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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Disk shrink does not work on ESXi guests

EHLO everyone! My first post on the StackOverflow network :) We're running some ESXi 5.0/vCenter infrastructure to host mainly Debian 6/amd64 guest systems with ext3 partitions and open-vm-tools ...
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4answers
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p2v v2v v2p tool from open source? [closed]

we have centos, fedora, ubuntu server and desktop we are looking for good open source tool for p2v v2v v2p and we are not using vmware here only we use xen or kvm. Same of the server shifted to new ...
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5answers
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Can a Windows 7 Ultimate product key be used for virtual machines as well? [duplicate]

Possible Duplicate: Can you help me with my software licensing question? I have Windows 7 Ultimate running on my computer, and I thought I would set up a few virtual machines to help me ...
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3answers
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Why LXC when there is linux-vserver?

I am no LXC expert, but as far as I know it is really similar to linux-vserver. If that is correct, I wonder why there is another player in the already crowded virtualization camp? What does LXC ...
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4answers
565 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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6answers
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What are the most important aspects to consider when choosing a SAN for a small office virtualization project?

I am in the process of consolidating 6 physical servers running 6 different operating system flavors (don't ask) into two identical physical servers (Dell PowerEdge 2900), using the free VMware ESXi ...
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2answers
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Adding new virtual disks to a RHEL host in ESX “live”

I'm sure I've just missed which tutorial/manual page covers this, but how do you add get the guest OS to recognize that you've added new drives to it without a reboot? I have a RHEL5 guest running on ...
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2answers
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Server CPU's: How much does L3 cache size matter when it comes to virtualization?

Performance-wise, how much does the L3 cache size on Intel Xeon i7 processors matter for virtualization functions? I'm picking out a Xeon 1366 Nehalem/Westmere CPU for a server I'm spec'ing to be a ...
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3answers
349 views

Technology for short-lived private VMs

I'm trying to build a system that will run short-lived (CI and test builds) of software components, it's mandatory according to my requirements that each live on a private host. I'm taking that ...
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3answers
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Virtual Sound Card for Windows Server?

i have some software running on a server which requires a sound card to be installed. i'm trying to find a virtual, or emulated, sound card driver for Windows 2000 Server. It doesn't have to play ...
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6answers
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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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11answers
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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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votes
4answers
4k views

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
9k views

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 ...
7
votes
3answers
405 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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2answers
3k views

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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1answer
637 views

Hardware requirements for 100 virtualized high performance Windows 7 desktops?

We are debating whether to add Client Hyper-V or VMWare Player Pro to new Windows 10 desktops later this year and have our developers run their developer tools in a Windows 7 VM on their local ...
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7answers
3k views

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 ...
7
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6answers
4k views

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
6k views

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
2k views

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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7answers
8k views

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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1answer
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What is the difference between PV and HVM virtualization types in ec2?

AWS EC2 offers two types of virtualization of Ubuntu Linux EC2 machines - PV and HVM. PV: HVM: What is the difference between these types?
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2answers
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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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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? ...
7
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2answers
12k views

Changing boot device for a QEMU-KVM virtual machine

I am trying to change the boot device for a VM. I go to the VM's XML file in /etc/libvirt/qemu and set <boot dev='cdrom' />. Still, it attempts to boot from the harddrive instead of the cdrom. ...
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1answer
2k views

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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4answers
1k 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 ...
7
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4answers
10k views

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 ...
7
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1answer
303 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 ...
7
votes
2answers
9k views

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 ...
7
votes
1answer
463 views

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, ...
7
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1answer
1k views

TCP/IP performance tuning under KVM/Qemu

With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to ...
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2answers
2k 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 ...
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 ...
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6answers
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Are Rackspace's Cloud Servers really cloud hosting?

I may be confused about what cloud hosting really is... I asked Rackspace how its Cloud Server (CS) 256MB/10GB compares to Slicehost's 256slice VPS, and they said it's exactly the same (only ...
6
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5answers
548 views

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 ...
6
votes
7answers
3k views

ESXi VM NTP Server

We need to setup an internal NTP server. Because this server will pretty much ONLY be a time server I was thinking of just creating a VM for it. However, Googling around it appears that there there ...
6
votes
4answers
17k views

Best practice for assigning private IP ranges?

Is it common practice to use certain private IP address ranges for certain purposes? I'm starting to look into setting up virtualization systems and storage servers. Each system has two NICs, one ...
6
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10answers
1k 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. ...
6
votes
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 ...
6
votes
5answers
13k views

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 ...
6
votes
3answers
855 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 ...
6
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2answers
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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. ...
6
votes
5answers
857 views

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 ...
6
votes
5answers
858 views

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 ...
6
votes
1answer
1k views

Linux high RAM usage for unknown reason

after searching around for this and only finding posts of people who do not interpret the "cached" figure correctly, I decided to ask this question. I have some servers at hand, which act strangely. ...