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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Xen Vif creation xl vs xm

Hi everyone, I switch my server from a xend/xm Xen install to a 4.1 xl Xen install. Therefore Xen does not create vif network interface when I launch xl create /etc/xen/my_server.cfg but does create ...
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Xen Versions

Does anyone know the difference between version of xen produced by xen.org and Citrix XenServer? I can't seem to find any mention of the differences between the two? Thanks
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CentOS network bridging and Xen

I'm using CentOS 6 and Xen 4.6 on a bare metal machine. I'm trying to install ubuntu as a guest but I fail in the networking section. (I use netboot image). I have two eths named eth0 and eth1. ...
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Where is my new hard disk Citrix Xen Center

I'm trying to create a new storage repository on a server that already has 2 old hard disks, set up with hardware RAID 1. It's my first time doing this in Xen Server environment so I wanna be extra ...
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Blank LVM partition after recovery. Where is the data?

colleagues! A few days ago, the logical volume has been removed from one machine. Today, it turned out that there were still important data. No problems, everyone knows vgcfgrestore. Found in the ...
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1answer
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Cannot connect to Xen domU via VNC if X isn't installed on domU

I'm trying to build a Xen domU that can be connected through the Xen's VNC server. Below is the template (actually it's generated by OpenNebula): name = 'one-153' #O CPU_CREDITS = 256 memory = '128' ...
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Virsh cannot connect to Xen server

I have installed the latest version of Xen server 6.5. Now I want to connect to it with virsh (libvirt-bin). When I do this I get the error error:end of file while reading data: sh:nc:command not ...
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1answer
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Install xenserver on iscsi target

Is is know that Xen Server is based on CentOS, and it is fact that CentOS can be installed on an ISCSI target flawlessly, but I wanted to install Xen server on an ISCSI target I couldn't find a way. ...
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Error while creating VM using virt-manager on Xen

After a great struggle I got my XEN installed now I am using virt-manager and trying to create a VM. Since my H/W doesnt support full Virtualization using the Para Virtualization installation over ...
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1answer
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How to get virtualized SR-IOV Infiniband interface UP?

I've spent several days on this now and I've managed to get SR-IOV working with the Mellanox Infiniband card using the latest firmware. The Virtual Functions appear in Dom0 as 06:00.1 Network ...
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1answer
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Can I use XenServer GPU Pass-Through without XenDesktop?

XenServer documentation only covers using GPU Pass-Through ("vGPU") to run XenDesktop's "HDX 3D Pro Graphics." XenServer GPU Pass-Through cannot be used with the XenCenter VNC console and it does not ...
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29 views

Xen Server interference on ARP requests

I have a strange behaviour on my network as my unix-like hosts seem to have problems to reach the gateway. Digging into the network traffic via tcpdump, I've seen that two different hosts answer to ...
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1answer
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Bringing the xenbr0 interface up on XEN under Ubuntu 8.04

I installed XEN on Ubuntu 8.04 using this tutorial but after I reboot with the XEN kernel, I don't have xenbr0 device. I see that network-bridge script runs and it creates peth0 device, but not ...
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2answers
1k views

Blocking STP Traffic

I am using Xen virtualization with a bridged mode netwrk. I noticed that there is a lot of spanning tree (as understand) traffic coming from a network. Such as: STP 802.1d, Config, Flags [none], ...
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0answers
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What's the impact of a high cpu steal time on XenServer's dom0?

From what I understand, cpu steal time is the CPU time that the VM kernel requested, but was denied by the hypervisor because it was serving another VM. We have a XenServer that has dozens of VMs ...
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1answer
46 views

XEN kernel, CPU missing flags?

I'm using Opteron 6386SE processor, 16 cores. It's capabilites (flags) are here: CPU World But when I run cat /proc/cpuinfo (dom0 or guest), flags are missing, for example SSE3 and SSE4. flags ...
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1answer
35 views

unrecognized usb passthrough to windows server 2012 r2 on ubuntu 16.04

I have a ubuntu 16.04 lts on a intel NUC machine. I want to use a TV usb tuner, in Japan, which only works for Windows. So, I'm trying to install a windows server 2012 r2 guest VM on the ubuntu ...
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1answer
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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 ...
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0answers
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How to Reclaim Space from XenServer?

I found that the XenCenter storage tab claims there is 1096.6 GB used of 1107.7 GB total (708.5 GB allocated). It appears that some space has been eaten and not released. The SMLog shows: [13816] ...
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2answers
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CentOS 6 Xen guest fails to boot after 'yum update'. Kernel?

I Seem to be having an issue with a Xen guest not booting after a yum update. DomU Configuration: #kernel = '/boot/solus-vmlinuz' #ramdisk = '/boot/solus-initrd.img' bootloader = ...
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2answers
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Xen Remus setup

Currently, I'm running the IT for a small organization, and we just purchased a new server to replace our aging Dell poweredge. As the Dell isn't so bad as to be junk, I was hoping to set up Xen on ...
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1answer
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Xenserver 5.6 SR_BACKEND_FAILURE_47 no such volume group, but it is there

I've looked everywhere (Google, here, a bunch of other sites), and while I have found people with similar problems, I couldn't find a single one with a solution to this. Last night our xenserver 5.6 ...
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0answers
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Comparaison between OpenVZ, Xen and KVM on top of Virtualbox

I have to make a comparaison between OpenVZ, Xen and KVM. However I only have a laptop for that and I don't want to install all of them in different partitions. My question is, does it make sense to ...
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Auto Power On Xenserver 6.5

After applying updates to my xenservers I noticed VM's that were turned off turned themselves on after the server I applied updates to rebooted. I do not have any vApps configured and I did not ...
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1answer
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Xen VM won't come up: could not find bridge device xenbr0 (configured to use routed)

I am using xen 4.4.1 on an Ubuntu 14.04 server, my DomU is running Ubuntu 14.04 Server as well. I've run this DomU in bridge-mode previously no problems. However I want to switch to a routed setup. I ...
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Can't find logical volume when booting imported disk images in Xen guest

I've got a couple of drives I copied over using ddrescue to image files for booting under Xen. They contain an LVM volume group with a couple of volumes in it, which was originally split across two ...
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3answers
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How to reset root password CentOS (domU) hosted in Xen?

Need help on resetting root password of a CentOS which is a guess OS (domU) in XEN. I already tried to get to grub but it doesn't display or maybe using a different grub (pygrub). Thanks in advance.
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1answer
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Active/Active MultiPathIO to two HP d2700s?

Our XenServer 6.5 hosts connect over ethernet to shared SAS storage via a single Linux based HP DL360 G6 "bridge". This single StorageServer bridges ethernet to SAS and shares out via an iSCSI ...
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virsh (xen) not listing dom0 nor domU

I have Xen 4.4.2 installed on Ubuntu. xl list shows Dom0 and all DomU but virsh -c xen:/// list --all doesn't return anything. virsh version returns Compiled against library: libvirt 1.2.2 Using ...
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Xen migration - Error [backed has not unmapped grant]

I am trying to migrate between two servers running Xen version: 4.1.6.1 and Ubuntu 12.04.5 LTS. The problem I am currently having is when I migrate from: Server1 -> Server2 (with VNC I see this) ...
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3answers
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How to get more I/O performance from Citrix XenServer?

I have a Citrix XenServer 6.1 installed on a HP Server (1x Intel Xeon E5630 @ 2.53GHz (4 cores, 8 threads, RAM: 752MB for dom0 and 55286MB for the guests). The server has 2 scsi mirrored disks and is ...
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1answer
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Libvirt with Xen fails to start correctly Ubuntu 14.04

At the moment i'M really feeling a little helpless: I tried to setup Ubuntu 14.04 with Xen and libvirt for management. I created a VM but I did not auto-start (altough autostart is checked). If I do ...
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2answers
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Use SSHFS on XenServer 6.1

On Xen Server 6.1, to backup my VMs, I use a script based on the following tools: xe vm-list to build a list of the VMs to backup xe vm-snapshot to take a snapshot of the VMs xe template-param-set ...
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5answers
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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. ...
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2answers
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Ping only works twice

I have created a vm inside a xen host. By following this guide, I have managed to ping www.google.com, but it only ping-pongs twice before getting Destination Host Unreachable. If I restart the vm, I ...
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Xen - VM not reflecting memory

I am using Xen to hot-add memory to virtual machines, but it seems that I am not getting the correct vales in /proc/meminfo on the guest. As displayed below the guest has 2 GB of allocated memory. ...
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0answers
560 views

Xen hangs on boot when scrubbing RAM

I have a CentOS 5 server I can boot into the stock kernel just fine, but when I try kernel-xen, it gets stuck here: When I try adding no-bootscrub to the kernel command line, I get this and a ...
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How to recover XenServer vm's from a mdadm raid 1 HDD

I have an older server, namely, Fujitsu Siemens Primergy TX 150 S6 on witch i have installed XenServer 6.5.0-90233c. On it i have multiple virtual machines of different sizes of witch i need to ...
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Testing migration in vmware workstation

I have VMware Workstation 12 with two centOS guests installed, lets say C1 and C2. I am using Xen inside C1 and C2, lets say X1 and X2 respectively. I want to migrate vms from X1 to X2. I know this is ...
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Kali Linux under Xen

I've been trying to get Kali running as a guest dom, but so far the results have failed. My LVM is located at /dev/sdb --- Volume group --- VG Name vg0 System ID ...
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1answer
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Xen reduce VCPU

I am trying to reduce the number of VCPU on Dom0, but not understanding why its not reducing the number. Log: [2016-02-11 13:43:25 2550] INFO (XendDomainInfo:1977) Set VCPU count on domain Domain-0 ...
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lvcreate reports disk full, vgdisplay says space still exists

I'm attempting to create some new lvm partitions for a Xen VM. The drives are already set up - running sudo vgdisplay give me the following: --- Volume group --- VG Name n3850a-vg0 ...
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2answers
1k views

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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7answers
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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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VNC not working on XEN/libvirt domU - debian jessie

Hi recently configured a brand new server for testing purpose: debian jessie (8.3) xen 4.4 (xl toolstack) virtinst I created and started a new domU through virt-install: virt-install \ ...
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Xen+Libvirt: How to use PVH mode with Libvirt?

PVH mode is an hybrid of PVHVM and PV modes, where you use both virtualization and paravirtualization techniques for improved guest performance. It's been introduced around Xen 4.4. I'm using Xen 4.6 ...
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Migrate Virtual Machine from KVM to Xen

I'm trying to migrate a Virtual Machine from Qemu KVM to Xen Hypervisor 4.1, but have problems with it. What is the best and simplest way to do it? What I've done so far: I have installed ...
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1answer
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Linux xen directly boot windows domu? [closed]

I have the following situation: got a new notebook with Windows7 pre-installed (sda1 with boot partition, actual OS in sda2), one physical disk (sda) created an extended partition (sda3), inside ...
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2answers
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Remote automated provisioning to a XenServer Hypervisor

I'm currently working on a project where I use Vagrant with Ansible provisioning to create local environments in VirtualBox. I'm currently working with a University and we have a XenServer Hypervisor ...
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Verifying VT-D / IOMMU Support (VGA Passthrough)

I have a 4790K I'd like to use VT-D with for hardware acceleration in a Windows guest VM (Dom0 = Ubuntu 14.04) using Xen. Intel's website CLAIMS the processor supports this: "Intel® Virtualization ...