Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [xen]

XEN is a hypervisor based virtualization technique.

The XEN Wiki is propably the best starting point for further information.

Citrix owns the rights on XEN, but from time to time an "elder" release is released as open source. That open source version is being used by some Linux distributions.

The Hypervisor is loaded instead of a normal linux-kernel. After that a priviledged virtual system is loaded (called Dom0). That system is used to steer the Hypervisor - i.e. Network and Disk resources, whereas RAM and CPU are in control of the Hypervisior.

Other VMs are called "DomU". These can be fully XEN-awary with a special XEN-Kernel, able to run in PV (para-virtualized) mode. Other System can run in fully virtualized mode (HVM), but can use PV-drivers to access network and disk resources faster.

Currently known distributions that use the OpenSource XEN:

  • RedHat 5 (and clones), Version 6 does not support Dom0 any more.
  • Oracle VM (based on a RedHat Clone as well)
  • SLES 10 and 11
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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# stuck for
s!". So far, I haven't found any clue as to what to do or try (rather, the clues I've found and followed…
Pierre D
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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 block devices have been mounted like this. To make…
Johan
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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 like we're killing our machine, "Steal time" is at…
mgjk
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What is Dom0 and how can one use it?

I have heard that Xen is now fully included into mainline Linux, and is usable via Dom0. What is Dom0, what is its purpose? How can one use it?
orftz
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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 composed of 4 Tesla C2050 devices. I'm aware…
jwalters
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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, but it's starting to overload my system. I'd like…
Michael
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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)
LanceBaynes
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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 ESXi or Hyper-V? For Windows guests, both VMware…
Yolo Perdiem
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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. I have set up a virtual machine and it appears…
Dead-i
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Why cannot I ping an xen domU with Bridge mode connection?

I am on a Debian upgraded from 7.11 to 8.5, so the xen package is upgraded from 4.1 to 4.4. I do not know much about networks, but when I see a diagram like this (taken from the Xen Networking wiki page), I expect to be able to ping 198.51.100.27…
sikerbela
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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 YaST>Package Management. Installed Xen via YaST>Install…
kemra102
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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 VM and use the second card as the main display for…
Jim DeVito
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Allocated Memory difference in xen guests after using Linux 3+ kernel

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 exactly the same as memory inside guest, 524288k…
ananthan
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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 this: auto eth0 iface eth0 inet manual auto…
Rolf Rander
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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 started iostat 5. It shows sda1 active with 130-190…
Nils
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