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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How would I know if I should I be disabling virtual NUMA on VMs running older applications?

From VMware's docs: Virtual NUMA topology is available to hardware version 8 virtual machines and is enabled by default when the number of virtual CPUs is greater than eight. You can also ...
4
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62 views

How can I provide services to an internal air-gapped extranet

Background - "Extranet" We have about a dozen users that are on what I would call an Extranet. It is an air-gapped LAN that is physically in the same location as our primary LAN. We share the ...
4
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9k views

How to stop/kill a virtual machine that hangs in “Stopping” state?

I have a virtual machine that constantly hangs in the “Stopping” state. I’ve red several posts suggesting killing the vmwp.exe process of the machine but I’ve never been able to kill this process ...
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50 views

how to configuring secondary IP subnet that is directly routed to WMware ESXI main IP

I have a ESXI 5.1 which comes with a /29 Block IP (EX. 70.60.50.0/29) and the ESXi management address is frist usable addres 70.60.50.2, also i have a secondary /27 IP block (10.20.30.0/27) which is ...
2
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24 views

Rebuilding VHD RAID array

We have a Dell PowerEdge R420 with a PERC H710 mini RAID controller card. The server has six physical disks split over two arrays; one RAID-1 array for the OS and one RAID-10 array for the data. This ...
2
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0answers
15 views

Why is an unassigned adapter showing up in vSwitch “Teaming and failover” order?

On two out of three ESXi 6 hosts there is an unused adapter showing up in the Teaming and failover section of a vSwitch even though that adapter is not assigned to the vSwitch (see screenshots below). ...
2
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0answers
30 views

Allowing outbound internet access with NSX while maintaining micro segmentation

I am getting into the world of VMware's NSX product for the purpose of micro segmenting VM's in the datacenter. That is to say, living in the same network space but not being able to talk to one ...
2
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18 views

Transparently farm processes out to cluster

Situation: At work, we have an in-house tool for data crunching. When a job is triggered, it starts multiple copies of itself in separate processes and communicates with them in order to crunch in ...
2
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72 views

Best practice for configureing vmware dv uplink port groups?

I'm creating a distributed virtual switch - each host has 2 physical NIC's each of which will map to an uplink port. I want to create uplink port groups so i can set up NIC teaming, I wanted to know ...
2
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71 views

Image build system that derives from a base Windows 8.1 image

For our VDI deployment, we have several Windows 8.1 images for target groups that require different suites of applications. The current update procedure requires us to update the OS on each ...
2
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172 views

Debian does not shut down interface with ip link set … down

I have a really specific question for a trunk-testing environment. I have this network setup: +------------+ +------------+ | | +-----+ | | | eth0 +----...
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649 views

TCP Connection Issue Between Linux Machine and VMWare Windows Server

I have a TCP connection issue as follows. The setup: VMWare Virtual Machine: Windows Server 2008 R2 DataCenter SP1, IP: 192.168.2.111, DG: 192.168.2.254 Host Machine: Windows 7 Professional SP1, IP: ...
2
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424 views

How do I get IPv6 packets to my KVM virtual machine?

My setup is: Debian Wheezy x64 on the host and on the guest. I am using a tun/tap setup to connect a virtual machine to the host. The KVM network options I use are: -net nic,macaddr=DE:AD:BE:EF:1A:...
2
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0answers
44 views

Can I convert a physical non-bootable sata volume to a VHD image for mounting in a VM as 2nd volume?

I'm converting physical machines in the office to virtual machines using Disk2vhd, and it doesn't list the second physical hard drive that is in one of the physical machines. Does that mean I cannot ...
2
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2k views

Hypervisor The operation cannot be performed while the object is in it's current state

I attempted to reboot one of my VMs in the Hyper-V Manager. It's a Centos VM and all of my other centos machines are behaving as they should although I can't get this particular one to boot. I'm a ...
2
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489 views

Virtual Machine IP address type changed from static to dynamic

I am testing VMM in a lab environment, I have one VM host machine with one physical network adapter that has been allocated an IP address in the 192.168.1.0/24 subnet on a router. I have create ...
2
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772 views

How to increase CPU core speed of a guest to maximum of Citrix Xenserver Host

There is a Citrix XenServer 5.5 (HP ML370 G5, Xeon 2GHz) on this Server there is a Windows Guest (Windows 2008 R2 x64) under Properties I set 4 CPU Cores with max prio. But if I check with CPU-Z the ...
2
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342 views

Сan I use IOMMU for VT-d to give each virtual machine one at a time GPU?

If I use VMWare with 4 virtual-machines and 4 GPUs (nVidia Quadro/Tesla), then can I give (move) some devices to different virtual-machines for each by a single card? If I have one of these CPU, then ...
2
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0answers
220 views

Recompose a VMware vSphere machine without personal application data loss?

Our organization has converted a large percentage of our employees to VDI. Our logic is that we create a master image for each linked-clone pool, dedicate each linked-clone pool to specific purposes (...
2
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0answers
982 views

How to config libvirt network setting about disabling dnsmasq “except-interface=lo”?

Here is the thing. My VMs run with libvirt and use default network libvirt-provide, and I've mad each VM registers its hostname to dnsmasq set by libvirt. so I want to look up its hostname for ...
2
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6k views

VNC faster than Spice for remote access to KVM guest?

Having used RDP before, I'm not exactly thrilled with the performance I am seeing from VNC to my KVM virtual machines. The KVM host is Ubuntu 12.04 server x64. I've read that Spice is faster, and ...
2
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0answers
697 views

Debian Squeeze Preseed Installation “The current kernel doesn't support the Logical Volume Manager. You may need to load the lvm-mod module.”

I'm attempting to install Debian Squeeze via an instalinux.com image pre-seeded with more or less default settings. (Only notable addition is the openssh server, which is a clickable option in the ...
2
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0answers
773 views

Route specific network traffic through vpn in virtualbox guest

I am running OSX with a windows server 2008 guest in Virtualbox. My goal is to route some of the network traffic in the host through the server guest. This is because the win2008 server has a VPN ...
2
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346 views

virtual memory commited

After a server bounce happens, and after around 40-45 days time period, we receive continuous “Committed Virtual Memory” alerts which indicates the usage of swap space in the magnitude of >4GB This ...
2
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232 views

Xen and Turbo Boost

Running the Debian Squeeze default Xen, I am unable to get any of the CPU frequency scaling stuff going. As soon as I revert to the standard kernel I get it. Digging through the internet it seems ...
2
votes
0answers
436 views

How to configure opennebula for allowing a cluster private network to host images with public IPs

I am installing open nebula 3.4.1 for running virtual machines a (kvm based) cluster made of 5 computers: a front-end machine having 2 network interfaces and 4 slaves machines with a single network ...
2
votes
0answers
189 views

Performance Implications of running multiple Virtual Servers using one base virtual disk?

I tried looking through old questions, but couldn't find one that hit this exact question. In VmWare's documentation on Snapshots, they mention utilizing them for a "process tree" setup. This would ...
2
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0answers
80 views

Exchange Failover causes .ost issues - hownto avoid

Using virtual machine for running exchange and backing it up with a mirror virtual machine in case of failure. During testing of failover and fallback We run into an issue when we fail over the local ...
2
votes
0answers
208 views

Deploy multiple applications in Cherokee and distinguish them by port?

I am having an issue on deploying applications with Cherokee web server. The thing is I need to host various Django applications in the same machine and distinguish each one by ports (i.e. app1 in ...
1
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0answers
27 views

How to limit the block usage on a Thin Provisioned VMs ( VMware)

This question is similar to Best practices for thin-provisioning Linux servers (on VMware) However my question is a touch different. We have P2Ved quite a few servers (win/linux) and we needed to ...
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0answers
56 views

Export or Convert Hyper-V VM to OVA/OVF

I can't find (Google) any documentation on how to export or convert hyper-v VMs to OVA or OVF. The hyper-visor is Windows Server 2012 R2 Standard. The results from Google only point to System Center ...
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25 views

What is the network connection speed between two containers communicating via a virtual bridge running on the same host?

Does a virtual bridge (added to /etc/network/interfaces) limit the transfer speed of data from the memory of one lxc/docker container to another? For example does the memory throughput drop to that ...
1
vote
0answers
50 views

Can't use unallocated space on a Win 2k8 R2 VM

I'm hoping someone can help me with this because after 2 days of googling I've come up with nothing. I have a file server that I have converted from a physical to a virtual on an ESXi 6 host. I have ...
1
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0answers
34 views

What's the impact of a high cpu steal time on XenServer's dom0?

From what I understand, cpu steal time is the CPU time that the VM kernel requested, but was denied by the hypervisor because it was serving another VM. From my experience, on a XenServer that has ...
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0answers
189 views

Export OVF fails with “File not found” error

Good morning/afternoon/evening all: I am having an issue with a single Virtual machine when it comes to exporting an OVA/OVF. I recieve a "File not found" error that appears to be pointing in the ...
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0answers
30 views

How to use virtual interface as default interface

I've got a cloud SSD VPS @ OVH, and I'd like to change the default interface used for requests. I have two interfaces: eth0 (which is the default interface) and eth0:0 (which is the new virtual ...
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0answers
31 views

iperf actual send rate always lower than the expected target bandwidth until some equilibrium reached. Why?

I did an UDP iperf 2.0.5-Ubuntu test between two VMs on the same hypervisor. As can be seen in the iperf output below I started my first test with "-b 686M" flag. However, iperf reported that it was ...
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0answers
101 views

Libvirt & USB Hub Passthrough

I have a virtual machine which I wish to have a USB Hub and all of its devices allocated to a virtual machine. The Hub in question is a USB hub which itself is plugged into one of the ports on the ...
1
vote
0answers
158 views

Java application is slow in virtual server (KVM)

I have a Java web application, which runs from JAR, starts embedded Tomcat and is using Spring Boot. Problem is that it runs very slow when running in KVM virtual guest. The same application in the ...
1
vote
0answers
48 views

How does Qemu handle memory?

I'm having a real hard time understanding something and I was wondering if anybody has any experience with this and is able to help. I have two KVM VMHosts, one running qemu 2.4.1 and the other ...
1
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0answers
148 views

KVM bad IO sync performance in Linux guest

I'm setting up virtualized Ubuntu 15.10 guest inside Ubuntu 15.04 server using libvirt and KVM. Storage in host system: # mount | grep ext4 /dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro,...
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0answers
46 views

Efficiently managing multiple Windows 7 VMs

I will be running several (at least 10, probably more) Windows 7 virtual machines on a Linux server and I am looking for a way to manage this efficiently. All the machines will be identical except for ...
1
vote
0answers
16 views

How can I tell which customization specification has been applied to a deployed VMware VM?

I have inherited a load of virtual machines deployed from templates in VMware. Is there a way that I can tell which customization specification was applied to them during the process?
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0answers
40 views

Virtualizing some domain controllers in a forest

our company has an AD forest made up of a root domain (domain ROOT) and two child domains (SUB1 and SUB2). The ROOT domain contains 2 DC's. SUB1 has 4 DC's and SUB2 has 3 DC's. Currently all the DC's ...
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134 views

Cant connect to server in Hyper-V Manager

I'm trying to connect to my server (running Hyper-V Core) with Hyper-V Manager in windows 10 and it will not connect, putting out the error: You do not have the required permission to complete ...
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72 views

ESXi 5.5: more than one hour to power up a Win2K VM

Around one year ago I installed an ESXi 5.5 to virtualize an old physical Windows 2000 server that, unfortunately, cannot be easily upgraded/migrated/replaced. Main ESXi datastore was created on top ...
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0answers
49 views

Hyper-V Replication Failures

I have 2 sites with failover clusters running Hyper-V 2012. When I started this job the production website (site A) was on Server 2008 running Coldfusion 9, SQL 2008 all on one machine. I upgraded ...
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0answers
83 views

Hyper-v virtual machine acting as two separate vm's

I have a Hyper-V virtual machine (vm1) that has two separate instances of itself. I can log into what should be the same VM (vm1) through Hyper-v and RDP (Remote Desktop Connection) with the same ip ...
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0answers
97 views

Datastores Occasionally Disappear on vSphere Client

I'm currently running several virtual servers and connecting to the vCenter using the vSphere Windows client. We're connecting with to a datastore on another server which has a separate folder for ...
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0answers
158 views

Autostart VM on Witsbits (ClearVM) Server

I am setting up few VMs on my Witsbits (ClearVM) server. They are easy to setup and manage but... I would like to start VM together with the server. The management interface allows for manual ...