoming TCP connections is really bad under Xen. The same test on bare metal hardware shows 3-5x speed ups. How come this is so bad under Xen? Can you ...
31
votes
7answers
59k views

Xen vs KVM in performance

What is faster on same hardware - Xen or KVM? I'm trying to pick-up a virtualization technology to work, which gives the best performance. There are some benchmarks here that I found on the subject: ...
27
votes
2answers
38k views

Difference between Xen PV, Xen KVM and HVM?

I know that Xen is usually better than OpenVZ as the provider cannot oversell in Xen. However, what is the difference between Xen PV, Xen KVM and HVM (I was going through this provider's specs? Which ...
17
votes
4answers
1k views

What are the benefits of “enterprise-level” virtualization?

For a company with modest virtualization needs - VirtualBox is currently doing fine at hosting a few light servers - what would some of the benefits be of moving to a more robust platform? I'm ...
15
votes
9answers
19k views

LVM snapshots as a backup strategy

How viable as a backup strategy would be periodical LVM snapshots of xen domU's? Pros, cons, any gotchas? To me it seems like the perfect solution for a fast, brainless restore. Any investigation ...
12
votes
6answers
3k views

Is virtualbox good for live server virtualization

I used virtual box before to test OS installation on my own personal computer. I'm not sure if it's suitable for actual virtualization on live servers. I mostly hear about Xen for that. Is virtualbox ...
11
votes
7answers
6k views

Tough Choice: Xen or KVM

I'm building a fresh workstation and want to use Linux alongside Windows. This seems like a good opportunity to get acquainted with with either Xen or KVM. So I face a choice. In favour of using ...
11
votes
3answers
2k views

How to disable “safely remove hardware”

I have some windows 7 virtual machines in xen that have devices showing up in "safely remove hardware". I don't want users to ever be able to remove/eject any hardware at all. I'm told vmware has a ...
10
votes
3answers
2k views

Optimizing Apache and MySQL on Linux Xen VPS

I have a Xen virtual private server (VPS) running Ubuntu 8.10, with 128M RAM. I've found several "how to optimize Apache and MySQL for low-memory VPS" pages via Google, but they provide contradictory ...
8
votes
8answers
2k views

Which virtualization platforms should I choose, Xen or OpenVZ?

I am upgrading my shared hosting to VPS hosting, mainly to just add server administration skills to my development skills, so I'm facing a lot of new choices just signing up. I need to choose a ...
8
votes
3answers
5k views

Xen image file vs partition/LVM volume performance

I read quite a lot of advice to switch from file-image VM storage, to partition/LVM volume based. The claim is that partition/LVM are much faster then image files. The downside in my opinion, is ...
8
votes
1answer
4k views

VDI Comparison - VMWare View vs. XenDesktop vs. Sun VDI

We're looking at implementing a VDI solution where I work. Currently, we run a mostly Linux shop with Windows clients (Samba PDC too). We've been evaluating a VDI solution for use and was wondering ...
8
votes
2answers
20k views

Having Mac OS X on a XEN virtual machine

Is it possible to have Mac OS X guest on a XEN host? If yes, how? There are difference for Mac OS X Server? In particular I'm interested in the installation of a testing Mac OS X Server inside a ...
7
votes
3answers
14k views

Xen vs. VirtualBox under heavy load?

Which performs better under heavy CPU and memory usage on the virtual servers, Xen or VirtualBox?
7
votes
14answers
3k views

Which Linux-Virtualization to choose for Server?

Hy, I got a brand new Intel i7 Server-System with 12GB Ram and I want to consolidate three other linux-servers onto this machine using virtualization. I want to use the harddisks (via a kind of LVM) ...
7
votes
4answers
7k views

Xen DomU root filesystems becoming read-only on iSCSI virtual IP failover

My Xen servers are openSUSE 11.1 with open-iscsi to our iSCSI SAN cluster. The SAN modules are in an IP failover group behind a virtual IP that the initiators connect to. In the event that the ...
7
votes
1answer
3k views

Xen 4.1 host (dom0) with blktap disks (“tap:aio:”) not connecting

Problem using blktap with xen-4.1 running Ubuntu Precise stock kernel with dom0 xen-4.1. I get: [ 5.580106] XENBUS: Waiting for devices to initialise: 295s...290s. ... [ 300.580288] XENBUS: ...
7
votes
2answers
2k views

Xen vs KVM: Which will have likely better support (read:bugfixes) in the future?

I don't care about GUI or tools, but I do care about stability and performance. If I'm running a FreeBSD firewall and a Opensolaris file server as guests, will I get better stability or performance ...
7
votes
3answers
1k views

After LVM/DRBD resize df is reporting incorrect information

I have a Debian Xen DomU which has a DRBD mounted partition. I needed to resize this partition from 46G to 50G. I did the following: Stopped DRBD on the secondary node: /etc/init.d/drbd stop ...
7
votes
1answer
1k views

How to monitor / control file IO in Xen virtual machines

I have a pretty beefy Xen server (8 CPUs, 4G of RAM) running about 40 256M VPSs and I've been having issues with file IO speed. What I've found is one or two VPSs on the host can severely degrade ...
6
votes
5answers
6k views

How to fine-tune our MySQL server?

MySQL is not my thing, yet I need to fine-tune one of our servers. Here are the requirements/specs: The MySQL server has only one significant database We only have one "type" of application ...
6
votes
3answers
2k views

Backing up Xen domains

I'm currently developing a Xen backup system, however I have met the following problem: I have two methods of backing up: doing dd from the LVM snapshot, and tarring it., and rsync it remotely ...
6
votes
2answers
4k views

use LXC under heavier virtualization (Xen, KVM,Hyper-V,VMVare)

Is it possible to use LXC under heavier virtualization (Xen DomU,KVM,Hyper-V,VMVare) ? I would like to use it as security (isolation) tool, the ability to limit resource consumption is not priority ...
6
votes
1answer
981 views

Windows 8 virtualization gives BSOD 0x0000005D

I find that, when trying to run windows 8 on Xen cloud (and also when running it in ESXi), the installer bluescreens with 0x0000005D (UNSUPPORTED PROCESSOR) Initially I thought it was giving the VM ...
6
votes
4answers
940 views

Alternatives to Xen for virtualization setup

I currently use Xen in production to run a number of Ubuntu VMs (Intrepid/Jaunty). I've got another server which I'd like to set up as a VM host to run more guest OSes, and am looking for the best ...
6
votes
2answers
4k views

Intel Atom 330 as a server machine [closed]

That's the processor I'm thinking about getting for a home server / development machine. Going for $80 as intel motherboard + dual core processor combo is a really tempting deal. What I'm planning to ...
6
votes
3answers
2k views

Xen connect to dom0 with vnc?

Is there are a way to connect to dom0 using VNC without running X? I don't want an X server, I just want to see what is on the console. EDIT: Adding some background, since people seem to be really ...
6
votes
2answers
1k views

keepalived issues on xen domU

I cannot manage to run keepalived correctly on xen domU. I am following this link for configuration, and it works great on some local VM (running with KVM). If I set up the exact same configuration, ...
5
votes
6answers
3k views

What is the perfect setup for a small Linux virtual server?

I have my own email server, and it serves a couple of dozen users. I need to replace it right now, and I want the replacement to be a virtual server image running under a hypervisor. My plans for ...
5
votes
4answers
278 views

Virtualization for hardware resiliency?

Can anyone tell me if it is possible to pool several physical servers to run a resilient virtualization environment. Our servers are getting more and more critical to our clients and we want to do ...
5
votes
3answers
4k views

Xen vs virtualbox?

Is there much performance difference between Xen and virtual box?
5
votes
7answers
3k views

Secondary IP (eth0:0) acts like main server IP

I have a CentOS server, configured with 4 consecutive IPs: eth0 5.x.x.251 eth0:0 5.x.x.252 eth0:1 5.x.x.253 eth0:2 5.x.x.254 The problem is that all traffic goes out to the internet with eth0:0 ...
5
votes
1answer
5k views

How to convert Xen image to VirtualBox?

I have some open-source Xen images (.img), that I want to convert to VirtualBox. Both the methods I tried (convertfromraw or to .xva via xva.py then to ova via XenConvert) produce FATAL: Fatal: No ...
5
votes
3answers
2k views

server virtualization: hypervisor (xen) or virtualbox?

Hey guys! I just set up a debian server for websites but now I need to install a windows server on the same machine because I need to run a game server (windows-only). Virtualbox is already installed ...
5
votes
3answers
1k views

Xen alternative for VMware Infrastructure

Is there any Xen alternative for VMware Infrastructure? Any aggregation and control interfaces?
5
votes
2answers
1k views

RHEL Clones (Centos, Scientific, CERN) network installation on XenServer 6.2

I'm trying to install a Scientific Linux CERN 6 guest on XenServer 6.2 through the network with PXE Booting but it hangs in the message: mounting /tmp as tmpfs... done I'm not using the most ...
5
votes
2answers
6k views

Debian/OVH: How to configure multiple Failover IP on the same Xen (Debian) Virtual Machine?

I have a problem on a Xen virtual machine (running latest Debian), when I try to configure a second failover IP address. OVH reports that my IP is misconfigured and they complaint they receive a ...
5
votes
2answers
1k views

Performance and Utilization monitoring of Xen Dom0

We run a mixed bag of Citrix XenServer and Gentoo/Xen virtualization platforms in our company. In general, we use XenServer where we have shared storage (SAN, iSCSI or whatever) and Gentoo/Xen where ...
5
votes
2answers
2k views

KVM to Xen migration

I've recently been appointed to create some VMs for production use, and went gung ho into making a KVM based VM instead of finding out what our production server uses. I've only recently found out ...
5
votes
3answers
1k views

setting up Ubuntu 10.10 as paravirtualized guest in Xen on RHEL5 host - what kernel?

I've discovered the tool ubuntu-vm-builder, which I've installed and then invoked on an Ubuntu workstation as: sudo vmbuilder xen ubuntu --suite maverick --flavour virtual --arch amd64 --mem=512 ...
4
votes
5answers
3k views

vmware server end of life, where to go now?

We have some virtual machines on vmware server 2.x running on 64 bit hardware and quite happy with it. As vmware server will no longer be offered we are thinking to migrate to ESXi, which seems is ...
4
votes
5answers
3k views

How to find dom0 name from hosted domU

I'm actually testing RHEL 5.3 with Xen between two servers in order to have a disaster recovery solution. So I'm playing with moving my domU from one dom0 server to the other server. Unfortunatly ...
4
votes
6answers
916 views

What do you recommend? OpenVZ or Xen DomU?

I’m looking for a new server at the moment and a fitting virtualization solution. On my recent server I’m using VMware server but don’t what this one anymore as it is very very slow. I have the ...
4
votes
2answers
1k views

Xen - Make one guest OS have 2 cpus?

I have inherited a Xen setup. The dom0 and domU's are all linux. dom0 has 8 cores (or CPUs, I'm not sure). We want to run more stuff on one domU. I want to make it a multicore CPU, ie so that the domU ...
4
votes
5answers
2k views

Xen only sees 512MB of System RAM. Should be 8GB. (UEFI boot)

I am booting Xen 4.0 from Debian Squeeze, kernel 2.6.32-5-xen-amd64. "xm dmesg" on dom0 shows: Xen-e801 RAM map: 0000000000000000 - 0000000000091400 (usable) 0000000000100000 - 0000000020000000 ...
4
votes
1answer
4k views

Can I safely uninstall “Citrix Tools for Virtual Machines”?

Having several virtual servers with Windows 2008 R2 at our web hoster (Germany's "1&1", they seem to use Citrix Xen), I have every now and then some servers that hang (RDP login screen hangs ...
4
votes
3answers
2k views

Is KVM stable enough for production use in 2011?

We are planning to virtualize the existing infrastructure by an open source virtualization solution. KVM and Xen are on the final list. Big cloud players are still using Xen, and we found that KVM is ...
4
votes
1answer
301 views

How do I make all Xen guests use their host clock value?

I've set up Xen server under Linux with several guests running, and all was well. After some time I've noticed the clock on the server drifted away, so I installed 'ntpd', and the clock was back to ...
4
votes
1answer
842 views

Difference between Processors and CPU core

can any one please clarify the difference between actual no of processors and CPU cores. in my case i am having Intel Xeon® Processor E5620 as per intels product page: its having # of Cores 4 # of ...
4
votes
1answer
106 views

How does a VM hosted on xen knows that it is in a virtualized environment [closed]

I have read that in para virtualization hosted virtual machines are aware that they are being virtualized, and this allows them to increase their performance. But, how does the hosted machine know ...