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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5
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3answers
104 views

Converting VMware VMs to Hyper-V

Our company is looking to try out Hyper-V as a server virtualization solution so I am looking for the most efficient way to test everything out safely. My plan is to make a snapshot backup of each of ...
0
votes
0answers
29 views

Can't Create Win 7 VM with RHEL 6.5 VMM

I have a server running RHEL 6.5 that I primarily run VMs on it. The VMs I run on it are all Linux, with the exception of one that runs Server 2008 R2. Yesterday, I attempted to install Windows 7 as ...
1
vote
2answers
82 views

ESXi Hypervisor - Cannot get multiple VMs to connect to Internet

Pulling my hair for past few days over this. Can some VMWare ESXi expert help out? I recently decided to give ESXi 5.5 a try. Installed it, got connected through vSphere client, and created few ...
0
votes
1answer
56 views

Openstack: Starting multiple shutoff intances

I am using Openstack Icehouse running on Ubuntu. After rebooting Compute node all instances that were running there will be in shutoff state. Is there way to restart them all at once? Only thing I ...
7
votes
1answer
106 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, ...
0
votes
0answers
15 views

ssh server stops on ESXi 5.5 for no reason

I have a ESXi host that I have never been able to access via ssh. I have tried every tutorial I can find on enabling ssh via the command line and the vSphere client to no avail. I enable the ssh, ...
3
votes
2answers
79 views

How To Monitor And Alert For KVM Hypervisors

We have an environment where we are currently monitoring ~50 VM hosts running esxi. We easily get alerts for hardware events and exceeding performance thresholds via vcenter. We're planning on ...
0
votes
1answer
43 views

why linux bridge shows 2 mac addresses for one qemu vm?

I am new to qemu networking and pretty confused about the following situation. I launched 5 VMs. Each connects to br0 through a tap device. I also have a dnsmasq listening on br0 for DHCP. The ...
1
vote
1answer
397 views

How do bridges really work?

I'm in a major confusion here, regarding bridges. I thought that they were devices that allowed going from one network to a different one without routing (doing the work at layer 2 instead), but if ...
3
votes
1answer
57 views

How can I stop Azure from randomly replacing network cards on VMs?

Azure seem to have the habit of randomly changing the hardware configuration of virtual machines, without telling anything to the user. This is of course mentioned in the documentation, although ...
-1
votes
2answers
32 views

VMware licnesing for vdi and server virtualisation [duplicate]

I am planning to virtualise 50 desktops as thin clients(concurrent users). Well i will need 5 servers where 3 will be used for server virtualisation and 2 for desktop virtualsiation.All the servers ...
2
votes
10answers
10k views

bash code in rc.local not executing after bootup

Does anyone know why a system would not execute the script code within rc.local on bootup? I have a post configuration bash script that I want to run after the initial install of VMware ESX (Red ...
0
votes
1answer
38 views

Perfomance of SQL Server on Hyper-V VM

I decided to try server virtualization and I have not had such an experience before. I installed Hyper-V Core 2012, created a virtual machine and installed Windows Server 2008. On this VM I should ...
3
votes
4answers
6k views

Is it possible to span one huge VM across several physical commodity servers?

Is it possible to span one huge Virtual Machine across several physical commodity servers? Here is our use case: We need to implement a 32-processor db server with 64 GB of RAM We don't have a ...
12
votes
2answers
738 views

Is the gang scheduling employed by VMware a serious drawback?

I was reading some technet articles as well as this one regarding the differences between the way VMware and hyper v doing CPU scheduling. I was wondering if I could get some objective info on this. ...
2
votes
1answer
94 views

VMWare: Are long running snapshots really THAT bad?

This is ESXi 5.5. I know that the VMWare KB is very against long running snapshots, however I do not know of another way to do this. Let's say I have a base Linux system and want to spin up a unique ...
3
votes
3answers
712 views

How to find virtualization performance bottlenecks?

We have recently started moving our C++ build server(s) from real machines into VMs. (MS Hyper-V) We have some performance issues that I've currently no idea how to address. We have: Test-Box - ...
0
votes
1answer
64 views

How to benchmark a whole storage infrastructure

I'm a 100% sure that I'm not the first one to consider benchmarking a whole infrastructure, but yet I haven't found any relevant information on how to face this challenge. As I guess we all know what ...
4
votes
2answers
3k views

Running an Active Directory Primary Domain Controller as a virtual machine?

Should the Active Directory PDC always be a physical machine or would it be okay to run it in a VM? What are the implications/trade offs/gotchas? As a corollary to this, what about running a physical ...
1
vote
1answer
44 views

Best practice for VMWare Snapshots for lab VMs

I am setting up test\dev machines in VMWare. We have about six users that I would like to give a VM to. They are all going to be based off a single base image (Ubuntu). I could always create six ...
0
votes
0answers
37 views

OpenQRM installation on Centos - database initialisation runs into timeout

I installed OpenQRM on a fresh CentOS 6.5 from the latest source code as described here: ...
0
votes
1answer
66 views

Any solution for redundancy at the server level for small business?

Back in 2009, we have a solution as follow: Physical Server called Server1 with HyperV and has 1 virtual server - Server3 - running file server, web and application Physical Server called Server2 ...
0
votes
1answer
152 views

Change KVM boot order with multiple virtio disks in guest

I just started playing with KVM, so learning quite a bit here. I have a guest running, finally got the OS setup the way I want with Virtio SCSI and Net drivers (Win2k3) and am very happy with ...
0
votes
0answers
74 views

Guest-VM can only ping CentOS KVM host, cannot access anything else

[root@KVMHOST]# ifconfig br0 Link encap:Ethernet HWaddr 00:1E:67:6B:17:2F inet addr:200.200.100.54 Bcast:220.225.255.255 Mask:255.255.0.0 inet6 addr: fe80::21e:67ff:fe6b:172f/64 ...
0
votes
1answer
144 views

CentOS 7 (Dracut) - Network boot with gateway in different subnet

I'm trying to auto-setup VM guests with CentOS 7 using network boot and kickstart with external network connectivity based on linux bridge. And I'd like to have solution lightweight, simple and ...
0
votes
1answer
123 views

Proxmox VE: Multiple shared public IPs with NAT configuration

I have a Proxmox VE (v3.3 @ Debian 7 Wheezy) and got 3 public IPs routed to that server. It is my aim to have multiple VMs sharing those IPs using a NAT configuration so that I can forward single ...
7
votes
3answers
4k 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 ...
3
votes
2answers
2k views

fully automated install of virtualbox tools in windows 7

I'm making an unattended install of windows. Part of it is installing virtualbox guest additions, which is run by the installer due to the following entry in Autounattend.xml: <?xml version="1.0" ...
0
votes
1answer
27 views

auto assign ip address to httpd.conf

I am building a cluster of servers in which new virtual machines will spin up as resources are needed. Is it possible in the apache config file to use a variable that will detect the servers ip ...
2
votes
1answer
55 views

Placement of OS and SQL files

we are in process of setting up our SQL server which is clustered across 2 HP DL380p servers using a HP P2000 for the shared storage with 2 raid 10 (8 disks) arrays and raid 1 mirror (2 disks). We ...
4
votes
2answers
3k views

How to keep time on resumed KVM guest with libvirt?

On my host I am using libvirt and a KVM guest. When the host is shutting down, libvirt suspends the guest. When the host is starting up, libvirt resumes the guest. The problem is, if the guest is ...
-5
votes
1answer
48 views

Layout for virtualisation of 50 desktops [closed]

We are planning to deploy 50 virtual desktops(for normal users) using thin client hardware and VDI solution(using VMware or Citrix).Currently we have'nt virtualised any of the physical servers.I heard ...
2
votes
1answer
26 views

Migrating existing clustered virtual network to a trunk

We have a 3-host VMWare vSphere v4.1 cluster that has a connection to an untagged network (let's call it 192.168.10.0) using two physical adapters, vmnic1 and vmnic2. Both are currently marked as ...
0
votes
1answer
374 views

How can I change Qemu KVM machine architecture from 440fx to q35 with virsh edit or virt-manager

Still trying to get GPU passthrough working and decided to change machine type from older 440fx to q35 ie pc-q35 but if I do virsh edit on the config it refuse to save saying "PCI Bridges not ...
11
votes
5answers
4k views

How does Virtual Machine snapshotting work?

Having used drive imaging software for over a decade, I find it mind boggling that Virtual Machines can be snapshotted and restored in a matter of seconds, while drive imaging often takes hours. I ...
4
votes
4answers
680 views

vCPU performance between 1 or 2 vCPU's

Within virtualisation (Predominantly VMware) is there a performance advantage using either 1 CPU with 4 cores or 2 CPU's with 2 cores? Let's assume the application running on a VM can use two CPU's.
0
votes
0answers
24 views

Xen memory management

In real machine, I can reserve a certain of memory by editing grub to limit memory,which the machine can use, and then mapping the reserved memory using ioreamp. I can manage these memory and insert ...
1
vote
1answer
3k views

File .vmx not found error when trying to create a VM snapshot after removing an independent volume

I had had a Windows VM having a second virtual drive configured as an independant volume placed on a second datastore on a VMWare ESXi 5 server. Then I have removed the second drive by removing it in ...
0
votes
1answer
290 views

Debian Jessie Qemu KVM GPU Passthrough to Windows Virtual Machine guest Virt-Manager error Bus PCI not found

I'm having problems with Virt-Manager not wanting to boot a VM and giving error: Error starting domain: internal error: process exited while connecting to monitor: char device redirected to ...
0
votes
1answer
25 views

Removing snapshot after removing guest hard disc

I have a server with ESXi 5.5 installed. I recently wanted to add a new hard disk to one of the guests. After adding the virtual disk to it, I took a snapshot just to be sure that nothing would go ...
2
votes
1answer
353 views

When cloning a VMware Virtual Machine, how can I prevent MAC address conflicts?

I've run into the following problem on both VMware Fusion (for Macs) and with VMware ESXi/vSphere. Many of you are familiar with the problem, and it is described at VMware KB: "Networking does not ...
0
votes
0answers
214 views

Convert VHD to use on QEMU KVM

I try to convert a .vhd file (VPC) and get this error. I tried different .vhd files without success. I tried also with a fresh exported VHD with disk2vhd and backup Hyper-V .vhd. qemu-img convert -f ...
0
votes
0answers
22 views

Multicasting on guest Operating System

I have 6 guest Operating Systems (windows server 2008) on a vmware 9.0 My host OS is Windows 8.1, And GNS3 installed on the host OS, where I have my topology with 3 routers configure with multicast ...
0
votes
1answer
208 views

KVM : VMs need several restarts to boot (on 2 different hosts)

I'm using a KVM hypervisor on a Ubuntu Server 12.04 server. My virtual machine's virtual disks are LVM volumes, formatted as ext3. The guest OSes are all Ubuntu 12.04 and 14.04 server. Everything ...
1
vote
1answer
62 views

Is it possible to bridge/join two or more vritual (Hyper-V) switches with the same address range over VPN?

I have several Hyper-V servers which are not in the same LAN. On every server are several Hyper-V guest VMs which are connected via an internal virtual switch. Now I want to to connect these two ...
0
votes
0answers
23 views

Network error when running multiple Virtual Boxes

I have a Ubuntu 14.04 physical desktop that's running some Virtual Box instances (also Ubuntu) through Vagrant. The Virtual Box instances are configured to use static ip and with "natdnshostresolver1" ...
0
votes
1answer
52 views

live migration of a virtual machine to a different machine

I am trying to do live-migration using KVM (libvirt). VM is called host1 and dest. IP address is 10.81.1.9. However, running the following command gives me an error that I am not sure what this ...
0
votes
2answers
283 views

Guest networking not working on Debian Jessie Host server KVM with br0 bridged network

GUESTS networking not working at all. In other words guest can not ping host or lan gateway. I have br0 bridge already created, also brctl show that vnet0 was properly added by KVM to br0 on guest ...
0
votes
1answer
183 views

ESXi550-Update02 missing on host with Dell-ESXi-5.5U2-2068190-A00 Image

I recently deployed a new VMWare ESXi Host with the latest Dell-ESXi-5.5U2-2068190-A00 image. I've just scanned it with Update Manager and it says it has 4 patches available. However 2 of them are ...
12
votes
4answers
14k views

How to zero fill a virtual disk's free space on windows for better compression?

How to zero fill a virtual disk's free space on windows for better compression? I would like a simple open source tool (or at least free) for that. It should probably write an as big as possible file ...