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.
71
votes
4answers
11k views
Why is TCP accept() performance so bad under Xen?
The rate at which my server can accept() new incoming TCP connections is really bad under Xen. The same test on bare metal hardware shows 3-5x speed ups.
How come this is so bad under Xen?
Can you ...
30
votes
7answers
57k views
Xen vs KVM in performance
What is faster on same hardware - Xen or KVM?
I'm trying to pick-up a virtualization technology to work, which gives the best performance.
There are some benchmarks here that I found on the subject:
...
14
votes
2answers
23k 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 ...
12
votes
9answers
17k 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 ...
11
votes
6answers
2k views
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 ...
11
votes
2answers
1k views
How to disable “safely remove hardware”
I have some windows 7 virtual machines in xen that have devices showing up in "safely remove hardware".
I don't want users to ever be able to remove/eject any hardware at all.
I'm told vmware has a ...
10
votes
8answers
6k views
Tough Choice: Xen or KVM
I'm building a fresh workstation and want to use Linux alongside Windows. This seems like a good opportunity to get acquainted with with either Xen or KVM.
So I face a choice. In favour of using ...
10
votes
3answers
2k views
Optimizing Apache and MySQL on Linux Xen VPS
I have a Xen virtual private server (VPS) running Ubuntu 8.10, with 128M RAM.
I've found several "how to optimize Apache and MySQL for low-memory VPS" pages via Google, but they provide contradictory ...
8
votes
1answer
4k views
VDI Comparison - VMWare View vs. XenDesktop vs. Sun VDI
We're looking at implementing a VDI solution where I work. Currently, we run a mostly Linux shop with Windows clients (Samba PDC too). We've been evaluating a VDI solution for use and was wondering ...
8
votes
2answers
18k views
Having Mac OS X on a XEN virtual machine
Is it possible to have Mac OS X guest on a XEN host?
If yes, how?
There are difference for Mac OS X Server?
In particular I'm interested in the installation of a testing Mac OS X Server inside a ...
7
votes
14answers
2k views
Which Linux-Virtualization to choose for Server?
Hy,
I got a brand new Intel i7 Server-System with 12GB Ram and I want to consolidate three other linux-servers onto this machine using virtualization. I want to use the harddisks (via a kind of LVM) ...
7
votes
8answers
2k views
Which virtualization platforms should I choose, Xen or OpenVZ?
I am upgrading my shared hosting to VPS hosting, mainly to just add server administration skills to my development skills, so I'm facing a lot of new choices just signing up.
I need to choose a ...
7
votes
3answers
5k views
Xen image file vs partition/LVM volume performance
I read quite a lot of advice to switch from file-image VM storage, to partition/LVM volume based.
The claim is that partition/LVM are much faster then image files.
The downside in my opinion, is ...
7
votes
2answers
1k views
Xen vs KVM: Which will have likely better support (read:bugfixes) in the future?
I don't care about GUI or tools, but I do care about stability and performance. If I'm running a FreeBSD firewall and a Opensolaris file server as guests, will I get better stability or performance ...
7
votes
3answers
901 views
After LVM/DRBD resize df is reporting incorrect information
I have a Debian Xen DomU which has a DRBD mounted partition. I needed to resize this partition from 46G to 50G. I did the following:
Stopped DRBD on the secondary node: /etc/init.d/drbd stop
...
7
votes
1answer
1k views
How to monitor / control file IO in Xen virtual machines
I have a pretty beefy Xen server (8 CPUs, 4G of RAM) running about 40 256M VPSs and I've been having issues with file IO speed. What I've found is one or two VPSs on the host can severely degrade ...
6
votes
5answers
5k views
How to fine-tune our MySQL server?
MySQL is not my thing, yet I need to fine-tune one of our servers.
Here are the requirements/specs:
The MySQL server has only one
significant database
We only have one "type" of application ...
6
votes
3answers
926 views
Backing up Xen domains
I'm currently developing a Xen backup system, however I have met the following problem:
I have two methods of backing up:
doing dd from the LVM snapshot, and tarring it., and rsync it remotely
...
6
votes
4answers
6k views
Xen DomU root filesystems becoming read-only on iSCSI virtual IP failover
My Xen servers are openSUSE 11.1 with open-iscsi to our iSCSI SAN cluster. The SAN modules are in an IP failover group behind a virtual IP that the initiators connect to.
In the event that the ...
6
votes
1answer
2k views
Xen 4.1 host (dom0) with blktap disks (“tap:aio:”) not connecting
Problem using blktap with xen-4.1 running Ubuntu Precise stock kernel with dom0 xen-4.1.
I get:
[ 5.580106] XENBUS: Waiting for devices to initialise: 295s...290s.
...
[ 300.580288] XENBUS: ...
6
votes
4answers
776 views
Alternatives to Xen for virtualization setup
I currently use Xen in production to run a number of Ubuntu VMs (Intrepid/Jaunty). I've got another server which I'd like to set up as a VM host to run more guest OSes, and am looking for the best ...
6
votes
2answers
4k views
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 ...
6
votes
2answers
1k 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, ...
5
votes
3answers
14k views
Xen vs. VirtualBox under heavy load?
Which performs better under heavy CPU and memory usage on the virtual servers, Xen or VirtualBox?
5
votes
6answers
2k views
What is the perfect setup for a small Linux virtual server?
I have my own email server, and it serves a couple of dozen users. I need to replace it right now, and I want the replacement to be a virtual server image running under a hypervisor.
My plans for ...
5
votes
4answers
242 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 ...
5
votes
7answers
1k views
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 ...
5
votes
3answers
1k views
Xen alternative for VMware Infrastructure
Is there any Xen alternative for VMware Infrastructure?
Any aggregation and control interfaces?
5
votes
2answers
2k views
use LXC under heavier virtualization (Xen, KVM,Hyper-V,VMVare)
Is it possible to use LXC under heavier virtualization (Xen DomU,KVM,Hyper-V,VMVare) ? I would like to use it as security (isolation) tool, the ability to limit resource consumption is not priority ...
5
votes
3answers
1k views
Xen connect to dom0 with vnc?
Is there are a way to connect to dom0 using VNC without running X? I don't want an X server, I just want to see what is on the console.
EDIT: Adding some background, since people seem to be really ...
5
votes
2answers
1k 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 ...
5
votes
2answers
676 views
KVM to Xen migration
I've recently been appointed to create some VMs for production use, and went gung ho into making a KVM based VM instead of finding out what our production server uses.
I've only recently found out ...
4
votes
5answers
2k views
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 ...
4
votes
6answers
725 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 ...
4
votes
2answers
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 ...
4
votes
7answers
1k views
Deploy Xen
I would like to deploy Xen virtualization, however I definately not sure which way to go.
Citrix Xen Server has (AFAIK) better managment tools, but does not provide software raid.
Ubuntu / CentOS ...
4
votes
5answers
2k views
How to find dom0 name from hosted domU
I'm actually testing RHEL 5.3 with Xen between two servers in order to have a disaster recovery solution. So I'm playing with moving my domU from one dom0 server to the other server.
Unfortunatly ...
4
votes
3answers
2k 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 ...
4
votes
3answers
1k views
server virtualization: hypervisor (xen) or virtualbox?
Hey guys!
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 ...
4
votes
1answer
294 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 ...
4
votes
1answer
68 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 ...
4
votes
1answer
254 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 ...
4
votes
2answers
1k 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) ...
4
votes
1answer
116 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 ...
4
votes
1answer
506 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 ...
4
votes
2answers
993 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 ...
4
votes
3answers
2k 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 ...
4
votes
2answers
2k views
Debian/OVH: How to configure multiple Failover IP on the same Xen (Debian) Virtual Machine?
I have a problem on a Xen virtual machine (running latest Debian), when I try to configure a second failover IP address. OVH reports that my IP is misconfigured and they complaint they receive a ...
4
votes
1answer
237 views
High load on Xen guests
We're facing a weird issue with a freshly installed Xen (4.2) system.
The server is an Intel SR1690WB equipped with 4x1Tb HDD and with a RS2BL040 RAID card which configured to use RAID10.
The ...
4
votes
2answers
956 views
Advice on most fitting choice of virtualization platform: Xen | OpenVZ | KVM | other? What suits the purpose best?
I am aware of the multitude of virtualization threads here but they all seem to be oldish and i'd like to have a brand new one ready for 2012.
I'm currently evaluating Xen, OpenVZ and KVM for ...
