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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3answers
855 views

clustered file system choice for KVM/XEN in Fibre Channel Environment

Gents, what would you recommend for production use in a FC environment, where live migration is a must? Which clustered file system should we use? OCFS2? Would you still need drbd? Thanks!
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2answers
85 views

What is IP address on a subnet

I'm reading the requirements for a virtualized environment from here which says: IP Address - One IP address on a subnet for the host. - One IP address on a subnet for each VM Guest. I want ...
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1answer
58 views

what virtualization design they have here [closed]

I'm trying to understand what virtualization schema they have here. Initially I thought it's just Xen on a physical server, but if you click FAQ & Features, it takes you to this page that says ...
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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 ...
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1answer
611 views

CentOS 5.5 needs xenblk.ko, what's the easy way?

I'm taking a class on cloud computing and we're using CentOS 5.5 with xen. When I tried to run mkinitrd to build a vm, I got a message that xenblk was not found, and indeed I can't find the xenblk.ko ...
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1answer
218 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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0answers
404 views

CentOS 5.5, XEN, black screen when loading OS

This is a very weird bug. I have installed CentOS 5.5 on many computers. On one of them I have done the reinstallation several times, sinces I wanted to fix a clean install I have installed OpenNebula ...
0
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1answer
2k views

How to unhide a VM in Xen?

After failed OVF import, I have some VMs which are appearing in XenCenter only if I enable Hidden Objects option in View menu. How can I unhide a hidden Virtual Machine in Xen Server?
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1answer
327 views

Networking setup under Xen 4.1

Looks like Xen 4.1 went through some major changes as far as networking goes. With that said, I have two NICs on the host. eth0 and eth1. I want dom0 to be accessible via eth0 and only eth0. I want ...
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3answers
851 views

XenServer on i7 Processors?

Was wondering if anyone is using an i7 XenServer. Didn't see anything in the HCL on the XenServer site. If you are using it how is the performance and should I build one on i7 or a older Xeon ...
2
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1answer
874 views

Ubuntu upstart hangs on interactive start & stop

How do I get Ubuntu upstart to not hang on interactive start & stop? I have created many upstart scripts that work fine during init, but often hang when I enter them at the console. If I CTRL+C ...
3
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3answers
850 views

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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2answers
475 views

XEN VM config locations on Debian Squeeze

I have inherited a debian squeeze VM host, which is not booting anymore. I want to export the virtual machines to another host, including config files and disk containers before killing the machine. ...
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 ...
1
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1answer
445 views

Setting up Xen on Ubuntu 10.04 LTS (64bit) from a precompiled kernel

I'm looking for a way to install Xen(Dom0) on Ubuntu 10.04 LTS 64bit without having to compile my own kernel. I used to do this for 8.04 using this precompiled kernel: ...
2
votes
1answer
444 views

Debian - corrupted GRUB

I have installed Xen on Debian following the official manual from debian.org. After that I runned grub-update and some time later removed Xen, including xen kernel. I runned grub-update one more time, ...
2
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2answers
3k views

Problem with Xen, xvda and sda

I am creating a cloud for my university using Eucalyptus with Xen (PCs have Debian Squeeze 64 bit installed). I have a problem with the following guest configuration: # # Configuration file for the ...
73
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4answers
12k 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 ...
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2answers
272 views

Collectd retrieving only NaN on Xen dom0

For some reason Collectd works fine on all my virtual servers, but on the dom0 of my Xen setup it keeps returning a value of NaN, I have checked the RRD files and it seems somehow all plugins are ...
0
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2answers
185 views

Debian/Nginx/PHP5-FPM on Xen. Is it the right choice?

I have a complex web application running on a Debian/Nginx/PHP5-FPM stack. The application usually has ~600 online users everytime, and ~5000 unique users per-day. The stack is running on a Xen-based ...
0
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1answer
227 views

Why would Xend try to restore a deleted domain/VM?

I have a domain 'host10' that no longer exists on the system. The config file was renamed, the configuration changed to point to a different .img, and the image name was renamed as well. I've done ...
0
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2answers
902 views

What causes the error “Error: Device 0 (vif) could not be connected. Hotplug scripts not working.” on CentOS5.6 x86_64 with Xen kernel?

I have 10 domU's on my CentOS 5.6 server running Xen kernel. All 10 are set to start on system boot; however, for just 1 of the machines, I get this error: Error: Device 0 (vif) could not be ...
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2answers
709 views

Upgrading a Xen host from debian lenny to squeeze

I am in the process of upgrading the Xen host from Lenny to Squeeze. What is the recommended route for this upgrade? Upgrade the host first then the guests? Will the guests be able to boot if I do ...
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1answer
1k views

Xen to KVM windows guest migration

I'm trying to work out how to migrate a Xen based windows server guest to a KVM host. I've grabbed a copy of the Xen image and run an image conversion on it. kvm-img convert -O raw ...
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1answer
254 views

high load and OOM-killer on domUs while pvmove

Situation xen 4.0.1 dom0 (debian squeeze) domUs all with LVs as disks: disk = [ 'phy:/dev/vg-00/domu-swap,xvda1,w', 'phy:/dev/vg-00/domu-disk,xvda2,w' ]) one VG (vg-00) with 2 PVs Goal Move all ...
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4answers
861 views

Virtal Machine Managment Control Panel - Xen/KVM [closed]

We are looking for an open-source or low cost virtual machine management control panel. We require it to be able to manage up to dozens of hypervisors and thousands of virtual machines. It should be ...
3
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2answers
1k views

RHEL5.5 yum can't see a package (xen) on repo?

hi i'm trying to install xen via yum on RHEL 5.5. When i browse the repo here: http://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/ I can see the package i want. specifically ...
2
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3answers
863 views

Web-based Ajax Console for Xen DomU?

I tried rapidxen once. They provided a web-based ajax terminal webpage, which displays tty0 on the webpage and you can type command on that webpage. It interactive with domU in ajax way, the webpage ...
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2answers
341 views

How can I fix this wrong/incomplete Xen routing setup?

I've got some Xen hosts configured in bridged mode, whose VMs use public or private IPs: Host #1 dom0: 3.3.3.71 dom1: 10.0.2.10 dom2: 3.3.3.85 dom3: 10.0.2.11 Host #2 dom0: 3.3.3.72 dom1: ...
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2answers
456 views

Java process eating up all the “low memory” on my Xen VPS

This is on Centos 5, Linux 2.6.33.3-xenU #1 SMP Wed May 5 00:49:22 UTC 2010 i686 i686 i386 GNU/Linux I have a java server process which I normally run with the following configuration -Xmx700m ...
0
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1answer
986 views

xen network-bridge makes my server unreachable

Hey, I have a problem with xen networking. I'm using centos 5.5 64bit, and have installed xen 3.4 from gitco (unofficial) repository, along with libvirt and xen-tools. I got it previously working on ...
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2answers
241 views

xen to kvm migration

i've just migrated some xen vms to kvm. so far everything is working fine. except for one little thing: when i start virtual-manager and looking at the vm's display, there is no login: prompt. i ...
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2answers
697 views

xen 4 on (hetzner) dedicated server freezes

I have a lot of trouble trying to host xen 4 on my dedicated server. I first tried centos, it had only xen 3, but everything went amazingly smooth - I had win xp up & running in few minutes. ...
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2answers
823 views

Xen limit incoming traffic speed

I've tried using 'rate' to limit the traffic speed of a VM inside the config file but that only limits the incoming traffic speed of traffic to the VM. I want to limit the speed traffic can flow both ...
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1answer
274 views

Cloudmin/Xen Problem with Internet Speed limit

I have Cloudmin setup on a CentOS 64 bit server and I have several virtual machines running on it using Xen. When I try to change the 'Maximum network speed' in Cloudmin from Unlimited to anything ...
0
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2answers
293 views

can i use a hardware nic without going through a xen brdge?

I want to use a hardware nic in a domu machine and preferably not go through a bridge, right now i have three nics and tree bridges set up with xen. they all use their own peth. I am having troubles ...
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3answers
4k views

Unable to connect Xend with virt-manager

I have installed debian 6.0.1a. I have install all XEN stuff. including xen kernel, libvirtd, ... but when i want to connect xend, virt-manager shows me this: Verify that: A Xen host kernel was ...
3
votes
1answer
758 views

Xen: Convert image to lvm with minimal downtime

My Goals: Convert all my DomUs from image-based to lvm-based Minimal downtime Minimal performance impact on other DomUs/Dom0 My plan / setup: All my images are in a big lvm-volume, all lvs for ...
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vote
2answers
581 views

How to optimize Xen Virtual Machine

My server is Core i7 Quad Core I7-860 2.8GHz, and 4 GB DDR3-1333 SDRAM How many xen could I create if each of them has 256 MB memory? How much memory should I leave to the Xen Server(1G?512MB?why?) ...
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1answer
1k views

How to use two physical NIC's inside a Xen guest?

I'm trying to make two physical interfaces visible to a Xen machine. I followed the guide (http://idolinux.blogspot.com/2008/08/xen-add-network-bridge-for-eth1.html), and created two Xen bridges for ...
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2answers
369 views

Does VMDirectPath help disk IOPS performance?

I read the VMDirectPath materials, and they say that it helps the performance on the 10Gbs card case. Sure, if multiple VMs directly access the physical 10GbE card, the VMM bottleneck is avoided with ...
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1answer
1k views

How can I change memory resources from within the DomU?

For a certain job I sometimes need more memory in a DomU (CentOS 5). The trigger for the start of the job are some conditions that I can only check within that DomU: The DomU is waiting for an upload. ...
0
votes
1answer
87 views

Migrating from Linksys by Cisco Router as DNS and DCHP Server to A Dell PowerEdge Windows Server 2008 R2 Box?

Okay so, I am not the best at this stuff, but I am going to try this. Okay, so, currently we have a Linksys by Cisco E2000 Router running our DCHP, as well as our DNS Server. We just purchased a ...
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3answers
435 views

how do i check load on a xen host

I have just started to play ariund with xen virtualization. I want to know stuff like how high the load is on the host system, how can i rind out this sort of information from when logged in to the ...
2
votes
2answers
921 views

XEN Server VM Creation Error

Has anyone seen this before and this recently started occurring when a VM boots. 4/7/2011 11:53:08 AM Error: Starting VM 'Web Server 1' - INVALID_SOURCE - Unable to access a required file in the ...
0
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3answers
347 views

XEN Server - can it send RAID warnings or errors?

I have XEN Server installed and running several VM's on a newer dell server with hardware raid. My concern is what happens if one of the drives fails? Can XEN server be configured to receive that ...
0
votes
1answer
1k views

Duplicate Key error on XenServer 5.6

We have a XenServer pool consisting of two Dell R410's running XenServer 5.6. The servers are connected to a few iSCSI NAS devices. Lately, as I've been looking at the /var/log/messages I've been ...
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2answers
846 views

Best practices for mounting Sun SAN NFS on Linux (Debian Squeeze)

Anyone got bestpractices for how to mount a nfsshare from Sun(Oracle) Unified Storage? We run the usual hard and nfs4 on debian squeeze. We run our VMs through this NFS share with Xen. When our SAN ...
0
votes
3answers
1k views

NTP time sync not working in a DOMU Centos 5.5 server

I have a Xen Centos 5.5 server with ntpd working in virtual server. NTP time sync seems not working. I have disabled any firewall. my grep -i ntpd /var/log/messages output: Apr 1 16:15:47 ...
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2answers
133 views

Configuring Initial networking of DOM-0 in XEN

I have installed CENT OS 5.4 with Hypervisor(XEN) on a blade server. When I log in in to the console and fire the command 'xm list', I can see domain-0. So Hypervisor is installed successfully. But I ...