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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FreeBSD XEN kernel not booting in XenServer 6.2

I have a XenServer 6.2 host, and I am trying to get a FreeBSD-9.1-i386 guest to run in PV mode. The installation of the guest is fine, but after a reboot with the new kernel the system does not boot. ...
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36 views

OpenVPN Bridged VMs

I have two servers. One contains few VPS which acquire IP via OpenVPN bridge from another server. So setup looks like this: Internet -> (ServerA.br0 -> ServerA.tap0) -> (ServerB.tap0 -> ...
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1answer
68 views

How to bond NIC on a virtual machine?

I'm puzzled about this process. Historically when I've setup an LACP bond on a piece of physical hardware I have to create the analogous setup on the switch. How does this work with a virtual machine ...
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2answers
199 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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56 views

Linux networking: issues with connection loss using xen virtualised xen guests (?)

I am encountering strange issue. I've several xen virtual machines deployed at HP Proliant Servers (120,360,380 gen5,6,7 - different). Some of them are PVM XEN running linux guest, some of them ...
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4answers
2k views

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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59 views

Xen dom0 rebooting

I am using Xen version 3.0.3 and running 4 domU's on this.(guest OS is windows) suddenly my dom0 reboots for no reason.This is happening frequently for last 2 days. I checked xend and system logs but ...
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90 views

OpenVPN bridging for Xen VMs

I have a following situation and need your help. My client has several servers-routers in different GEO regions and some servers within one DC which are used for a Xen virtualization each. Routers ...
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2answers
116 views

Why would you use Xen as opposed to OpenVZ for trusted Linux-only host/guests? [closed]

Every time I need to create VPSs out of one of our machines, I (re)think the virtualization technologies, and seem to end up with OpenVZ being the most suitable for performance reasons when all I want ...
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1answer
265 views

Xen USB pass through

Running the Xen (Debian). I want to access the iKey USB dongle from Windows DomU. I have 2 PCI: lspci: 00:14.0 USB controller: Intel Corporation Lynx Point USB xHCI Host Controller (rev 04) 00:1a.0 ...
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2answers
144 views

Considering XenServer: mixing hardware configurations?

I'm having an internal debate over using XenServer and hoping for some info from 'those who are more informed'. Specifically: VMWare states that it's not a great idea to mix hardware of different ...
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84 views

XEN, VM not starting after reboot VM

Ubuntu 13.04 raring, XEN 4.2 x64. When I reboot in VM OS, VM is shutdown and not starting automatically. (VM State is OFF.) Server message: [2013-09-05 17:37:43 20103] INFO (XendDomainInfo:2079) ...
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0answers
59 views

Openstack Single Physical Network

I am trying to deploy openstack grizzly on a 12 node cluster. I want to use the xen hypervisor. I currently have xenserver installed, and I have 3 virtual machines running Ubuntu 12.04 to use for the ...
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4answers
2k views

XenServer for NAS and Virtualization

I'm very new to all this so please go easy on me! I'm wondering whether you can run a NAS and virtualization with XenServer on the one box. Basically, we need virtualization and we've picked ...
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9answers
18k views

LVM snapshots as a backup strategy

How viable as a backup strategy would be periodical LVM snapshots of xen domU's? Pros, cons, any gotchas? To me it seems like the perfect solution for a fast, brainless restore. Any investigation ...
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45 views

Install XenMotion on XEN hypervisor

I want to enable Live Migration on XEN 4.2 Hypervisor (www.xen.org). XenMotion (XCP) seems to do the job. Is it possible to install XenMotion on top of Xen Hypervisor without losing the configuration ...
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70 views

How to increase or decrease the ram(memory) of vm in XEN by xl config-update..?

i am experimenting xen 4.2.1 and its features. xl config-update i created the vm with memory of 512. and i entered into the vm, Now i want to increse the memory to 1024 without destroying the ...
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1answer
74 views

Xen: what are domU kernel config requirements for live migration?

We recently added iSCSI storage to two Xen servers running a mix of Gentoo and Ubuntu 10.04 and 12.04 domUs. When trying out live migration of domU I found that I can migrate just fine the Ubuntu ones ...
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3answers
384 views

Cheap machine with Xen to have more than one personal dev servers with RAID option?

I do not have a lot of money so when I need a personal dev servers I decided I will use Xen on one machine to run various OS's. Although, I really like Dell Zino ...
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1answer
82 views

XEN VPS Speed Limited [closed]

I am just wondering if people can help me troubleshoot something. I currently have a dedicated server with Xen SolusVM set up on it. The VPS seems to be limited on its download speed. I ran a test ...
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94 views

Xen Kernel - Only One Core Showing

So I have a dedicated server running the Xen kernel but for some reason it only shows one core instead of 4? Does that mean that my VPS that is running is only getting access to the 1 core or do they ...
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2answers
31k views

Difference between Xen PV, Xen KVM and HVM?

I know that Xen is usually better than OpenVZ as the provider cannot oversell in Xen. However, what is the difference between Xen PV, Xen KVM and HVM (I was going through this provider's specs? Which ...
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3answers
764 views

VNC connection to EC2 instance without installing a VNC server

I was wondering if it was possible to connect to an Amazon ec2 instance via VNC, but instead of installing a VNC server in the target machine, somehow connect it to the hypervisor's graphics output ...
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1answer
106 views

xen domains could not connect to the internet via xen domU router

I'm trying to configure xen guest to act as a router for 2 more guests. Here is the configuration: xenbr0 IP: 192.168.1.100 netmask 255.255.255.0 gw 192.168.1.1 domain router router0 ...
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1answer
300 views

Xen dom0 not forwarding to domU over bridge

My setup is about as basic as you can get. I have 2 interfaces on dom0 (Debian Squeeze), eth0 and eth1. I created a bridge for eth1 to forward packets to domU that has a public IP address. I can ...
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114 views

Installing Xentools on Openfiler 2.99.

I've been attempting to follow this link. http://www.juggled.co.uk/archive/latest/xstools4openfiler.html Had to install rpm from a different repository due to rpm.conoary.org not being accessible. ...
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3answers
236 views

hypervisor performance when running from USB

Just wondering if there is any performance impact / degradation when running from USB key I'm planning on using KVM or xen, since my servers doesn't have on board raid controller, I'm planning on ...
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1answer
63 views

Bridging virtual machines on xen

I have a dedicated server, running xen and a few virtual machines set up as separate entities with their own IP addresses. I have about 16Gb RAM left, and I would like to create a few more virtual ...
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1answer
194 views

Xen DomU ethernet driver seems not loading

Problem The Ethernet virtual device of my DomU doesn't seems to load and I can't explain why. Context Dom0 Info Dom0 : Debian Wheezy with Xen uname -r : 3.2.0-4-amd64 Dom0 dmesg ...
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62 views

Citrix XenServer maximum guest vMemory / vCPU

I am trying to find out what is maximum virtual memory available to VM with Xen Hypervisor. Virtualization Matrix and Xen User Guide tells that 128 GB is maximum vmemory for guest but is it true? Has ...
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2answers
2k views

Xen Paravirtualized Guest - Invalid Kernel

I have set up xen on ubuntu server 12.04 LTS. I have tried installing a guest to an lvm I created called xen-lvm The virt-install script: sudo virt-install \ --name client2-ubuntu-server \ --ram 512 ...
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1answer
275 views

Why is LVS dropping packets?

I am currently trying to get down to the core of a problem where my LVS-director seems to drop a packet coming from a client from time to time. We have this problem on our production systems and can ...
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1answer
227 views

Proposed Network Design for DMZ with Server Virtualization?

I have the following proposed network design that I will be implementing. All connection for server and PCs are connected through an All in One cisco firewall Only one high end server will be used. ...
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1answer
51 views

Rate Limit Xen DomU Network Traffic

Is there a solid way to rate limit Xen DomU Network I/O Traffic? I found an answer on here using tc but I get this error: Object "qdisk" is unknown, try "tc help". I guess a solution to either of ...
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1answer
504 views

Kernel parameters mem and dom0_mem in XenServer 6.1

We are running XenServer 6.1 in production, and recently had OOM-killer fire and eventually take down one of our blades. I noticed that in the kernel logs from the oom-killer instance that it seemed ...
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1answer
225 views

How can I install a new xenserver dom0 kernel?

Since Citrix released the full source code to xenserver 6.2 I've been evaluating it. It's works very well, but there is only one problem that I haven't solved. Unfortunately, Citrix do not supply the ...
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1answer
63 views

xm re-create configuration file from existing vm

I have Xen set up and working quite nicely. When I reboot and use: xm list I get this output: Name ID Mem VCPUs State Time(s) Domain-0 ...
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1answer
23 views

start xen vm using cli, without creating configuration files

Is it possible to start virtal machine without creating configuration files? Only by specifying all configuration parameters through command line, like QEMU. Can you give some references or examples?
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1answer
697 views

Compiling kernel from source (for Xen), do I use plain kernel?

My VPS host uses Xen, and instead of using its custom kernels I could use my own (with pv-grub), the sample kernel of which I had installed to test this was is the following, I am running Debian 6 ...
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1answer
85 views

Xen hvc0 console size

Hello I got a Xen running using hvc0 for the guests. Everything works fine except for the size (lines and rows) of the console: It's always 80x25 what makes editing awkward sometimes. If the line one ...
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2answers
5k views

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 ...
2
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1answer
132 views

SAN: is it better to have separate LUNs for operating system and data of virtual machines? [closed]

We have an iSCSI SAN that will be used as backing store for virtual machines. We use Xen and will directly present the LUNs as block devices of VMs (so there is no file system with files on it for ...
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2answers
897 views

Why is OOM killer hitting here

We have some VMs running kernel 2.26.26-2 under xen 4.0.3 with different CPU and RAM amounts and on some seeing almost random OOM events each rendering the VM unusable. Output is as follows, I have ...
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2answers
237 views

Can any one clarify this on xen cloud platform/xen server

As per XCP documentation, Xen Cloud Platform host is a 64 bit x86 server-class machine devoted to hosting multiple VMs. on blog.citrix.com they are mentioning about dom0 as It should be noted that ...
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1answer
153 views

No traffic to Xen vif attached to Openvswitch

I'm trying to get my guest VMs to use an openvswitch on Ubuntu 12.04 with 3.8.0-26-generic. I've compiled the most recent stable build Xen 4.3.0 but can only get my guest VMs working with a standard ...
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4answers
205 views

Allocated Memory difference in xen guests with Linux 3+ kernel

Can some one explain me why there is memory difference in Guests with same configuration: Hypervisor:xen 4.2 64 bit VM1: Centos 5.7 with 2.6.18-274.el5xen, Assigned memory from xen is exactly same ...
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2answers
836 views

Determine which guest is running on XEN: HVM or PV guest

I'm working with a Xen host which is installed XenServer from Citrix by someone. He already installed a lot of CentOS 5.2 guests on the host. I wonder how to check those guests to know they are PV ...
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2answers
1k 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 ...
6
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1answer
857 views

Windows 8 virtualization gives BSOD 0x0000005D

I find that, when trying to run windows 8 on Xen cloud (and also when running it in ESXi), the installer bluescreens with 0x0000005D (UNSUPPORTED PROCESSOR) Initially I thought it was giving the VM ...
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1answer
29 views

Multiple VMs mounting and writing on the same partition

I have multiple VMs ( XEN domains ) which are getting data and writing it on a directory in a ext4 partition. Is this going to introduce data loss or corruption?