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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OpenVZ vs Xen, how much difference in performance?

There is a Xen vs. KVM in performance question on ServerFault. What will be the speed difference if the choice is between Xen and OpenVZ? Searching for such benchmarks does not show any results ...
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The state of XEN vs KVM for inhouse virtual server farm like live farm

so we have a life server Farm, conventional stuff not virtualized. This is to stay that way for the time beeing. The servers we are talking about are: Loadbalancer, DB master, DB Slaves (2x), ...
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Backup Xen domU machines while running

The host machine is running CentOS 5.3 and using LVM to create Logical Volumes (LVs) and to allow live snapshots to be taken of those LVs. My thought was to store all of the image files for the Xen ...
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Xen and Ubuntu?

How does one properly approach having Ubuntu servers on a Xen hypervisor? I don't have any experience with RAID or Xen other than from a theoretical level. Additional requirements: Use with mdadm ...
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What is the best design (software/hardware, backups) for two servers providing virtual machines in colo

I currently have one older server that provides VMs using Xen on CentOS. While not a monster, it supports VT extensions and has a 1TB hardware RAID1 disk set up. I am looking to add another server ...
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Xen alternative for VMware Infrastructure [closed]

Is there any Xen alternative for VMware Infrastructure? Any aggregation and control interfaces?
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DRBD on a disk with existing file system that takes all the place

I'm currently trying to simulate the environment via XEN. I have installed two debian systems with such FS layout: cltest1:/etc# df -h Filesystem Size Used Avail Use% Mounted on /dev/...
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Straight-forward to Virtualise with XEN or KVM on IBM Server System x3650 M4 791562G?

I want to built a virtualised Server Environment using XEN or KVM. The virtual machines should be purely debian systems - so XEN or KVM should be a sane choice. Now while buying servers, I am ...
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Can I virtualize multiple hosts into one virtual system?

I have 5 computer systems in our small office. From my basic understanding of Virtualization technology, I think I can virtualize the 5 systems into one big virtual system. I wish to confirm this. So,...
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Xen 4.1+ with local ZFS storage

I'm speccing out sandbox VM servers for developers at my company. The requirements for the dom0 hosts are: local, deduplicated ZFS storage (no separate storage servers), and Xen 4.1+ (4.2 is ideal). ...
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189 views

Odd log entries and insane bandwidth usage

I have a CentOS cloud server I use for testing and noticed that in the past 30 days, bandwidth out has gone through the roof (16,000 GB to be precise) When I initially attempted to check on the ...
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Xen host and guest sharing same IP

Is it possible for both Xen host and Xen guest to share same IP (albeit with different ports)? We have a single public IP, and want to have both the Xen host (as host only, no other role) and the Xen ...
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What is a good way to develop images or templates that can be used on Xen, KVM and EC2?

I want to make images to do simple network services (e.g. serve a web app, run a memcached, or whatever). It would be really nice to develop an image once, test locally, and then be able to deploy it ...
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437 views

Does ESXi 5 have a “routed IP” feature like Xen?

I have a dedicated server that I would like to use ESXi 5 on. I previously had Xen and it worked great. Initial network configuration was a bit confusing. The problem I have is the hosting company ...
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Virtualisation: Running KVM, XEN or … on an Integrity (ia64) server (with x86_64 guests)

We have a spare Integrity blade (2x Tukwila quad-core + 16Gb RAM) laying around which I would like to use has a Virtual Host for a couple of Linux VMs. I am having some concerns finding the best ...
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Which CPU for XEN - LAMP testbed - Budget [closed]

Dear serverfault knowledgeables, im in a decision dilemma right now, which I can't resolve due to lack of hands on experience. I need to build a testbed for basically virtualizing a LAMP application (...
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USB forwarding from dom0 to domU

What are my options to forward two USB connected phones to xen guest? I've read about PCI-passthrough http://www.wlug.org.nz/XenPciPassthrough, but I'm sure usb controller in the server isn't a pci ...
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Xen live motion

I am researching XenServer from Citrix and (with 2 colleagues) comparing it with VMware ESX and Microsoft HyperV. In our tests, it seems that Xen's live migration is using less resources than VMware'...
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How can I run Rackspace images locally?

As the title says, I regularly download my Rackspace images for backup of my VPS, however I'm wondering if it's possible to run them locally on KVM (for example) so I can run tests on my application ...
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Xen DomU on DRBD device: barrier errors

I'm testing setting up a Xen DomU with a DRBD storage for easy failover. Most of the time, immediatly after booting the DomU, I get an IO error: [ 3.153370] EXT3-fs (xvda2): using internal journal ...
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How do I tell real CPU load in a xen environment?

I have a Debian machine with 4 CPU cores running Xen with two virtual machines, and I'm having trouble determining overall real CPU usage. Each machine has two VCPUs assigned to it with no cap on CPU ...
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My VPS crashed and I have no idea why

I have a VPS with Linode right now. I was alerted by my monitoring service that a site I was hosting had gone down. I used Lish, Linode's method of getting direct out-of-band access to the console ...
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EC2 issue using PV-Grub and custom kernel: error 21 selected disk does not exist

Over on EC2 I am trying to setup AMI's for PLD-Linux that use the new features that allow running custom kernels from inside the AMI using PV-Grub. I've setup custom AMI's many times before but can't ...
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How can I generate filesystem images that are usable on many different virtualization systems?

I have written a script that generates a root filesystem image (based on Debian lenny) suitable for User-Mode Linux. (Essentially this script creates a filesystem image, mounts it with a loop device, ...
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How can I know when a Xen VM has started when starting using CLI

I'm using XenServer as a host for disposable QA machines for our application development. I'd like to write a script that automatically creates a new VM from a template, starts it, logs into it, ...
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Running SQL 2008 on a VM

We are pondering trying to set up a SQL 2008 instance inside a VM for a production environment. All our SQL instances use iSCSI over gigabit ethernet to talk to a NAS, as would this new instance. ...
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Using more recent kernel for Xen Dom0 in production

Does anyone have experience running Xen dom0 on a more recent kernel than the stock 2.6.18? What host distro are you running? What release of Xen (or hg/git changeset)? What set of patches are you ...
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Can I automate XEN? And to what extent

I am wondering about a certain scenario. User on some machine runs a command. This unpacks XEN and boots up domain 0. Domain 0 boots up 3 other domains that are setup in this way. One is a "client" ...
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598 views

Automatically Port Xen Images to EC2

I have a disk image that is running under Xen right now and I'd like to port it to Amazon's EC2. How can I do this in a way that is as simple as possible? I've got a script that can build the finished ...
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Can fragmented MySQL innodb tables cause I/O issues? “task hung for 120 seconds” crashes?

Large innodb databases with load spikes seem to be causing random crashes with "task hung for 120 seconds" in the console. There are no logs being written to the system during these crashes. The ...
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Hardening Virtual Machine

I have a CentOS based product I'm looking to distribute it as a virtual machine (VMWare, XEN and KVM) and I have been lately assessing the steps needed to protect the VM. The VM's data shouldn't be ...
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Xen Bridge Over VirtualBox Bridge

Short version: Will a Xen bridge work over a VirtualBox bridge? If so, how does it work? Long version: I have Debian 6 (Squeeze) 64bit installed as a guest in VirtualBox, which is setup as a bridge ...
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359 views

Can i install Xen Hypervisor on a dedicated server that is already in use

I have a dedicated server, currently i sell shared hosting on this server... Now i want to sell VPS also on my server. Is there a way i can sell VPS? Can i use Xen Hypervisor,will it disturb my shared ...
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Intel NIC: VMDc or VMDq?

I need to buy a nic that I want to eventually (~3 months) re-use for a VM server deployment that will need to support heavy network I/O. Server is a Xeon Gulftown/Westmere-EP. Intel has server NICs ...
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cp and cat on Centos 5.5/ext3 is 10x slower for files in certain directories

I was sorting some large files (91GB across 27 files) with GNU sort when I noticed that iostat -dxk 3 showed very slow read speeds, between 5 MB/s and 10 MB/s, with 100% disk utilization. I tried cat ...
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Please clarify on the relation between Xen, VirtualBox, Sun VM and Oracle VM

Please clarify on the relation between xen, VirtualBox, Sun vm and Oracle vm Which products still exist after Oracle acquired Sun? which of the products that still exists are derived from xen?
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333 views

Good Xen image repository? [closed]

Does anyone know of a good image repo for Xen, sort of like Appliance store for VmWare? Also something like sourceforge but for xen, with tools and such? I know there used to be jailbreak.org - which ...
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Stale NFS handle

I have several xen guest OSs that get their root file system from NFS. I changed /etc/network/interfaces on some of them (on the nfs server) and then rebooted them. Now I get lots of 'Stale NFS ...
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Xen memory management on small server

I am currently running VMware vSphere 5 on a server I use for various projects. Mainly I use it for honing my skills with administration and running a few game servers. Recently I was considering a ...
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Can any one clarify this on xen cloud platform/xen server

As per XCP documentation, Xen Cloud Platform host is a 64 bit x86 server-class machine devoted to hosting multiple VMs. on blog.citrix.com they are mentioning about dom0 as It should be noted that ...
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compile kernel 2.6.34 for Ubuntu Lucid for xen dom0 / pvops

I'd like to compile a recent Linux kernel (2.6.34) for my Ubuntu 10.04 Lucid Lynx AMD64 box, mainly because I'd like to use it as a dom0 kernel with the recent xen4. There's plenty documentation on ...
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271 views

Remus on Amazon EC2: If and When?

Slashdot recently brought word that the Remus project (which implements hot-backup Xen instances) has been merged into the core Xen. Since Amazon have leveraged Xen in building out EC2, I naturally ...
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Finding Memory Leak on Linux

I'm going crazy trying to find a memory leak on one of our main boxes. It runs CentOS, kernel 2.6.18, x86-64. The box (actually VM on Xen) has been running great with no problems since it was created ...
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1answer
215 views

Running a Xen Dapper dom0 with a Hardy domU

Is it possible to set up a Hardy domU on an existing Xen dom0 running Dapper? I have found many postings talking about the reverse (Dapper domU on a Hardy dom0), but I have the existing server set up ...
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Whole block device named xvda1, xvda2 instead of xvda, xvdb

I am working on a VM that was set up for me in a public cloud. It's running under the Xen hypervisor in paravirtualized mode and has two virtual disks. So I expect the virtual disk block devices to be ...
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846 views

Using ZFS or XFS on a Xen guest running Linux

Background: I'm investigating the viability of using a filesystem other than ext3/4, with the ability to run snapshots for backup and rollback purposes. The servers under consideration are mailbox ...
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AppArmor - root: “You do not have enough privilege to read the profile set.”

I'm trying to use AppArmor on a remote hosted Xen server with a custom built kernel. AppArmor appears to be running, but not correctly. For example if I run the following command as root: # aa-...
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XenServer Converting HVM to Paravirtualised

Recently I have been tasked with the daunting process of converting a setup of HVM enabled VMs (running on Citrix XenServer 5.6.0) into PV (paravirtualised) containers. The constraints of the project ...
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PID ran away with all our MEM and SWAPPED hard - OSSEC RHEL

Forgive me for the length of this question... it is mostly details... only attempt to follow if you also enjoy reading log files... or drinking coffee. I'll state the questions first: 1) how the ...
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Red Hat Kickstart: How do I Prevent partitioning?

Hey all, I'm currently working on a new virtualisation setup using Xen, and Centos for my workplace. We intend to deploy the domUs into LVM volumes. Currently, the only thing preventing this from ...