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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Hosting a ZFS server as a virtual guest

I'm still new to ZFS. I've been using Nexenta but I'm thinking of switching to OpenIndiana or Solaris 11 Express. Right now, I'm at a point of considering virtualizing the ZFS server as a guest within ...
32
votes
5answers
10k views

Are VMware ESXi 5 patches cumulative?

This seems basic, but I'm confused about the patching strategy involved with manually updating standalone VMware ESXi hosts. The VMware vSphere blog attempts to explain this, but the actual process is ...
21
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3answers
85k views

How to run VMWare ESX or ESXi in a virtual machine?

Can VMWare ESX or ESXi be installed and used inside a virtual machine? It can be installed inside VMWare Workstation or Server, but then it doesn't work; the main symptoms are: It runs REALLY ...
49
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2answers
4k views

vSphere education - What are the downsides of configuring VMs with *too* much RAM?

VMware memory management seems to be a tricky balancing act. With cluster RAM, Resource Pools, VMware's management techniques (TPS, ballooning, host swapping), in-guest RAM utilization, swapping, ...
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12answers
60k views

VMware Linux Server — how can you tell if you are a vm or real hardware?

An interesting question. I have logged into a Linux (most likely SuSE) host. Is there some way that I can tell programmatically that I am a VM host or not? Also assume that the vmtools are not ...
21
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6answers
6k views

Can windows domain controller be virtualized?

Just the question on the title. There is any problem? Any experience on this?
20
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12answers
33k views

Is it possible to setup a virtual machine inside another virtual machine

I have been playing with virtual machines latley, and wondered if I could run a virtual machine inside a virtual machine? Is it possible? Is it practical?
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3answers
4k 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 ...
27
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12answers
97k views

How do I know if I'm working on a Virtual Machine or not?

Is there a way to know if the Windows machine I'm working on is virtual or physical? (I'm connecting with RDP to the machine. If it's a virtual machine it is working and handled by VMWare).
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2answers
2k views

Enabling hardware virtualisation BIOS; anything to beware?

A lot of recent virtualisation tools can either make use of, or demand, BIOS support (Intel-VT, AMD-V, etc). But in most of the BIOS screens I've seen, it has been disabled by default - sometimes even ...
3
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2answers
5k views

Install windows 2012 R2 over KVM-virtualizaton

I'm trying to install Windows Server 2012 R2 over linux KVM-virtualization. The installation process stops and requires drivers to continue. I'm trying with virtio drivers from fedora but doesn't ...
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3answers
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Do I need to run a NTP server in every VM?

Couldn't the guests somehow inherit the system time of the host ? It seems kind of pointless to run the same daemon to get the same results on the same machine multiple times but I didn't find ...
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1answer
310 views

Assessment & Planning Toolkit

Is there any free tool assessment & planning for Server Consolidation, Performance counters in open source or free to use.
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9answers
133k views

Creating a virtual machine in VirtualBox from a physical one

Is there any way to create a virtual machine that you can use in VirtualBox from a physical installation that you have? For instance, if I have Windows XP installed on a physical computer and want to ...
26
votes
5answers
28k 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 ...
32
votes
8answers
12k views

What is the difference between a cloud server a virtual server and a dedicated server?

What exactly is the difference between a VPS (Virtual Private Server), a Cloud Server, and a Dedicated Server? I'm having trouble finding a concise explanation that isn't littered with advertising.
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8answers
5k views

Consumer (or prosumer) SSD's vs. fast HDD in a server environment

What are the pro's and con's of consumer SSDs vs. fast 10-15k spinning drives in a server environment? We cannot use enterprise SSDs in our case as they are prohibitively expensive. Here's some notes ...
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4answers
7k views

What are the limits of running NTP servers in virtual machines?

I want to set up several Stratum 2 time servers on my local network. Virtual machines would certainly be a cheaper way to do this than buying three 1U servers. What limitations would doing so impose? ...
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2answers
9k views

How to monitor CPU usage and performance on a Hyper-V server with several VM's

I have a server that is running Windows 2008 64 bit Hyper-V, with 8 gigs of RAM and Intel Xeon X3440 @ 2.53 Ghz, which gives me 8 logical cores in the performance monitor on the host system. I have ...
4
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2answers
687 views

HP DL360p with Intel E5-2630 NUMA Capable?

I couldn't find any information via search to determine this via the Intel or HP website. Can you enable NUMA nodes on this? How can you tell the side of each node if so? Is it always best practice to ...
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6answers
3k views

Combine several physical servers into 1 virtual server

The current virtualisation splits one big physical server into smaller virtual servers. But is it possible to combine several physical servers into 1 virtual server ? UPDATE: We have several ...
48
votes
6answers
44k views

What range of MAC addresses can I safely use for my virtual machines?

I want to assign my virtual machines MAC addresses so that I can configure DHCP reservations for them so that they always get the same IP address regardless of which host hypervisor they are running ...
12
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3answers
14k views

Snapshot/rollback for libvirt+KVM?

I've recently begun using KVM for my development/test environment on a Linux host system with 8G memory. Prior, I was using VMware Fusion for my virtual environment, but my Macbook only has 2G memory. ...
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2answers
1k views

Can a virtualized machine have the CPU and RAM resources of multiple underlying physical machines?

We are studying implementing some virtualized servers here, but we don't know what will be better suitable for us. Some folks are saying better have two huge servers, and others are saying have like a ...
8
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2answers
14k views

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 ...
4
votes
1answer
687 views

Is it possible to obtain a copy of Amazon Linux for use outside AWS

How difficult (if at all possible) would it be run a copy of Amazon Linux on a private physical server or hypervisor (Virtualbox/KVM) ? (I am thinking something based in a office/home) I realise it ...
4
votes
5answers
9k views

How to automatically start VM created by virt-manager?

I have created a virtual machine with virt-manager that runs on kvm/qemu. The machine works well when started through virt-manager. However, I would like to be able to start and stop the VM through ...
4
votes
5answers
3k 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 ...
3
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3answers
2k views

Service can't connect to self using public IP, NAT problem

I have a dedicated server from serverloft.eu, but due to some network security I cannot use bridge networking on my server. So I have setup all my IPs to the main eth0, and used NAT to forward trafic ...
5
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1answer
1k views

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

Azure seems 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 ...
2
votes
1answer
12k views

Hyper-V VM doesn't boot off SCSI hard drive

I've converted a VMWare VMDK to a VHDX. The guest is a Windows 8.1 VM. When this is attached to a generation-1 Hyper-V VM as an IDE drive, it boots up fine. When the same VHDX is attached to a ...
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vote
4answers
2k views

How to find out the virtualization type of an linux VPS?

Having access to an VPS, i need to know which type of virtualization it is running from the terminal. How can determine the virtualization platform that my VM is running on? (OpenVZ, Xen, KVM, etc?)
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7answers
1k views

Is our planned backup strategy adequate for my new server insfrastructure?

We're in the process of setting up a new server for migrating the old ones. Basically we'll have a Windows Server (2003 or 2008) running 6+ virtual box servers (Windows and Linux development, ...
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vote
2answers
477 views

ESXi 5.1 crashing

I got a ESXi 5.1 installation which is irregularly crashing with a error output like the following: The server has got the following hardware: Supermicro X8DTN+ Mainboard 2 x Intel XEON E5606 6 x ...
0
votes
3answers
165 views

15 to 20 developers on VM

Is it possible to run 15 to 20 developers (VS2010, and other supporting software) off of 1 VM server and is there any documentation to support this? I don't know if I'm talking about buying a 4 ...
9
votes
8answers
2k views

Virtualization: Guest in guest?

Does it make any sense to run a virtual machine with a "master" guest, and in that master guest run many other guests? Has anyone tested this? Is it even possible? Are there better ways to accomplish ...
7
votes
2answers
3k 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 ...
5
votes
5answers
8k views

Debian Squeeze Hyper-V Drivers

I have a fresh Debian 6.0.0 (Squeeze) server running on Hyper-V and I'm trying to get the synthetic drivers loaded into the kernel (2.6.32-5-amd64). The research I've done says that the Linux ...
4
votes
2answers
31k views

How to export a VMware ESXi 5 VM into a file to restore it later?

As I've bought a server it had a RAID controlleer which was not supported by VMWare ESXi 5, so I had to install it in a bare non-RAID configuration. Now as I've bought a supported RAID controller I am ...
3
votes
2answers
4k views

Can a single Virtual Core on a VM use more then 1 physical core?

I have a server running dual quad core cpu's with hyper threading. We have a Windows 2003 VM and it has a single core. when using prime95 I notice that it tops out at about 2.3Ghz (each Core is 3ghz ...
3
votes
1answer
709 views

Advice for Hyper-v deployment on windows server

We just bought two new servers that have windows server standard 64 bit sp2 on them. Relevant Hardware: Dual Xeon E5430 @ 2.66 16 Gig Ram 6 143 GB 15,000 RPM SAS SCSI on Raid 5 for total of 544GB Hard ...
1
vote
2answers
795 views

SQL Server wont start on my 64-bit virtualization slice

I have installed SQL server 2008 express on a 64-bit virtual box and the service wont start. Looking at the event log I get: Could not create tempdb. You may not have enough disk space ...
1
vote
1answer
10k views

VMWare ESXi 3.5 “Could not power on VM: No space left on device”

We have several VMWare ESXi boxes, and on some we get this message when trying to power on virtuals: "Could not power on VM: No space left on device Failed to power on VM" The Datastore is 67G, we ...
80
votes
4answers
15k 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 ...
54
votes
2answers
42k views

Difference between KVM and QEMU

I have been reading about KVM and Qemu for sometime. As of now I have a clear understanding of what they do. KVM supports hardware virtualization to provide near native performance to the Guest ...
52
votes
7answers
103k views

Top - what does Virtual memory size mean? …linux/ubuntu

I am running top to monitor my server performance and 2 of my java processes show virtual memory of up to 800MB-1GB. Is that a bad thing? What does virtual memory mean? And oh btw, I have swap of ...
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17answers
2k views

Virtualization Pitfalls/Lessons Learned

What are some pitfalls or lessons learned after converting existing hardware to a virtualized environment? Is there anything you tried to virtualize but will never do again?
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5answers
45k views

KVM: Which CPU features make VMs run better?

We are using Ubuntu 12.04 with the following parameters: Dell R910 Kernel 3.2.0-25-generic #40-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux kvm 1:84+dfsg-0ubuntu16+1.0+noroms+0ubuntu13 qemu-kvm 1.0+...
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6answers
3k views

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 ...
9
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2answers
6k views

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 ...