Re: live migration problems.
Thank you very much, this solved my problem, not even 1 ping is lost! I did not find this hint in the documentation though. Really thanks again Riccardo On 3/30/12 11:58 PM, Andrew Cathrow wrote: - Original Message - From: "Riccardo Veraldi" To: kvm@vger.kernel.org Sent: Friday, March 30, 2012 5:45:47 PM Subject: live migration problems. Hello, I have problems with live migration. I have several VMs in a CentOS 6.2 cluster environment. When I migrate one virtual machine from nodeA to nodeB the migration goes smoothly but in the same time the VM is migrated an external ping cannot reach the VM. I ping the VM before migration and after the migration is done ping stops to work. This happens for some VM and does not happen for other VM. Apparently the VM are configured the same way so I can't understand why this is happening. If I migrate the VM back to the original physical node the ping start working again like if the switch did not realize the VM mac address changed switch port. To make things work always I Should make a ping from the VM console to whatever host and in this case the arp table is updated on the switch. The strange thing as I said is that some VM seems to always work after migration while other seems never to work untl they are migrated back to original cluster node. Any hints or suggestions ? Make sure you have DELAY=0 set in the ifcfg file for the bridge on both hosts. thank you very much Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: live migration problems.
ifdown and ifup of the bridge is sufficient to enable the new delay config ? thank you Rick On 3/30/12 11:58 PM, Andrew Cathrow wrote: - Original Message - From: "Riccardo Veraldi" To: kvm@vger.kernel.org Sent: Friday, March 30, 2012 5:45:47 PM Subject: live migration problems. Hello, I have problems with live migration. I have several VMs in a CentOS 6.2 cluster environment. When I migrate one virtual machine from nodeA to nodeB the migration goes smoothly but in the same time the VM is migrated an external ping cannot reach the VM. I ping the VM before migration and after the migration is done ping stops to work. This happens for some VM and does not happen for other VM. Apparently the VM are configured the same way so I can't understand why this is happening. If I migrate the VM back to the original physical node the ping start working again like if the switch did not realize the VM mac address changed switch port. To make things work always I Should make a ping from the VM console to whatever host and in this case the arp table is updated on the switch. The strange thing as I said is that some VM seems to always work after migration while other seems never to work untl they are migrated back to original cluster node. Any hints or suggestions ? Make sure you have DELAY=0 set in the ifcfg file for the bridge on both hosts. thank you very much Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
live migration problems.
Hello, I have problems with live migration. I have several VMs in a CentOS 6.2 cluster environment. When I migrate one virtual machine from nodeA to nodeB the migration goes smoothly but in the same time the VM is migrated an external ping cannot reach the VM. I ping the VM before migration and after the migration is done ping stops to work. This happens for some VM and does not happen for other VM. Apparently the VM are configured the same way so I can't understand why this is happening. If I migrate the VM back to the original physical node the ping start working again like if the switch did not realize the VM mac address changed switch port. To make things work always I Should make a ping from the VM console to whatever host and in this case the arp table is updated on the switch. The strange thing as I said is that some VM seems to always work after migration while other seems never to work untl they are migrated back to original cluster node. Any hints or suggestions ? thank you very much Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
virtio-win problem
Hello, if I install virtio-win drivers on windows 2008 Server R2, I have the problem of signed device drivers. I Can install the drivers but Windows 2008 server refuses to use them unless I start the machine pressing F8 every time at each reboot bypassing the checking of signed certified drivers, and this is annoying, since I Cannot reboot the virtual machien automatically. Anyone solved this issue ? thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Very bad Speed with Virtio-net
I have similar results, like yours, using CentOS 5.4 x86_64 I do not think it is possible to gain more than this right now... or better I wish it could be possible If you can get better result please let me know Rick Benjamin Schweikert wrote: Hello everybody, this is my first post on a mailing list, so i hope everything works fine. My host is a AMD X2 4850e with a 64bit Gentoo (unstable). I have tested qemu-kvm 0.11, 0.12.x and the git version from the 6. jan. I created my own bridges, so i dont need the option from libvirt. I bridged a 1 Gb lan card for my VMs. When I use the virtio net driver, i get something about 200-300 mbit form my desktop to one if my VMs. If iI use the e1000 driver instead of the virtio I get about 500 - 600 mbit. I tested this with the following kernels: Host: 2.6.31.6, 2.6.32.1, 2.6.32.2 Guests: 2.6.26, 2.6.30, 2.6.32 (debian) 2.6.32 (gentoo) Here is a default result, virtio vs. e1000: iperf -c 192.168.0.3 -w 512k -l 512k Client connecting to 192.168.0.3, TCP port 5001 TCP window size: 256 KByte (WARNING: requested 512 KByte) [ 3] local 192.168.0.2 port 52968 connected with 192.168.0.3 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec438 MBytes267 Mbits/sec iperf -c 192.168.0.3 -w 512k -l 512k Client connecting to 192.168.0.3, TCP port 5001 TCP window size: 256 KByte (WARNING: requested 512 KByte) [ 3] local 192.168.0.2 port 52995 connected with 192.168.0.3 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec602 MBytes505 Mbits/sec Any ideas what this could be? I attach a dmesg output of my host. Thx. Ben -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
serial console
hello, how is possible ins ome way to have access to serial console using libvirt ? until now I used quemu-kvm started inside a screen process. but now I am managing my kvm machines with libvirt and in this way I have no access to a serial console. IS there some way to do it ? thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
asymmetric performance for network I/O
Hello, I did some tsts with KVM virtual machines. I gan good results on gigabit interface with inbound traffic, I get almost gigabit saturation (1Gb/s). I have lower perforance outbound that is around 500Mbit/s. Is it normal in your opinion ? I mean is there some hard coded limit for network I/O performance ? any experience of someone else about this topic ? thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: how to manage KVM guests with libvirt ?
thank you very much. How do I know all the XML tag options ?? how to convert from comand line quemu options into XML tags ? and here to put XML file ? about the console I used to start qemu-kvm under SCREEN program. is ther another better way to have serial console ? thank you Rick Javier Guerra wrote: On Mon, Jun 1, 2009 at 9:41 AM, Riccardo Veraldi wrote: Hello, I have always created my guests by hand with qemu-kvm syntax. Is there a way to control and manage KVM guests with libvirt without being forced to create the guest with virtmanager or with virtsh ? i'm doing this, after seeing the managment tools available with libvirt. the easiest way is to write an XML that describes what you already know how to do with command line. there are still a couple of missing options (most notably cache=none, and getting to the command console); but you should be able to get it to work. virt-install is a nice hack for installing well-behaved linux distros; but for windows (where you have to pick exactly which features to expose at different steps of the install), it's easier to do on the command line and write the needed XML after that. one tip, if you choose to allow libvirt to manage an LVM storage pool, it's better not to create/destroy LVs manually. use virsh for that or just don't tell libvirt about your LVM. i had a couple of host crashes when the libvirt view of the storage got inconsistent with reality. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
how to manage KVM guests with libvirt ?
Hello, I have always created my guests by hand with qemu-kvm syntax. Is there a way to control and manage KVM guests with libvirt without being forced to create the guest with virtmanager or with virtsh ? what if I post a guest from XEN to KVM, how to manage it with libvirt ? thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
virtio disk and network performances
Hello, I am little bit disappointed about virtio perormance. speaking about virtio disk performance I get about the same performances of non-virtio quests. I am using centos 5.3 2.6.18-128.1.6.el5 as host and the same centos 5.3 2.6.18-128.1.6.el5 as kvm guests with virtio backported to CentOS 5.2 kernel virtio_net 47169 0 virtio_blk 41417 3 virtio_pci 41921 0 virtio_ring37441 1 virtio_pci virtio 39365 3 virtio_net,virtio_blk,virtio_pci FilesystemSize Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 9.1G 1.5G 7.2G 17% / /dev/vda1 99M 19M 76M 20% /boot tmpfs 502M 0 502M 0% /dev/shm I use bonnie++ for I/O tests and I got closely the same results for virtio guests and non-virtio guests. Anyone experienced something different ? Speaking about virtio net performance I get good results but they are not symmetric. on a virtio guest I get ~1Gb/s inbound and ~600Mb/s outbound without virtio I get ~600Gb/s inbound and ~200MB/s outbound anyone has any idea how come hte performance is not symmetric ? thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
problems with guests time and date
Hello, I have a problem. my host with KVM has correct date set. All the quests has a date 2 hours disaligned, and everytime they boot I must ntpdate hte KVM guests. How to solve this problem ? guest at boot time 22 Apr 09:08:02 ntpdate[1901]: step time server x.y.z.t offset 7297.100104 sec this si the guest [r...@abbone ~]# date Wed Apr 22 09:09:52 CEST 2009 [r...@abbone ~]# hwclock Wed 22 Apr 2009 07:08:19 AM CEST -0.306596 seconds this the host [r...@xenserver2 guest]# hwclock Wed 22 Apr 2009 09:08:46 AM CEST -0.078768 seconds thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
how to convert manual vm to libvirtd management
Hello, I have always created my VM under kvm manually starting them from a .sh script: for example machine called abbone # abbone.sh screen qemu-kvm -nographic -hda ./abbone.img -m 512 -net nic,model=e1000,macaddr=00:16:3e:05:00:07 -net tap -name abbone -vnc :0 I use screen so that I am hook to the serial console and it is so easy to manager machien via serial console. But now I havea problem. I vould like to use virsh to manager my virtual machines. now I installed all my VM MANUALLY vithout using virt-install so I do not have the proper virtual machine XML descriptor files in /etc/libvirt/qemu without a XML description is not possible to start, shutdown, destroy virtual machines via virsh or virt-manager tool. so How can I create an XML file with all the options of the above command ? actually with the above command a proper tapN interface is created upon VM startup via /etc/qemu-ifup script #!/bin/sh set -x switch=sw1 if [ -n "$1" ];then /usr/sbin/tunctl -t $1 /sbin/ip link set $1 up sleep 1 /usr/sbin/brctl addif $switch $1 exit 0 else echo "Error: no interface specified" exit 1 fi thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
kvm network performance
Hello, I am using kvm83 on Centos 5.2 I did some iperf test on my kvm guest and I got the following results over a 1GB connection: ~650Mbit/s inbound ~250Mbit/s outbound that is performance appears to be asymmetric. Is this normal ? The inbound data flow is quite impressive as performance but the outbound is poorer. How come this happens ? I di dtest on the bare machine ad it is around 800Mbit/s inbound and outbound. any hints ? thank you Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Press any key to continue.
hello, I configured my guests runing on KVM83 CentOS 5.2 to run in serial console mode. it works and I use screen to manage multiple consoles. The problem is that when I start a guest on the serial console I got this message repeating few times before the guest effectively start booting. "Press any key to continue." then the guest starts. This does not hapen in VNC mode. anone have any suggestion ? thanks Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
kvm and cpu type
Hello Iam using kvm83 on CentOS5.2 my system has 2x dual Core intel CPU Intel(R) Xeon(R) CPU5110 @ 1.60GHz asdetected by Centos. If I start kvm-qemu with no CPU option everythign works and hte guest machine detects cpu as QEMU Virtual CPU version 0.9.1 iv I run qemu-kvm -cpu core2duo the guest hangs at boot time when it detects the CPU. I do not know how to fix it. I also do not know if using -cpu swtch can improve performances. thank you Rick -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
