Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where ...

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Xen vs. VirtualBox under heavy load?

Which performs better under heavy CPU and memory usage on the virtual servers, Xen or VirtualBox?
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hardware recommendations for a DIY storage system based on ZFS [closed]

Looking to make use of old server lying idle as a proof-of-concept ...here are specs Dell PE 2900: Xeon 5110 - 2P, 12 GB RAM, 8x 300 GB 15K drives, Perc 5i+256 MB cache what additional h/w would be ...
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Should i go native or with ESXi server?

At this moment, my server is a plain 64-bit amd, running windows 2003. I wanted to run another virtualized OS on top of it using virtualbox. Then I saw that vmware ESXi is free! I always ignored that ...
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14answers
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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) ...
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4answers
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Ganeti vs Proxmox [closed]

I'm system administrator in small software house. I'm going to virtualise our servers. The main reason for doing this is providing highest possible uptime, but probably it will also increase resources ...
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2answers
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Why does increasing logical processors in Hyper-V for virtual machine increase performance.

To my understanding, virtual machines (assuming relative weight is even) get an equal share of the processor. When the VM is given some processing time, it shouldn't matter if the VM is seeing a ...
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3answers
375 views

Is dedicated one NIC to a virtualized DC overkill?

Host Server: Dual Xeon E5530's 24 GB Ram 4x 1GB NIC's (operating at 100MB because of 100MB maanged switch) Server 2008 R2 Enterprise with Hyper-V Role + BackupExec 2012 backing up to NAS ...
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4answers
2k views

Is Hyper-V a real hypervisor

According to Wikipedia, there are Hyper-V and Hyper-V server. Ok... Hyper-V server doesn't need an OS to run, so it is true Hypervisor. But what about Hyper-V inside windows2008, is it a "type 2" ?
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KVM on Illumos (OpenIndiana vs. SmartOS)

I'm considering virtualizing a number of guests onto a single server running a recent port of KVM to Illumos. It sounds like my two primary options will be OpenIndiana and SmartOS. The distribution ...
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7answers
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Why is the time messed up on my Ubuntu Server VPS?

A month back loads of services on my VPS stopped working. After messing about for an hour or so i worked out that the time had frozen. I gather it was some sort of virtualization bug and a reboot soon ...
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6answers
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Best way to “virtualize” existing system?

I have a fully patched, pristine Windows XP box and would like to create virtual machines that have the exact same setup, OS and software - just differ in disk size, available RAM. The virtual ...
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5answers
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FreeBSD jails vs virtualization performance

I'll soon buy myself a nice server (something like the quad-cpu HP DL585) for personal use (home related stuff, data-mining projects, web server and some cron jobs), and I wonder how to separate all ...
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3answers
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What are the advantages of using Hyper-V's synthetic drivers?

We are moving our virtualization platform from Citrix's XenServer to Hyper-V on Windows Server 2008 R2. As part of this project I need to migrate, in one form or another, some Debian Linux servers ...
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2answers
931 views

Linux-KVM networking advice?

Being new to virtualization in general, and somewhat new to Linux (using Debian Squeeze and coming from BSD) I have a hard time understanding what would be the best network bridging option for my host ...
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6answers
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Get list of DHCP clients with KVM+libvirt?

I have several VMs running on Ubuntu 9.10 via KVM+libvirt. I want to be able to find out the IP address that has been assigned to each host without physically opening a physical "console" to each ...
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4answers
523 views

Moving all internal servers to the cloud

Background One of my clients is an IT-dependent workflow-driven law firm with about 50 seats. They have been audited by one of their clients (an FSA regulated mortgage lender) and told that their ...
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1answer
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Can Hyper-V run in a virtual machine?

Ok, we all know (or should know) that Microsoft's answer is a plain "NO!". But we also know that recent hypervisors can support nested/recursive virtualization, provided the underlying CPU offers ...
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1answer
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Does enabling hardware x86 virtualization (AMD-V or Intel VT-x) slow down my computer if I'm not running virtual machines?

Does enabling hardware x86 virtualization (AMD-V or Intel VT-x) slow down my computer? Obviously, it improves the performance if I'm running virtual machines, but what if I'm not running any VMs?
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986 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 ...
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4answers
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Can KVM suspend or shutdown guests automatically on host shutdown?

We have a CentOS 5.5 KVM host, running guests with various versions of CentOS and possibly other OSes later. We'd like to be able to either (a) automatically send an ACPI shutdown to all guests or ...
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5answers
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Is it possible to cause artificial network packet loss or latency?

I'm trying to reproduce some issues on a deployed application where the MSSQL server and client are running in two separate machines. I think there may be network issues between the two machines, so ...
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1answer
258 views

virtual disk image - file or partition

I'm looking at the differences between using a file versus a partition to store a virtual disk image in VM use. The common knowledge is that partition-based images are faster than file-based images ...
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2answers
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How to run an OVA + OVF appliance inside of AWS EC2?

GitHub Enterprise ships as an Open Virtualisation Appliance and File; it's intended to be dropped into existing virtualization setup like VMWare, VirtualBox, etc. I'd like to run it inside of the AWS ...
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PCI-DSS: Virtualization segmentation in ESXi environment

I have already asked this question over on Information Security but so far it has not garnered any comments. I am thinking perhaps it is more of a server infrastructure and configuration question, ...
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2answers
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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 ...
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1answer
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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 ...
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5answers
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Virtualizing Microsoft SQL Database server

My company is looking to virtualize our Microsoft SQL server. I read on another question that databases on VM's suffer from a IO bottleneck which is not very good for us. But I was wondering if ...
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10answers
993 views

Does running one Virtual Machine on a HYPER-V box make sense?

I am considering running HyperV for all my servers, because backup and disaster recovery plans are easier, when I can move the images around to any hardware and not have to worry about drivers. ...
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2answers
1k views

Memory overcommitment on VMware ESXi 5.0

I would like to understand better the possibilities of VmWare ESXi memory overcommitment. I've read this paper from VmWare, so I am familiar with general concepts, such as hypervisor swapping, memory ...
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3answers
9k views

What KVM disk type to use?

I'm setting up a few KVM virtual guests and I'm debating which disk type to use. I haven't been able to find a good resource online that runs down the pros and cons of each. Can you help me create a ...
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5answers
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automatically shutting down an ESXi host nightly

We just picked up a new development server that I've loaded ESXi on. The room it's in is well ventilated during the day but at night the door is closed and it gets quite toasty in there. I've been ...
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3answers
791 views

Is paravirtualization evil?

I have an VMWare ESX Server v3.5 with a few virtualized Debian Lenny VMs (kernel 2.6.22 with vmi) running Apache Tomcat 5.5. I enabled paravirtualization, and Disk IO increased from about 240MB/s to ...
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Is it possible to have a 100% secure virtual private server?

I am curious if it is possible to have a VPS that has data on it that is not readable by the hosting provider, but is still usable on the VPS. Obviously there are some things that you could do to ...
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Can I send clients a pre-configured Virtual Machine?

I am not very well acquainted with VM Ware and Virtualization but I am investigating the feasibility of creating a VM Instance using VMWare, Windows Server 2008 R2, and shipping that VM as a complete ...
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5answers
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LUNs and virtual machines

I have HP P2000 + XenServer solution working. What I'm thinking about is how to create LUNs for 20 virtual machines. Separate LUN for every VM ? It gives me ability to backup the specific virtual ...
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2answers
5k views

Are there any benchmarks for virtual machines with and without VT-x?

Where can I find benchmarks of virtual machines running common OSes like Ubuntu or WinXP, with and without VT-x? I am using xVM (VirtualBox), but also have the option of VMWare or Xen hypervisors. ...
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1answer
355 views

How to take snapshot of non virtual server and restore it in VM?

Is is possible to take a snapshot of a non virtual server (Ubuntu) and restore it in a virtual machine? I'm asking because I'd like to have an exact copy of my production server to use as a dev ...
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4answers
340 views

Is DAS OK for under-utilised virtual machines?

We're a little behind in the virtualization game, I'll have to admit. We currently have nothing virtualized, but I'm trying to change that. We want to get our feet wet with virtualization and get a ...
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5answers
370 views

Fault tolerant server structure for the smallest of businesses

I'm trying to figure out what to do for a small business that has been plagued by ridiculous hardware problems. Right now, this business runs on five or six desktop machines; no server infrastructure ...
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3answers
4k views

Virtual memory in virtualized machines (Swap File in VM?)

What are the opinions on allowing virtual memory inside a virtual machine? For example, a host machine w/8 Gig of memory, I could run 4 VMs each w/2 Gig (roughly) and there would be no host ...
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2answers
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Hardware requirements for a Virtual Server

I moved this question from StackOverflow because it makes more sense to have it here We have decided to go with a virtualization solution for a few of our development servers. I have an idea of what ...
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4answers
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What are the performance implications of running VMs on a ZFS host?

I'm considering migrating from ext3 to ZFS for data storage on my Debian Linux host, using ZFS on Linux. One killer feature of ZFS that I really want is its data integrity guarantees. The ability to ...
6
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1answer
148 views

Installing vmware/xenserver on a linux operating system?

We're currently in the process of setting up a server here in a research environment. It would be ideal to use VMware ESXi, but (and I apologise if I get this completely wrong, I'm somewhat new to ...
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2answers
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VMware: Make applications see Windows VM as bare metal

In a virtual environment using VMware, I want to setup a Windows license server. Unfortunately, the vendor's license server refuses to run on a VM; it must be installed on a physical machine. Since ...
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2answers
466 views

Do you remove unwanted packages (*NIX), or do you disable them?

Im currently building a cobbler and puppet setup. One thing I do is disabling unwanted services with puppet, but then I thought: Should I remove them with cobbler, rather than disabling them after ...
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Virtual host on LAN - VMs on DMZ, separate NICs - is this a bad idea?

Just kicking this idea around, and wanted to see if you'll be so kind as to point out the problems I don't see. If I set up this new HyperV host as a normal domain member, the benefits are obvious. ...
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Guest optimization tips for Ubuntu on VirtualBox [closed]

I was wondering if anyone could shed light into "Guest optimization tips for Ubuntu (guest)" I came across http://serverfault.com/questions/18290/virtual-machine-guest-optimization-tips, for Windows. ...
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2answers
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Running Mac OS X on Hyper-V

I have my workstation setup with a Windows Server 2008 running Hyper-V. Now I really want to install OS X for testing purposes. Have anyone had any success running Mac OS X in an Hyper-V environment? ...
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1answer
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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
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Why doesn't VMWare DRS automatically migrate VMs when a host is put in maintenance mode?

We have 4 ESXi 5.0 hosts in a VMWare cluster on shared storage (NFS) with DRS and HA on. We want to perform a memory upgrade on one of the hosts. We put that host in maintenance mode but DRS did not ...