Re: [CentOS-virt] domU reboot leaves VM crashing continually
Hi Everyone, I installed a fully virtualized VM on my system noted below. To keep it simple I made it puppy linux. It runs as expected, including successful reboots. So it appears that reboots are broken on my system for paravirtualized systems. I seem to recall the test install of windows I did about a month ago seemed to work also as it was likewise fully virtualized. Any ideas? Thanks! Robert Moser From: centos-virt-boun...@centos.org [mailto:centos-virt-boun...@centos.org] On Behalf Of Robert E. Moser Sent: Saturday, August 29, 2009 5:05 PM To: centos-virt@centos.org Subject: [CentOS-virt] domU reboot leaves VM crashing continually Greetings, Im new to xen virtualization on CentOS, but I have been unable to find the answer to this problem Im experiencing. My setup: AMD quad core (64bit), 8Gb ram. CentOS 5.3 dom0, CentOS 5.3 domUs (paravirtualized). Dom0 is set up with two NICs, the built-in and a PCI card, and I set up xen bridging on both interfaces. My domUs seem to boot up fine, run fine, and shutdown fine. However, if I attempt a reboot operation, they go into a state where they continually crash on startup. I have been unable to ascertain why this happens, and I do not know how to fix it when it does happen. So, my question is twofold: 1) How do I get it out of the continual boot/crash cycle? Xm destroy doesnt work, none of the GUI tools work. So far the only answer has been rebooting dom0, which is not a good answer L 2) Has anyone else seen this/solved this? Besides being able to manually fix it from #1 above, it sure would be nice to have it able to reboot as expected. I havent worked with any fully virtualized guests yet, but I will try that pretty soon and see if it evidences the same behavior. Uname a è Linux prathis.localdomain 2.6.18-128.7.1.el5xen #1 SMP Mon Aug 24 09:14:33 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux Please let me know what additional information would be helpful or what I can do to facilitate debugging this issue. Thanks! ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] Migrate windows VM from i386 Host to x86_64 host
Hi, sounds strange. Basically a dd should be enough to clone the machine. I guess the hardware-model that gets through to the Windows-VM changes when the Kernel-Achitecture changes. So basically you swapped a 32-bit mainboard with a 64-bit mainboard - as far as VM is concerned. So I guess you have to reapair your Windows with some kind of Windows-rescue-mode. Which Windows is it? With XP I had some success with booting from an install-media and then going to repair existing after the install-process has detected the already installed partition. Afterwards all XP-patches had to be re-applied - though. But all installed applications were still there. You'd better try that procedure with cloned data... Kind regards Nils -Original Message- From: centos-virt-boun...@centos.org [mailto:centos-virt-boun...@centos.org] On Behalf Of James Roman Sent: Thursday, July 30, 2009 3:24 PM To: Discussion about the virtualization on CentOS Subject: [CentOS-virt] Migrate windows VM from i386 Host to x86_64 host Somehow one of our Xen servers ended up loaded with the i686 xen kernel, instead of the x86_64. The host has one windows VM running on it. The OS partition is file-based, but it also has a logical volume partition assigned for data. We would like to migrate the host server to a 64-bit kernel, which means moving the VM to one of our other 64-bit host servers. We tried simply copying the OS partition and using dd to move the LVM partition to a new host unsuccessfully. I'm pretty sure that dd may not be appropriate when moving between kernel architectures. However, even without the LVM partition specified in the vm config file, we are unable to boot the windows system. It looks like it is blue screening immediately, since we never get a console connection. Are there any instructions anywhere for moving VMs from one host architecture to another? Current Host: Centos 5.3 i686 kernel 2.6.18-128.2.1.el5 Xen 3.0.3-80.el5_3.3 Destination Host: Centos 5.3 x86_64 kernel 2.6.18-128.2.1.el5 Xen 3.0.3-80.el5_3.3 ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] Cluster failover
Hi, what cluster-software do you use? Heartbeat with v2-syntax can do what you want - using weighted priorities. Kind regards Nils -Original Message- From: centos-virt-boun...@centos.org [mailto:centos-virt-boun...@centos.org] On Behalf Of Paras pradhan Sent: Friday, July 17, 2009 10:15 PM To: linux clustering; Discussion about the virtualization on CentOS Subject: [CentOS-virt] Cluster failover hi, I have 3 nodes of CentOS 5.3 running xen virtual machines as virtual machine service. This cluster is working fine. One thing I would like to know that how to make failover only to third node. What I mean to say is: I have 3 virtual machine running on node 1 and 2 virtual machines running on node 2. Now if node 1 fails I want my the node1 virtual machines to be stared only on node 3 but not on node2. Similary if node2 breaks, I want virtual machines to be started on node3 but never on node 1. Thanks ! Paras. ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] High CPU usage when running a CentOS guest inVirtualBox
On Tue, Sep 1, 2009 at 5:33 AM, Hildebrand, Nils, 232nils.hildebr...@bamf.bund.de wrote: Hi, I just closed a service-request with sun. Topic: Why is Win32 slower running with two CPUs under VBox 3 than running with one CPU on VBox 2? I am running VBox on CentOS 5 64 bit (AMD Athlon Dual Core). The problem is - according to sun - the IO-APIC-emulation: On 32-bit-systems this io-apic-emulation (needed for passing interrupts between CPUs) has to use a full software-context-switching - making things slow. I tried recreating the problem with CentOS 5 64 Bit as VM, two CPUs: no problem With CentOS 5 32 Bit as VM: same problem. I guess some problems with multi-cpu-VMs using 32-bit-operating-systems on a 64-bit hardware are related to this - no matter if you are using xen (fully virtualized), VirtualBox or VMWare. Interesting. I do not have any 32-bit multi-cpu VMs myself, but I do have access to such guests running on a host (64-bit) using kvm. Both CentOS-5 32-bit VM and CentOS-4 32-bit VM show normal load (near 100% idle on all cpus). They have the divider=10 option by the way. Akemi ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
