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1612 discussions

OpenStack on CentOS
by Karanbir Singh 16 Apr '13

16 Apr '13

Hi, For those that missed this : http://openstack.redhat.com/ targets CentOS directly; Regards -- Karanbir Singh +44-207-0999389 | http://www.karan.org/ | twitter.com/kbsingh GnuPG Key : http://www.karan.org/publickey.asc

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Timer/ISR1 errors have returned in kernel-xen-2.6.18-348.3.1.el5
by David Young 10 Apr '13

10 Apr '13

Hi all, We recently upgrade from CentOS 5.8 to CentOS 5.9 on kernel-xen-2.6.18-348.3.1.el5, and after booting into the new kernel, noted large amounts of these messages every second or so in the logs: Mar 30 21:38:35 atlas2 kernel: Warning Timer ISR/0: Time went backwards: delta=-1393683849 delta_cpu=22316151 shadow=225003685197135 off=129240997 processed=225005208029053 cpu_processed=225003792029053 On both the dom0 and the domUs. Some reading indicates that this _was_ a fault fixed in 2009/2010, but it seems to have resurfaced on the latest kernel. For now, we've reverted back to an earlier kernel. Has anybody else seen this recently, or got any insight? Thanks, David

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Re: [CentOS-virt] [CentOS] qemu-kvm high cpu usage with idle windows guest
by Banyan He 07 Apr '13

07 Apr '13

Maybe you can print out what it is doing, then try to figure out if they are doing good. My linux works good, never tried windows. ------------ Banyan He Blog: http://www.rootong.com Email: banyan(a)rootong.com On 4/7/2013 10:21 PM, Micky wrote: > Windows 2k8 R2 guest with updated virtio drivers is idle inside but on > the host qemu-kvm process uses 7-15% cpu. > > Things that have been tried without any significant success > - removed tablet device > - manually set cpu topology for cores per socket > > Is it just me or the qemu-kvm has little tolerance with windows? > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos >

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Can I have more than 1 bridge attached to a KVM
by Meir Hazon 02 Apr '13

02 Apr '13

Hello Everybody, I have a physical machine with 4 Ethernet cards that I have mapped to 4 bridges. I would like to have each of my KVMs use 2 bridges for NIC bonding. 1. Can I have more than one bridge assign to one KVM? 2. Can I use virt-install to assign a KVM with more than one bridge during the KVM installation? a. It was a long shot but I have tried bridge=br0,br1 ; bridge=br0 bridge=br1 - never worked..... Thanks so much, Meir

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GFS2 hangs after one node going down
by Maurizio Giungato 25 Mar '13

25 Mar '13

Hi guys, my goal is to create a reliable virtualization environment using CentOS 6.4 and KVM, I've three nodes and a clustered GFS2. The enviroment is up and working, but I'm worry for the reliability, if I turn the network interface down on one node to simulate a crash (for example on the node "node6.blade"): 1) GFS2 hangs (processes go in D state) until node6.blade get fenced 2) not only node6.blade get fenced, but also node5.blade! Help me to save my last neurons! Thanks Maurizio

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Problems with qemu img disks allocated in a nfs share
by carlopmart 18 Mar '13

18 Mar '13

Hi all, I have a strange problem with qemu img disks allocated in a nfs share on a CentOS 6.4 host. Every time when I try to start a vm this error appears: char device redirected to /dev/pts/1 qemu-kvm: -drive file=/data/vmachines/win2k12adsrv/win2k12vol01.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: could not open disk image /data/vmachines/win2k12adsrv/win2k12vol01.img: Permission denied Obviously, qemu disk exists: [root@c64kvm qemu]# ls -la /data/vmachines/win2k12adsrv/win2k12vol01.img -rw-r--r-- 1 root root 262144 Mar 16 16:11 /data/vmachines/win2k12adsrv/win2k12vol01.img If I change this qemu disk stored in a nfs share by another stored on local disk, all works ok. Mount permissions in this kvm host: sansrv:/ on /exports type nfs4 (rw,rsize=32768,wsize=32768,hard,intr,addr=172.25.60.1,clientaddr=172.25.60.2) and selinux is disabled ... Any idea?? -- CL Martinez carlopmart {at} gmail {d0t} com

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Windows 2012 as a kvm guest
by C. L. Martinez 11 Mar '13

11 Mar '13

Hi all, Has anyone tried it? Virtio drivers works? Any problems or tips?? My idea is to use centos 6.3 as host, at first step until I can test centos 6.4 Thanks.

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Sanlock disk leases on drbd/gfs2 volume
by Russell Jones 09 Mar '13

09 Mar '13

Hi all, I have a 2 node cluster that consists of the following: * 1 drbd/gfs2 partition that holds VM images and XML * Sanlock configured with the disk lease directory on the same drbd/gfs partition Everything is working well, aside from one small issue I ran into. When testing fencing, on one particular test GFS began replaying the journal for the remaining node, and in the middle of it rgmanager attempted to recover the VM. Normally this wouldn't be an issue, as libvirt would just pause until GFS was ready, however since it's talking to sanlock first, sanlock attempted to acquire the lock, while GFS was not ready, and failed. This caused the recovery itself to fail. I'm attempting to keep the lease directory on the shared storage so that I do not have introduce another single point of failure in the cluster by having an outside NFS mount. It seems like I could get around this particular scenario by changing the recovery policy to "restart" (it's on relocate right now), and have it try restarts several times before giving up, but I wanted to see first if you guys had any advice for this issue as well. Perhaps I'm missing a setting that would correct this? Thanks!

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Re: [CentOS-virt] convert xen to kvm
by Peter Mumenthaler 08 Mar '13

08 Mar '13

hi, yes it is possible. use the tool virt-v2v.... cheers peter mattias <mj(a)mjw.se> wrote: >_______________________________________________ >CentOS-virt mailing list >CentOS-virt(a)centos.org >http://lists.centos.org/mailman/listinfo/centos-virt

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convert xen to kvm
by mattias 08 Mar '13

08 Mar '13

i have a xen instance on a lvm partition are it possible to convert it to kvm image? and if so how?

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