Questions tagged [xen]

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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Intel Atom 330 as a server machine [closed]

That's the processor I'm thinking about getting for a home server / development machine. Going for $80 as intel motherboard + dual core processor combo is a really tempting deal. What I'm planning to ...
Karolis T.'s user avatar
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6 votes
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Cloud vs traditional iSCSI, xen, drbd, etc

I was wondering, how does a 'traditional' virtual machine setup with storage on iSCSI, with a fallback using DRBD, nodes with Xen installed the 'normal way', storing their images on the iSCSI target, ...
Halfgaar's user avatar
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6 votes
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Weird nfs performance: 1 thread better than 8, 8 better than 2!

I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a ...
Joe's user avatar
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6 votes
2 answers
3k views

keepalived issues on xen domU

I cannot manage to run keepalived correctly on xen domU. I am following this link for configuration, and it works great on some local VM (running with KVM). If I set up the exact same configuration, ...
David Cournapeau's user avatar
5 votes
4 answers
417 views

Virtualization for hardware resiliency?

Can anyone tell me if it is possible to pool several physical servers to run a resilient virtualization environment. Our servers are getting more and more critical to our clients and we want to do ...
Kev's user avatar
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2 answers
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How to change boot device on vm installed on Citrix Xen Server to DVD

I have installed Centos 6 on my new Xen Server (XenServer release 6.2.0-70446c). Everything went smooth. System is working fine but now I want to change boot device on that VM to boot from DVD (iso ...
B14D3's user avatar
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5 votes
7 answers
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Secondary IP (eth0:0) acts like main server IP

I have a CentOS server, configured with 4 consecutive IPs: eth0 5.x.x.251 eth0:0 5.x.x.252 eth0:1 5.x.x.253 eth0:2 5.x.x.254 The problem is that all traffic goes out to the internet with eth0:0 (...
George Tasioulis's user avatar
5 votes
4 answers
26k views

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/...
Karolis T.'s user avatar
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5 votes
2 answers
8k views

Ubuntu on VPS becomes unresponsive: BUG: soft lockup - CPU#0 stuck for 22s

We have a VPS running Ubuntu, on Xen. The problem is this, about once a day, for about 20-50 minutes, at a random time, the server becomes completely unresponsive to the outside world. After this ...
Blake Walsh's user avatar
5 votes
3 answers
11k views

Ubuntu 12.04 Netinstall URL? Xen Host

Well I have an Xen server, I've got a CentOS container up fine but a friend of mine wants (oh god) Ubuntu Server 12.04, why he can't use Debian is beyond my understanding. But anyways, I can't ...
notFound's user avatar
5 votes
2 answers
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LVM is reporting I/O errors, but the disk reports no problems. Argh

I've started seeing errors reported by LVM on certain Logical Volumes (and by Xen when attempting to create virtual machines on these LVs). But I've run tests on the disk, and can't see any hardware ...
andrewf's user avatar
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5 votes
1 answer
11k views

Can I safely uninstall "Citrix Tools for Virtual Machines"?

Having several virtual servers with Windows 2008 R2 at our web hoster (Germany's "1&1", they seem to use Citrix Xen), I have every now and then some servers that hang (RDP login screen hangs ...
Uwe Keim's user avatar
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3 answers
2k views

server virtualization: hypervisor (xen) or virtualbox?

I just set up a debian server for websites but now I need to install a windows server on the same machine because I need to run a game server (windows-only). Virtualbox is already installed on my ...
Eliasdx's user avatar
  • 277
5 votes
2 answers
4k views

Running KVM/XEN/Hyper-V VMs from a RAM disk, is this possible? Practical?

Currently I'm using ESX (v3 and v4) to test a scripted OS (Windows 2003) and application install DVD. The DVD ISO (8GB) is mounted on a 1Gbps NFS datastore and the VMDK's (20GB) are on an SSD mounted ...
Ausmith1's user avatar
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1 answer
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Moving LVM volume group from one physical disk onto another

I'm an out-of-my-depth PHP developer who has to deal with the following sysadmin problem. We have an Ubuntu (Ubuntu 14.04.1 LTS) server running Xen (xen-hypervisor-4.4-amd64 4.4.0-0ubuntu5.1). It has ...
herbert_zer0's user avatar
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1 answer
2k views

Difference between Processors and CPU core

can any one please clarify the difference between actual no of processors and CPU cores. in my case i am having Intel Xeon® Processor E5620 as per intels product page: its having # of Cores 4 # of ...
keeth's user avatar
  • 53
5 votes
2 answers
7k views

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 (...
djsumdog's user avatar
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5 votes
2 answers
2k views

Performance and Utilization monitoring of Xen Dom0

We run a mixed bag of Citrix XenServer and Gentoo/Xen virtualization platforms in our company. In general, we use XenServer where we have shared storage (SAN, iSCSI or whatever) and Gentoo/Xen where ...
user avatar
5 votes
1 answer
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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 ...
danorton's user avatar
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5 answers
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vmware server end of life, where to go now?

We have some virtual machines on vmware server 2.x running on 64 bit hardware and quite happy with it. As vmware server will no longer be offered we are thinking to migrate to ESXi, which seems is ...
user12096's user avatar
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4 votes
3 answers
18k views

Machine check events logged

In /var/log/messages, this error occurred: Sep 19 13:18:15 wdc kernel: [2772302.630416] Machine check events logged Shortly there after, the entire server became unresponsive. This is in the log of ...
GoldenNewby's user avatar
4 votes
5 answers
8k views

ntpdate not updating system time in XenServer VM

We have a Debian webserver that I am trying to use ntpdate to keep the time in sync. When I run ntpdate ntp0.cs.mu.oz.au I receive 16 Sep 10:55:36 ntpdate[21626]: step time server 128.250.36.2 ...
LukeR's user avatar
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4 votes
3 answers
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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 ...
edude05's user avatar
  • 321
4 votes
6 answers
975 views

What do you recommend? OpenVZ or Xen DomU?

I’m looking for a new server at the moment and a fitting virtualization solution. On my recent server I’m using VMware server but don’t what this one anymore as it is very very slow. I have the ...
Ulf's user avatar
  • 387
4 votes
4 answers
2k views

Xen or KVM? Please help me decide and implement the one which is better

I have been doing research for implementing virtualization for a server running 3 guests - two linux based and one windows. After trying my hands on Xenserver, I am impressed with the architecture and ...
user avatar
4 votes
2 answers
1k views

Xen - Make one guest OS have 2 cpus?

I have inherited a Xen setup. The dom0 and domU's are all linux. dom0 has 8 cores (or CPUs, I'm not sure). We want to run more stuff on one domU. I want to make it a multicore CPU, ie so that the domU ...
Amandasaurus's user avatar
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4 votes
3 answers
2k views

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 is-...
Icu's user avatar
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4 votes
2 answers
5k views

Changing XEN VM configuration

What is the correct way to update a XEN VM configuration? In this case I want a specific domain to stop using /dev/emcpowerg and use /dev/emcpowerh in stead. I have ensured that the two devices have ...
Johan's user avatar
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4 votes
5 answers
3k views

Xen only sees 512MB of System RAM. Should be 8GB. (UEFI boot)

I am booting Xen 4.0 from Debian Squeeze, kernel 2.6.32-5-xen-amd64. "xm dmesg" on dom0 shows: Xen-e801 RAM map: 0000000000000000 - 0000000000091400 (usable) 0000000000100000 - 0000000020000000 (...
lmz's user avatar
  • 379
4 votes
4 answers
17k views

Citrix XenServer: how to add RAM to a guest VM without XenCenter?

Is it possible to add RAM to a guest VM in without using XenCenter, but from the host machine console or a remote machine?
Alexander Gladysh's user avatar
4 votes
3 answers
3k 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 ...
cooldfish's user avatar
4 votes
4 answers
2k views

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), ...
Christoph Strasen's user avatar
4 votes
1 answer
343 views

How can I convert a iSCSI system disk from XenServer to another format

Perhaps this is quite a silly question. I installed a new VM on XenServer. It loads the full system from a iSCSI from a NAS. Now I am planning to migrate to Proxmox as XenServer falls short regarding ...
kankamuso's user avatar
  • 487
4 votes
3 answers
3k views

Xen HVM guest has severe clock drift

I am seeing a very severe clock drift on my Xen HVM VPS, rented from a hosting provider, so I don't have access to the dom0 system. I continuously run ntpd, but the clock drifts by as much as 30 ...
ipartola's user avatar
  • 141
4 votes
4 answers
1k views

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 ...
wag2639's user avatar
  • 2,165
4 votes
4 answers
3k views

Which is the best inexpensive way to manage five virtualization hosts?

for the 5 (physical) servers in our datacenter, I'm looking for a unified virtualization design. All 5 servers do not come with hardware virtualization support (older XEONs). Since we're an NGO on low ...
andreas-h's user avatar
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4 votes
2 answers
986 views

How do I make all Xen guests use their host clock value?

I've set up Xen server under Linux with several guests running, and all was well. After some time I've noticed the clock on the server drifted away, so I installed 'ntpd', and the clock was back to ...
dragonroot's user avatar
4 votes
1 answer
149 views

How does a VM hosted on xen knows that it is in a virtualized environment [closed]

I have read that in para virtualization hosted virtual machines are aware that they are being virtualized, and this allows them to increase their performance. But, how does the hosted machine know ...
Damodaran's user avatar
  • 143
4 votes
1 answer
574 views

PCI DSS compliance on a virtualized server running Xen

I have a server running xen with HVM and would like to make one VM PCI compliant. I've read the PCI virtualization guide and it says that I need to make sure there is no information leakage between VM'...
devnill's user avatar
  • 307
4 votes
1 answer
3k views

How to expose virtual 10Gb ethernet port to Xen Domain

I would like to expose a virtual 10Gb ethernet interface into a Xen HVM domain. The base OS is Debian Squeeze, 2.6.32 kernel, Xen 4.0. Is there any way to make this happen without actually having a ...
Nick Bastin's user avatar
4 votes
2 answers
2k views

Convert Amazon AMI to local Xen machine

I have an AMI which was created from a base AMI on Amazon. I would like to bring a copy of this internally to run for development. I have downloaded the .manifest & part00-50 files (approx 550mb) ...
AliGibbs's user avatar
  • 2,323
4 votes
4 answers
3k views

Visualizing Xen Performance and Utilization

VMWare's vSphere console and Veeam's monitoring utilities do an admirable job of showing admins various statistics on CPU usage, memory usage, percent utilization, etc. of VM's and the hypervisor host....
Bart Silverstrim's user avatar
4 votes
1 answer
1k views

VM transfer speed between XCP-ng (XEN) servers

I have two HP DL380 G8 servers with 4x 1TB on HP p420 RAID controllers in RAID 1+0 setup. Eth0s are connected to the router, and Eth3&Eth4s are bonded (LACP) and connected directly between ...
Sakvojage's user avatar
4 votes
2 answers
2k views

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 ...
Halfgaar's user avatar
  • 8,194
4 votes
2 answers
2k views

Backup Xen domU machines

This is similar to my last question except that my last question included "while running" in the title. I've since learned that this isn't exactly possible. Here is my understanding of the options (...
Jonathan Hawkes's user avatar
4 votes
1 answer
2k 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 ...
zoot's user avatar
  • 267
4 votes
3 answers
3k views

How should I upgrade debian/xen machines from etch to lenny

I manage a server that currently runs Debian/Etch, and Xen 3.0. Each virtual machine is also running Debian/Etch. Lenny is the next release of Debian, and includes Xen 3.2. Unfortunately, I believe ...
John McAleely's user avatar
4 votes
2 answers
5k views

bash: convert date from to unix timestamp changes timestamp

Running the following command at the xen-servers (either DOM0 or DOMU) at $company gives me a negativ number, on every other system zero (0) (even in my cygwin). date -d "1970-01-01T00:00:00" "+%s" $...
killermoehre's user avatar
4 votes
2 answers
28k views

Xen / libvirt - "End of file while reading data: Input/output error" when attempting to start a domain

I'm getting the following string of errors when I attempt to start a domain using virsh: virsh # start vimes error: Failed to start domain vimes error: End of file while reading data: Input/output ...
Adam Luchjenbroers's user avatar
4 votes
1 answer
40k views

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 ...
Dan Moulding's user avatar

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