XEN is a hypervisor based virtualization technique.

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13
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3answers
641 views

Horrible situation - file systems mounted simultaneously by multiple independent OS instances

How do I get out of this situation safely? Details are as follow: A xen server has got block devices allocated to VMs. But these devices have also been mounted inside Xen. In fact 44 of these ...
10
votes
1answer
9k views

BUG: soft lockup - CPU# stuck for x seconds

I've seen a few bug reports and questions (on stackexchange and elsewhere) regarding a nagging "BUG: soft lockup - CPU#<n> stuck for <dt>s!". So far, I haven't found any clue as to what ...
9
votes
2answers
1k views

Tools for Monitoring Steal Time (st)

We're running on a virtual "dedicated" server, which should, in theory, mean that we're the only guys on the server. In practice.... I'm thinking we might not be. Notice that although it looks ...
6
votes
2answers
378 views

Mysterious write IO

I am just reviewing the disk IO of a XEN VM server. I stumbled across a DomU that has constant write traffic. To narrow that traffic further down I logged in to the DomU (CentOS 5, 64 Bit) and ...
6
votes
1answer
3k views

Xen on openSUSE 11.4

I have done a few installs of openSUSE to use as a Xen dom0 and have not got it working yet. These are the steps I followed: Installed openSUSE 11.4 from Live KDE CD. Installed all updates via ...
6
votes
1answer
1k views

Force X to use second video card so I can pass through first card to XEN VM?

So I am trying to get X to start on my second (PCI 02.00:00) video card and stop using the main card (PCI 1.00:00). I would like to do this because I want to pass through the PCI 1 card to a XEN HVM ...
6
votes
0answers
254 views

Allocated Memory difference in xen guests after using Linux 3+ kernel [closed]

Can someone explain to me why there is a memory difference in Guests with the same configuration? Hypervisor: xen 4.2 64 bit VM1: Centos 5.7 with 2.6.18-274.el5xen Assigned memory from xen is ...
6
votes
2answers
832 views

How do I configure Xen GPU passthrough for my AMD Radeon GPU?

I have an Ubuntu Server 12.10 setup with Xen 4.2.0 installed (compiled from source) and an AMD Radeon 7750 GPU. My Xen installation appears to be working and I can create virtual machines for example. ...
5
votes
3answers
1k views

What is the fastest Virtualization solution for Linux?

Is it still XEN? Or is it VirtualBox, KVM, VmWare or else? With fastest I mean that the guest VM is fast (the smallest speed loss because of Virtualization)
5
votes
1answer
4k views

What is hvc0? (appearing in “who” list)

I have an Ubuntu Server, and when I type who, to see who's connected, I can see that there's a user connected, and instead of being logged to a pts/x, he's connected to hvc0. Is there something to ...
5
votes
3answers
8k views

domain 'ubuntu-hvm' does not exists, xen + ubuntu, hvm guest os installation problem

I am following the installation/setup instructions at https://help.ubuntu.com/community/XenProposed to install ubuntu + xen. I was able to install a PV guest OS. However, when I got to the HVM guest ...
5
votes
2answers
719 views

Good tutorial for setting up a KVM/Xen box and advice on which would be better

I've got a dual xeon, 2GB, 75GB hd server that I'd like to turn into my dedicated virtual environment. Currently I'm using VirtualBox locally to run a mock cluster for Cassandra and Nginx/Haproxy, ...
5
votes
2answers
4k views

GPGPU/CUDA in KVM or Xen

We would like to enable direct access to CUDA-enabled GPUs within either KVM or Xen (or Citrix Xenserver). Specifically, we want to use PCI passthrough to access an NVIDIA Tesla S2050 unit, which is ...
5
votes
1answer
453 views

Linux process scheduling - Cap/Weight based?

I am just trying to understand the basics of Linux scheduler. Is Linux scheduler a Cap based or weight based scheduler? I was previously using Xen. Now I am moving from Xen to KVM. I read VMs are ...
4
votes
2answers
2k views

What is /dev/xvde1?

I'm having to do with an OpenShift RHEL Linux installation running on Amazon EC2. In the filesystem, there is a device file named /dev/xvde1 mounted to / ... and a device file named /dev/xvde2 mounted ...
4
votes
1answer
1k views

Running xen inside VirtualBox , possible?

Can i run a Linux system inside VirtualBox or VMware , with xen kernel ? It's not intended for a real server or production workplace , just to learn the configuration of XEN. BTW: target computer ...
4
votes
1answer
2k views

avoid IPv6 link local address on interface

I have a setup with virtual Xen hosts connected to a set of VLAN-s. On Dom0, I have set up a bridge for each of my VLAN-s to connect DomU-s to. Bridges are set up in /etc/network/interfaces like ...
4
votes
1answer
366 views

bridge does not forwarding packets centos

I am using CentOS 6.5 64 and use xen to create a virtual machine (CentOS) ifconfig [root@CentOS ~]# ifconfig eth0 Link encap:Ethernet HWaddr 08:00:27:54:B3:FA inet6 addr: ...
4
votes
2answers
696 views

VM benchmark tools?

I would like to benchmark of few XEN-constallations: PV DomU HVM DomU with PV network and disk drivers HVM DomU with emulated IDE and PV network The base will be the same VM with the same ...
4
votes
1answer
446 views

Adding wlan0 to xenbr0

I'm setting up xen on debian to do some testing and having problems with the bridge. I would like to use wlan0 as the bridge, but can't seem to get this working. Currently I have tried this: # This ...
4
votes
2answers
315 views

How to backup entire xen dom0 (on debian)

How do you go about creating a bootable backup ISO of my computer (dom0)? I have tried remastersys and this backs up everything but Xen does not work properly. LiveCDs also do not work. Does ...
3
votes
3answers
2k views

XEN Storage Repository has option type=lvm missing (XCP)

Several online documents on this subject talk about creating an SR with the option type=lvm but trying these: # xe sr-create type=lvm device-config:device=/dev/server/sr_guest1 name-label=sr1 ...
3
votes
2answers
1k views

Xen, bridge and multiple IPs on CentOS

There's a new server that is assigned 5 IP addresses. I want to use Xen to run several VMs with various services. This is my first attempt to install Xen, I use this tutorial as a guideline. Stuck ...
3
votes
2answers
928 views

replace xen kernel with non xen kernel

I have a virtual appliance in Xen format (XVA) that I wish run to on another hypervisor (MS Hyper-V). What have I done so far: I have converted the XVA to OVF using XenConvert, this resulted in a vhd ...
3
votes
2answers
310 views

Can VirtualBox run under Xen Dom0?

I'd like to turn my Linux Mint desktop into Xen host. Will I be able to use VirtualBox inside Dom0, just like without Xen? What the limitations would be (if any)? I believe, that this might not be ...
3
votes
1answer
202 views

Open luks-encrypted partition from virtual DomU LVM disk containing another LVM

I've gotten myself in a bit of a bind, here. A while ago I set up an encrypted Unbuntu 13.04 under Xen. It's virtual disk is an LVM LV. This LV was presented to the DomU as a (whole) physical disk ...
3
votes
1answer
3k views

Why would my Linux host suddently stop receiving multicast? All other nics on private network are receiving

Here is my dilemma. Suddenly, as of yesterday, multicast packets are no longer being received from eth1 (private gigabit network) from one node. Routing between all the nodes is fine, no collisions, ...
3
votes
2answers
5k views

Unable to boot VM: Error 13: Invalid or Unsupported Executable Format

I used VMWare vConverter and everything converted fine, but when I try to boot I get an error: The physical machine boots correctly, so I don't think it is a source machine issue. I am not sure why ...
3
votes
1answer
917 views

Debian 6.0 and Xen PyGrub failure

On my VPS (running Debian 6.0 on Xen with PyGrub) I get the following error when trying to upgrade the system: Searching for GRUB installation directory ... found: /boot/grub warning: grub-probe ...
3
votes
1answer
109 views

XEN stop all virtual machine when shutdown

I am using XEN on CentOS 6.5 64 I want a way to stop all virtual machine when XEN server shutdown I build service call in stop xm shutdown -a but not working #!/bin/bash # chkconfig: 2345 95 20 # ...
3
votes
0answers
140 views

Creating a private network for internal VMs

I am trying to configure a private network for use with my Xen VMs, in addition to the public network in use by another of the VMs (VM1, which has its own public IP). So far, I have the public side ...
3
votes
0answers
1k views

PCI passthrough with Xen

I am trying to run Windows XP in a Xen DomU virtual machine with a PCIe device, for which there are no Linux drivers, being passed through from a Debian Squeeze Dom0. My hardware supports ...
3
votes
1answer
603 views

Xen domU fails to start with kernel panic

My dom0 is Gento 3.3.2, the kernel is compiled with Xen support. And I am planing to use the same kernel to boot my domU. This is my domU configuration file: 1 vif = [ 'bridge=xenbr0' ] 2 vcpus ...
3
votes
2answers
167 views

Live-migration of a SLES9 DomU?

With SLES9 SP4 we managed to set up a XEN PV DomU. We are using SLES10 SP4 as Dom0 and DRBD 8 as disc-backed: a drbd-device corresponds to xvda in the DomU. The DomU uses the xenblk and xennet ...
2
votes
2answers
4k views

telnet to localhost and loopback device IP works, but not LAN ip (Xen + Ubuntu)

I have set up Xen + Ubuntu per the instructions at https://help.ubuntu.com/community/XenProposed. I am now ready to install a HVM guest OS (Ubuntu Desktop 12.04). After I start my HVM guest OS xen ...
2
votes
2answers
409 views

My Atheros Ethernet network drive is not working with Xen Redhat client

First I am a beginner in use Linux operating system, and I am not familiar with the error messages I have TOSHIBA Satellite laptop Intel (R) Core (TM) i5-4200m CPU I have installed Red Hat Enterprise ...
2
votes
2answers
4k views

Mounting LVM2 volume gives me 'mount: you must specify the filesystem type'

I have a LVM2 Volume Group 'vgXEN' with a Logical Volume in it called 'test-disk'. This is the output of lvdisplay: --- Logical volume --- LV Path /dev/vgXEN/test-disk LV Name ...
2
votes
2answers
771 views

Different Kernel in DomU than in Dom0 on xen

If my Dom0 on Xen is kernel 2.6.18 with xen 3.3.1 can i boot a, say, 2.6.34 kernel in a DomU ? Background: 2.6.18 runs like a charm on Dom0. Don't want to update here, because there is special ...
2
votes
2answers
5k views

XenServer how can I shrink the virtual drive of XenServer domU?

How can I shrink the virtual drive of XenServer image?. I gave 300Gb of space for one image (domU) and that was mistake. Now I want to shrink it. How can I do that? The system is already set up and ...
2
votes
1answer
469 views

How long should it take to generate 300 bytes of entropy on a VPS?

I'm running NetBSD on a Xen VPS, and I'm trying to generate a gpg keypair. I've gotten most of the way there, but now I'm getting the following error message: Not enough random bytes available. ...
2
votes
2answers
664 views

device mapper on RHEL6 unable to create devs for LVM logical volume

I have XEN guest running RHEL6, and it has a LUN presented from the Dom0. This contains an LVM volume groups called vg_ALHINT (INT for Integration and ALH is an abbreviation of its Oracle database ...
2
votes
1answer
164 views

No usable clock interface found

I just finished installing a paravirtualized archlinux guest on xen. I get the following error when my guest boots: [1.185226] i8042: No controller found [1.1247134] drivers/rtc/hctosys.c: ...
2
votes
1answer
646 views

Learning how to build my own linux kernel

Reference - http://www.linode.com/wiki/index.php/PV-GRUB#Building_Your_Own_Kernel In order to work with Xen, a number of options that must be selected: CONFIG_PARAVIRT_GUEST=y CONFIG_XEN=y ...
2
votes
1answer
5k views

Getting “cpio: Bad magic” when trying to rpm install into a mounted Logical Volume

I need some help with this. I am trying to follow the Xen guide to provision a domU using package installation of the Fedora 15 release (the dom0 is CentOS 5.6). Ive run the rpm install command with ...
2
votes
1answer
600 views

Measuring CPU %steal on VMware and Hyper-V hypervisors

For Xen Linux guests, %steal time is readily available via top and other utilities. Is it possible to get this and related metrics from within a Linux guest when running a non-Xen hypervisor such as ...
2
votes
2answers
150 views

Moving a Xen DomU to a new block device

I am busy replacing the (SAN attached) storage configured for this XEN host. Is there some way to "move" the domU from one block device to another on the same host, possibly something similar to live ...
2
votes
2answers
2k views

no network on domU in network-bridge configuration for Xen-4.0

I created a very standard Xen-4.0 domU with network-bridge configuration. However, no packets get out from the virtual machine to the network which bridge (peth0) is attached to. From guest I can ping ...
2
votes
1answer
660 views

Can rpm handle an install of another OS into another Logical Volume?

I am trying to install fedora as a domU under a CentOS dom0 using the method outlined in The Book of Xen. I have asked another question regarding a consistent error message of cpio: Bad magic when I ...
2
votes
0answers
92 views

Limit CPU cycles inside of Xen

I'd like to run some minimum-expectation benchmarks on EC2, but I'm having an issue of high variability in my output data. Specifically, they keep giving me more CPU than I'm minimally entitled to, ...
2
votes
1answer
486 views

Booting from ISO in Xen Paravirtualized Environment

Specifically, Citrix XenServer 5.6. I can map the an ISO from a Storage Repository with no issues and mount it inside the OS but I can't boot from the DVD drive without converting it to HVM, which ...