QEMU stands for "Quick EMUlator" and is a processor emulator that relies on dynamic binary translation to achieve a reasonable speed while being easy to port to new host CPU architectures.
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33 views
KVM copy contents of image into raw smaller LVM2 partition
I have a KVM guest, running on a KVM host...both Gentoo Linux.
The guest is called webserver.img. It is 21 gigs large, but I am only using 5 gigs inside the image.
I want to make a logical volume ...
0
votes
1answer
29 views
KVM how to determine which virtual disk files are in use by VMs
I tried lsof|grep *.qcow2 and got no results back (why is that? I definitely have VMs running using that disk format).
I also considered grepping qcow2 on *.xml within the config directory, but this ...
0
votes
1answer
27 views
Can I boot a CD-ROM on a QEMU guest with a hard drive?
If I insert a CD-ROM into my server's physical CD-ROM drive, can I boot that CD-ROM in a QEMU guest to work on that guest's hard drive? I need to use a Windows 7 repair disk.
This is a continuation ...
0
votes
1answer
38 views
How to setup qemu as a server with different subdomain on a host server?
I am trying to solve a problem, with a Linux server work as host, while qemu guest will have another server intended for subdomain.
I tried to make the host to access the guest server. And I read ...
1
vote
1answer
46 views
aligning partition boundaries of already installed system
I have qemu raw disk which includes two partitions. The second partition is not aligned according to ssd principles. I will move this into Smartcloud environment and they suggest aligning according to ...
0
votes
1answer
84 views
How do I create an ISO image of a partition on an external hard drive?
I see that there is a similar question with the answer to use BartPE with a plugin, but are there any other methods to create an ISO image from an external hard drive partition? I don't feel too good ...
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0answers
138 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 ...
0
votes
1answer
25 views
how do I add a vcpu to one of my KVMs in QEMU?
I want to add a vcpu to a virtual server in QEMU. I tried editing the XML file in /etc/libvirt/qemu and starting the server, but that does not seem to work.
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2answers
101 views
how do I backup my qemu kvm img files that are block files?
I inherited a pair/cluster of Ubuntu 10.04 servers running DRBD and QEMU/KVM and I want to backup the img files but they appear to be block files on the DRBD fs and I'm not sure how I can back them ...
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votes
3answers
169 views
Why is Qemu Virtual CPU on my kvm guests [closed]
can some one please clarify this.
I am new to kvm and created two guest instances one linux and one windows.
On both Guests, CPU is showing as QEMU virtual CPU,why is it so?
if kvm utilizes ...
1
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0answers
164 views
virtualbox to qemu but results in no bootable device qemu
I use vagrant to create my development vm. I exported the vmdk to vdi, and then convert the vdi to img.
cd virtualbox_dir/test_vm
VBoxManage clonehd test_vm.vmdk raw.vdi
0% ..... 100%
qmeu-img ...
0
votes
1answer
190 views
How to start qemu directly in the console (*not* in curses or SDL)
I seem to recall being able to start qemu with only the terminal emulator output, with the graphic window disabled. And here I don't mean with the ncurses interface, that one is nice, but I want the ...
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votes
1answer
153 views
Cannot access Qemu/KVM virtual using console, VNC, or SSH, or access via network (IP range no longer valid) [closed]
I have the host sitting here next to me, so you'd think I'd have decent control of the guest. I should add that I have already attempted various other means, such as mounting the drive, but I have ...
0
votes
2answers
91 views
Can't get beyond boot screen after booting from CD in KVM
I've just installed KVM on Debian 6 64 bit and have created 2 guests and booted one of them.
I can connect via VNC and I get the Debian CD boot options (text/graphical install). I have tried ...
1
vote
1answer
159 views
Setting up bridging for Qemu and routing for OpenVZ (venet) with multiple subnets on Debian Linux
So i've been searching the past couple days trying to figure out the best way to achieve this but still can't get it figured out.
I have a debian server setup running Proxmox to host OpenVZ and Qemu ...
0
votes
1answer
51 views
See processes inside qemu
Sometimes a virtual machine inside kvm/qemu is saturated (load too high). Even a login (ssh) takes several seconds.
But the host is still accessible. How can I investigate why the virtual machine is ...
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0answers
118 views
KVM Nested VMX *Much* Slower Than QEMU Emulation?
I'm experimenting with KVM nested VMX, and the nested VMs are almost unusable with this feature enabled. For example, ttylinux takes ~4 minutes just to boot, compared to ~10 seconds with pure QEMU ...
1
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0answers
115 views
qemu/kvm: connect two machines via ttyS0
I would like to connect two machines via ttyS0
Here's what I did on the guest machines:
A:
Add to /etc/inittab:
S0:2345:respawn:/sbin/mingetty ttyS0
Add to /etc/securetty:
ttyS0
B:
Try to ...
4
votes
1answer
442 views
Filesystem passthrough functionality in Centos 6.2?
I have a CentOS 6.3 machine currently running 2 virtualized CentOS 6.2 machines via KVM/QEMU/Libvirt. I'm trying to setup filesystem passthrough between the guests and the host. However the option is ...
1
vote
3answers
133 views
Opening a Qemu/Xen file based VM Image (won't boot after upgrade)
Apart from one Virtual Host still running Xen/RHEL5, all our virtual capability is hosted on KVM hosts with LVM storage devices. I've stupidly attempted an Ubuntu full release upgrade on a guest ...
5
votes
1answer
495 views
KVM/Qemu, Ubuntu: Why do more guests CPUs enhance Disk-I/O rapidly?
We have an Heartbeat/DRBD/Pacemaker/KVM/Qemu/libvirt cluster consisting of two nodes.
Each node runs Ubuntu 12.04 64 Bit with the following packages/versions:
Kernel 3.2.0-32-generic #51-Ubuntu SMP
...
0
votes
1answer
156 views
Can't get network bridging to work
I'm trying to make network bridging to work on a Debian squeeze (I'm experimenting in order to make a QEMU/KVM virtual machine that will be visible to the outside network as if it were a distinct ...
3
votes
0answers
170 views
QEMU: Solaris 11 / Sparc64 Guest on Linux / X86-64 Host [closed]
I'm trying to run a Solaris 11 / Sparc64 guest on a Linux/x86-64 host. I've cloned the qemu project and configured/compiled it with sparc64 support (./configure --target-list="sparc64-softmmu").
I've ...
2
votes
1answer
85 views
Install Windows with QEMU
I want to understand if it is possible to install Windows from Qemu to a physical HDD.
I was trying to do that by doing something like this:
qemu-system-x64 -m1024 -vnc :1 -hda /dev/sda -cdrom ...
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votes
1answer
117 views
Qemu on Mac instead of VirtualBox [closed]
Assuming I only want to use Linux as guest, are there any advantage in using Qemu instead of VB or other commercial solutions such as VM Fusion?
I want to easy to ro tun Linux on my Mac without too ...
0
votes
2answers
123 views
make vnc server listen on guest's ip address
My host system has the IP 192.168.0.250. Now I want to create a kvm guest using a tap device (so the network card of the guest just acts like a "real" one). The guest has a static ip 192.168.0.249 ...
0
votes
0answers
79 views
Qemu does NOT boot debian squeeze for PPC on x86_64
I've downloaded qemu for ppc and I also downloaded an debian sqeeze image for the ppc from http://people.debian.org/~aurel32/qemu/powerpc/ .
And as per that page, when I try to run the image using :
...
2
votes
1answer
98 views
kvm process has too large a memory footprint on host
I'm using latest ubuntu quantal and start a kvm guest which should have 2048 MB of memory. Now after a few hours I can see that the kvm process of this guest is around 2700 MB, so 700 MB more than the ...
0
votes
1answer
366 views
kvm with virtio scsi and rbd
I'm currently using virtio-blk but I'd like to change to the new virtio-scsi, especially because it supports trim/ discard. The host is an ubuntu quantal system (kernel 3.5.0, qemu 1.2.0).
This is ...
1
vote
1answer
486 views
qemu-img: Could not open $FILE
I received a single-file VMDK from a vendor that has a virtual appliance for a particular product I'm interested in evaluating.
We run a KVM solution (Proxmox) so I tried converting the file but on ...
0
votes
2answers
328 views
KVM/Qemu Guest Shutdown problems
on both host and guest running CentOS 6.3 with KVM/Qemu virtualization, I have the following scenarios:
"virsh shutdown kvm1" did not shutdown at all. virsh lists guest as running.
"service ...
4
votes
2answers
88 views
Accessing the partitions on an LVM volume
Suppose you have an LVM volume /dev/vg0/mylv. You have presented this as a virtual disk to a virtualised or emulated guest system. During installation the guest system sees it as /dev/sda and ...
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votes
1answer
144 views
Is it possible to pass /dev/urandom through from the host to a qemu/kvm guest?
I'd like to pass the host's /dev/urandom device through to a qemu/kvm virtual machine.
Note that /dev/urandom is not seekable, so it's not possible to pass it through as a block device using -hda, ...
0
votes
2answers
696 views
Is there any way to shrink qcow2 image without converting it raw?
Is there any way to shrink qcow2 image without converting it raw?
I cannot convert it to raw because I don't have disk space enough for raw image.
1
vote
1answer
123 views
Is it possible to run Windows as a Xen VM without VT, using Qemu-dm?
Is it possible to run windows as a virtual machine under Xen using qemu-dm? If so, how can it be done?
Since Xen without VT technology supports only para-virtualization, can qemu-dm, the emulator ...
2
votes
1answer
2k views
conversion of a VMDK image with qemu-img failed with “error while reading sector 131072: Invalid argument”
I tried to convert a VMDK image found in a OVA file to the QCOW2 format with the qemu-img command but it failed with the error message qemu-img: error while reading sector 131072: Invalid argument
...
1
vote
2answers
627 views
does KVM raw images support preallocation?
I was trying to create a raw image with this command:
qemu-img create -f raw -o size=200G,preallocation=metadata file.img
but seem that it raw images doesn't support preallocation.
if so why there ...
0
votes
1answer
198 views
KVM low network speed
I have a networking problem with KVM.
There is only one VM on the server and port speed is 100 megabits per second
But maximum download rate is about 1 megabytes per second and expected to be 10mb.
...
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votes
2answers
293 views
Share CPU between two KVM VPS on a dedicated server
how can I share CPU between two KVM VPS on a dedicated server?
assume that we have 8-core CPU on a dedicated server
to get maximum performance for two VPS, should I assign 8 cores to each one of ...
0
votes
0answers
123 views
Corrupt qcow2 image
I seem to have corrupted my qcow2 image. I accidentally ran qemu-img create on one of my virtual machines while running. What seems to have happened is that qemu-img seems to have put a new tag on top ...
0
votes
2answers
356 views
How to create LAN segments in qemu
I could successfully connect two different virtual machine ports directly using LAN segment feature in VMware workstation. Is there a way to do the same on qemu ?
As of now i have created two qemu ...
0
votes
1answer
362 views
CentOS libvirt reboot
I've noticed the following status message after system update (on SL 6.1 - yum update):
# /etc/init.d/libvirtd status
libvirtd dead but pid file exists
one of the updated packages was "libvirt". ...
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votes
1answer
1k views
Libvirt / QEmu Machine Fails and Refuses Restart Because of Memory Allocation Errors
I'm having a problem with libvirt. On a system restart all virtual machines (VMs) are started without a problem and keep running. Then at some point in time a set of machines shuts down according to ...
5
votes
3answers
7k 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
vote
2answers
280 views
QEMU Virtual CPUs
I've seen that people run VMs with KVM and QEMU Virtual CPUs but when I'm creating a VM using virt-manager it only show my real cpu cores not virtual CPUs. how can I activate QEMU Virtual CPU?
Thanks
...
5
votes
2answers
937 views
kvm and qemu host: Is there a limit for max CPUs (Ubuntu 10.04)?
Today we encountered a really strange behaviour on two identical kvm and qemu hosts (Dell R910).
The host systems each have 4 x 10 Cores, which means that 40 physical cores are displayed as 80 within ...
1
vote
3answers
713 views
Is there a way to determine which virtual interface belongs to a virtual machine in a kvm host?
I'm using qemu/kvm whith bridged networking. In the host machine there are several "vnetX" network interfaces without IP. I'm looking for a way to know which vnetX belong to a virtual machine.
I ...
1
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0answers
248 views
qemu/virt-manager no permisson on shared folder
I have a strange problem. Iam trying to create a shared folder via the add-hardware->filesystem option. For Type and Modus i choose Passtrought and for Driver Path. The Source Path is /free and target ...
2
votes
1answer
207 views
How to connect a virtual NIC in one QEMU-KVM instance to a virtual NIC in another QEMU-KVM instance without a bridge
Is there a way to connect a Virtual NIC one QEMU-KVM instance to a Virtual NIC on another QEMU-KVM instance. I want to be able to do this efficiently and it may be possible that the 2 instances could ...
2
votes
1answer
277 views
qemu with tun virtual networking issues
I'm trying to setup a virtual networking environment using open-wrt qemu and vde2
The script to boot two qemu instances and conenct them together is the following
...
