virt January 2012

virt@lists.centos.org

37 participants
24 discussions

Cannot remove lvs associated with deleted vm guests
by James B. Byrne 27 Jan '12

27 Jan '12

At the beginning of January I encountered a problem where several vm guests on a single host somehow managed to see the the virtual disks assigned to other guests on the same hosts. I was unable to resolve this situation and shutdown the affected guests after creating new guest instances and moving the services and data off the corrupted guests. I have since removed these guests via virt-manager but all attempts to remove from the host the logical volumes associated with the former VirtIO disks fail. The volumes are considered open by lvremove and nothing I have tried can get them to close for removal. The --force option has no effect on this situation. # /sbin/lvremove -f /dev/vg_vhost01/lv_vm_base Can't remove open logical volume "lv_vm_base" # dmsetup info -c vg_vhost01-lv_vm_base Name Maj Min Stat Open Targ Event UUID vg_vhost01-lv_vm_base 253 5 L--w 2 1 0 LVM-gXMt00E1RDjpSX3INLZ35Prtg66aX36BeAOlKIkmfSNQRNol3Hni920R4YVaZr52 # dmsetup remove vg_vhost01-lv_vm_base device-mapper: remove ioctl failed: Device or resource busy Command failed There are several bugs filed on similar issues and udev is sometimes identified as the culprit. If I kill the udev daemon with T=`pidof -x udevd`; kill $T and rerun the lvremove -f command then I see this change in behaviour: # /sbin/lvremove -f /dev/vg_vhost01/lv_vm_base Found duplicate PV djM23m6YebBQ2xgPh9ORMtdX2iOu9xBQ: using /dev/mapper/vg_vhost01-lv_vm_pas.harte--lyne.cap2 not /dev/mapper/vg_vhost01-lv_vm_pgsql--dbms.harte--lyne.ca_00p2 Found duplicate PV djM23m6YebBQ2xgPh9ORMtdX2iOu9xBQ: using /dev/mapper/vg_vhost01-lv_vm_basep2 not /dev/mapper/vg_vhost01-lv_vm_pas.harte--lyne.cap2 Can't remove open logical volume "lv_vm_base" I need to get this system stable and return the lost disk space to the storage pool. Does anyone have any suggestions as to how to proceed? If I cannot solve this using the available system commands then prudence dictates that I have to re-install the server OS and rebuild all of the vm guests. As these guests have been laboriously transferred from other hosts during the past month this is a task I would rather not have to do. Any help is gratefully accepted. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS-virt] [CentOS] VirtIO disk 'leakage' across guests?
by James B. Byrne 20 Jan '12

20 Jan '12

On Mon, January 16, 2012 17:01, Dennis Jacobfeuerborn wrote: > On 01/16/2012 10:16 PM, James B. Byrne wrote: > > ... >> The xmldump for this guest instance contains this: > ... > > Please post the xmldumps of the original guest and cloned > guest right after > cloning and without any modifications. > > Regards, > Dennis Prototype dumpxml virsh # dumpxml vm-centos-6 <domain type='kvm' id='34'> <name>vm-centos-6</name> <uuid>77692b36-d424-175f-b991-abc58fa0359b</uuid> <description>vm clone prototype root user password: protoype</description> <memory>2097152</memory> <currentMemory>2097152</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='rhel6.0.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source dev='/dev/vg_vhost01/lv_vm_base'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:28:7e:ce'/> <source bridge='br0'/> <target dev='vnet5'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/6'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/6'> <source path='/dev/pts/6'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='tablet' bus='usb'> <alias name='input0'/> </input> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5905' autoport='yes'/> <sound model='ac97'> <alias name='sound0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </memballoon> </devices> <seclabel type='dynamic' model='selinux' relabel='yes'> <label>system_u:system_r:svirt_t:s0:c299,c322</label> <imagelabel>system_u:object_r:svirt_image_t:s0:c299,c322</imagelabel> </seclabel> </domain> virsh # A substantially identical clone of the prototype. This guest has had no additional storage added to it. virsh # dumpxml sshpipe.harte-lyne.ca <domain type='kvm' id='19'> <name>sshpipe.harte-lyne.ca</name> <uuid>5fbd2bad-059c-da0d-c856-c16cfb831a9a</uuid> <description>vm clone prototype root user password: protoype</description> <memory>2097152</memory> <currentMemory>2097152</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='rhel6.0.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source dev='/dev/vg_vhost01/lv_vm_sshipe.harte-lyne.ca_00'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:ee:d8:32'/> <source bridge='br0'/> <target dev='vnet2'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/3'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/3'> <source path='/dev/pts/3'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='tablet' bus='usb'> <alias name='input0'/> </input> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5902' autoport='yes'/> <sound model='ac97'> <alias name='sound0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </memballoon> </devices> <seclabel type='dynamic' model='selinux' relabel='yes'> <label>system_u:system_r:svirt_t:s0:c876,c1002</label> <imagelabel>system_u:object_r:svirt_image_t:s0:c876,c1002</imagelabel> </seclabel> </domain> virsh # The second guest, sshpipe, shows this for pvdisplay: [root@sshpipe ~]# pvdisplay Couldn't find device with uuid umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De. --- Physical volume --- PV Name /dev/vda2 VG Name vg_vm_centos_6 PV Size 7.32 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 1874 Free PE 0 Allocated PE 1874 PV UUID djM23m-6Yeb-BQ2x-gPh9-ORMt-dX2i-Ou9xBQ --- Physical volume --- PV Name unknown device VG Name vg_vm_centos_6 PV Size 31.25 GiB / not usable 3.97 MiB Allocatable yes PE Size 4.00 MiB Total PE 7999 Free PE 1855 Allocated PE 6144 PV UUID umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De and this for vgdisplay [root@sshpipe ~]# vgdisplay Couldn't find device with uuid umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De. --- Volume group --- VG Name vg_vm_centos_6 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 2 Max PV 0 Cur PV 2 Act PV 1 VG Size 38.57 GiB PE Size 4.00 MiB Total PE 9873 Alloc PE / Size 8018 / 31.32 GiB Free PE / Size 1855 / 7.25 GiB VG UUID qa6jwq-5gTp-6mMH-IWl9-OrEK-HjWc-pbaFsa But, sshpipe should only have a single 8Gb VirtIO disk assigned. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS-virt] (no subject)
by Wendy William 18 Jan '12

18 Jan '12

http://luk-art.com/friend.links.php?usexjgo=26&ywywesok=36

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Re: [CentOS-virt] VirtIO disk 'leakage' across guests?
by James B. Byrne 16 Jan '12

16 Jan '12

If I log on to the newly cloned guest and I try and rename the vg used by that instance I see this: [root@vm-centos-6 ~]# vgrename vg_vm_centos_6 vg_vm_renamed Couldn't find device with uuid umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De. Cannot change VG vg_vm_centos_6 while PVs are missing. Consider vgreduce --removemissing. [root@vm-centos-6 ~]# vgreduce vg_vm_centos_6 --removemissing Couldn't find device with uuid umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De. WARNING: Partial LV lv_pgsql needs to be repaired or removed. WARNING: Partial LV lv_backups needs to be repaired or removed. WARNING: There are still partial LVs in VG vg_vm_centos_6. To remove them unconditionally use: vgreduce --removemissing --force. Proceeding to remove empty missing PVs. The xmldump for this guest instance contains this: <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source dev='/dev/vg_vhost01/lv_vm_test-vg-rename'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> The /dev entries for this vm guest are these: [root@vm-centos-6 ~]# ll /dev/vg_vm_centos_6/* lrwxrwxrwx. 1 root root 7 Jan 16 15:36 /dev/vg_vm_centos_6/lv_root -> ../dm-0 lrwxrwxrwx. 1 root root 7 Jan 16 15:36 /dev/vg_vm_centos_6/lv_swap -> ../dm-1 Searching for the missing uuid I find these files: # find /etc -print | xargs grep 'umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De' /etc/lvm/archive/vg_vm_centos_6_00005-1429183950.vg: id = "umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De" /etc/lvm/archive/vg_vm_centos_6_00002-807578735.vg: id = "umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De" /etc/lvm/archive/vg_vm_centos_6_00004-1687335328.vg: id = "umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De" /etc/lvm/archive/vg_vm_centos_6_00003-650133889.vg: id = "umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De" /etc/lvm/archive/vg_vm_centos_6_00006-1907108135.vg: id = "umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De" /etc/lvm/backup/vg_vm_centos_6: id = "umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De" Looking in the files of /etc/lvm/archive created by the vgrename command shows a complete mess of lvs from different vm guests non of which have anything in common with the test vm guest, other than they all share the same volume group name. Evidently, cloning vm instances for the purpose of setting up a new vm guest to run with other vms cloned from the same prototype is not a good idea, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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VirtIO disk 'leakage' across guests?
by James B. Byrne 16 Jan '12

16 Jan '12

We are in the process of migrating several stand-alone server hosts onto a CentOS-6 kvm virtual host. We also use Webmin to administer our hosts. All of the guests, without exception, have been cloned brom a prototype guest using virt-manager. All of the additional VirtIO disks assigned to some of the guests have been added through virt-manager as well. Recently I have encountered a situation with the development copy of Webmin where I can see an additional VirtIO disk assigned to one guest instance, but not yet added to the lvg of that guest, as an unknown device on different guest. Further, I can see an lv assigned to one guest instance as an lv on a difference guest. The webmin author is aware of this problem and is assiduously trying to determine its cause. My difficulty is answering the question: How is it even possible for an application running under a httpd service on one guest to see anything at all besides the VirtIO storage assigned to that guest? Has anyone else encountered this anomaly? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS-virt] VirtIO disk 'leakage' across guests?
by James B. Byrne 16 Jan '12

16 Jan '12

On Mon, January 16, 2012 13:05, James B. Byrne wrote: > How is it even possible for an > application running under a httpd service on one guest to > see anything at all besides the VirtIO storage assigned to > that guest? > > Has anyone else encountered this anomaly? > I just cloned a guest instance. The clone prototype was set up with a single VirtIO disk of 8Gbs, divided into a 500 Mb boot and a ~7.1Gb root partition. The root partition was entirely assigned to the basic vg and two lv were created, one for swap and one for the actual root partition. When the guest was cloned there was only one VirtIO disk of 8 Gb assigned to it and this was cloned and given a new name. When I look at the newly cloned guest instance with pvdisplay this is what I see: # pvdisplay Couldn't find device with uuid umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De. --- Physical volume --- PV Name /dev/vda2 VG Name vg_vm_centos_6 PV Size 7.32 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 1874 Free PE 0 Allocated PE 1874 PV UUID djM23m-6Yeb-BQ2x-gPh9-ORMt-dX2i-Ou9xBQ --- Physical volume --- PV Name unknown device VG Name vg_vm_centos_6 PV Size 31.25 GiB / not usable 3.97 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 7999 Free PE 0 Allocated PE 7999 PV UUID umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De When I look at it using vgdisplay then this is what I see: # vgdisplay Couldn't find device with uuid umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De. --- Volume group --- VG Name vg_vm_centos_6 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 10 VG Access read/write VG Status resizable MAX LV 0 Cur LV 4 Open LV 2 Max PV 0 Cur PV 2 Act PV 1 VG Size 38.57 GiB PE Size 4.00 MiB Total PE 9873 Alloc PE / Size 9873 / 38.57 GiB Free PE / Size 0 / 0 VG UUID qa6jwq-5gTp-6mMH-IWl9-OrEK-HjWc-pbaFsa What is going on and how do I fix this? The size of the ghost pv (31Gb) is showing up as the size of the clone's vg whereas the pv for the cloned instance is only 8Gb. I am only using virt-manager to manage disk storage for these guests and I have no idea why or how this mismash is happening. Any ideas? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Centos 6.2 / KVM troubles with network
by Radek Bursztynowski 14 Jan '12

14 Jan '12

Hi, I have installed CentOS 6.2 x86_64 and KVM/Qemu and I have some troubles with network. The first case: ----------------- The configuration is: - CentOS 6.2 (hardware machine) has one Ethernet interface with static IP address (eth0). - Virtual machine has bridge network interface with eth0 interface on CentOS 6.2. This bridge is created using wizard integrated with virt-manager. - Bridge interface on virtual machine receives IP addres from DHCP server. IP address is received well. - All firewalls and SELinux are closed. Virtual machine has no any connection with CentOS 6.2 hardware machine, and CentOS 6.2 has no any connection with virtual machine. But every others machines have all connection with both virtual and CentOS 6.2 machine. The question: Why? The second case: ---------------------- The configuration is: - On CentOS 6.2 (hardware machine) I created bridhe (br0) with eth0 hardware interface. Two situations: + I force two different IP addresses for eth0 and br0 interfaces - there no any connection with this server. So I don't test this case. + I forced one IP addres for both eth0 and br0 interfaces. ifconfig shows that eth0 has no IP address, br0 has IP address. So, I test this case. - I use Red Hat documentation: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Vi…) - On virtual machine I created bridge connection with br0 interface on CentOS 6.2. - All machines have all connections. - All firewalls and SELinux are closed. NFS server on CentOS 6.2 (hardware machine) doesn't serve exported file system. The questions: 1. Is it proper that eth0 has no IP addres and bridge (br0) interface has? 2. What about my NFS? NFS server worked well before starting virtualization. Who can me help with my troubles? Regards, Radek

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No module named cygvirtmod
by Lars Hecking 12 Jan '12

12 Jan '12

I'm trying to set up a xen guest on a machine that already has a few others running (not set up by me). It fails with the following error: + virt-install -r 512 -n host5 -f /dev/vol0/lvol5 --nographics -p --os-type=linux --os-variant=rhel5 --accelerate -l http://bla -x ks=http://bla/ks.cfg -m MA:CA:DD:RE:SS Traceback (most recent call last): File "/usr/bin/virt-install", line 31, in ? import libvirt File "/usr/lib64/python2.4/site-packages/libvirt.py", line 12, in ? import cygvirtmod as libvirtmod ImportError: No module named cygvirtmod This is a standard CentOS 5.4 x86_64 install, and I have not been able to find a solution on the web.

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centos 6 domU doesn't see all memory?
by Chris Wik 11 Jan '12

11 Jan '12

I'm running CentOS 6 x86_64 domU on CentOS 5 x86_64 dom0 The host is running 2.6.18-238.19.1.el5xen The guest is 2.6.32-220.2.1.el6.x86_64 'xm list' on the host shows 512mb memory allocated. 'free -m' in the guest shows 224mb memory. 'xm mem-set 21 1024' (21 being the domU ID), 'xm list' now shows 1024mb, but in the guest I now see 736mb. Anyone else seeing this? Any ideas on how to fix it? Chris -- Chris Wik Anu Internet Services Ltd www.cwik.ch | www.anu.net

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KVM VM crash under I/O load (e1000 and virtio)
by Ben Clay 09 Jan '12

09 Jan '12

I'm pretty consistently getting crashed KVM VMs under network I/O load when using the e1000 and virtio NIC models, with the follow message in dmesg: qemu-kvm[8785]: segfault at d0 ip 00000031e3200a08 sp 0000000047784080 error 4 in libnvidia-tls.so.285.05.23[31e3200000+3000] qemu-kvm[8791]: segfault at d0 ip 00000031e3200a08 sp 0000000049f89080 error 4 in libnvidia-tls.so.285.05.23[31e3200000+3000] qemu-kvm[8792]: segfault at d0 ip 00000031e3200a08 sp 000000004a78a080 error 4 in libnvidia-tls.so.285.05.23[31e3200000+3000] [<ffffffff8113b41b>] ? newseg+0xf0/0x213 [<ffffffff8113b32b>] ? newseg+0x0/0x213 These VMs are not performing any tasks with their display that I am aware of, and are not assigned GPUs. I'm aware that this isn't the latest nvidia driver, but I guess I don't understand why it's causing the problem in the first place. The same thing also happens when using the virtio block driver under heavy load. Unfortunately this is forcing me to fall back to the default NIC drivers, which are very slow (~120Mbit/s VM<->VM vs ~460Mbit/s with virtio). We're using vanilla kernel 2.6.32, with the following KVM-related packages: kmod-kvm-83-239.el5.centos kvm-qemu-img-83-239.el5.centos kvm-83-239.el5.centos libvirt-0.8.2-22.el5 Here is an example config (you can see where I commented out the model lines, because the VMs won't stay up): <domain type='kvm'> <name>myvm</name> <memory>8388608</memory> <currentMemory>8388608</currentMemory> <vcpu cpuset="0-7">8</vcpu> <os> <type arch='x86_64' machine='rhel5.4.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' cache='none' type='raw'/> <source file='/vm/path/disk.raw'/>  <target dev='vda'/> </disk> <interface type='bridge'> <mac address='mac1'/> <source bridge='br0'/>  </interface> <interface type='bridge'> <mac address='mac2'/> <source bridge='br9'/>  </interface> <serial type='pty'> <source path='/dev/pts/2'/> <target port='0'/> </serial> <console type='pty' tty='/dev/pts/2'> <source path='/dev/pts/2'/> <target port='0'/> </console>  </devices> </domain> Any help would be appreciated! -Ben

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virt January 2012