June 2015 - Users - libvirt List Archives

[libvirt-users] Help with live Migration
by suthershan sundralingam 08 Jun '15

08 Jun '15

Hi All, I am trying to measure live migration data. I am interested in the following data: TIME elapsed: Data processed: Data remaining: Data total: Constant pages : Normal pages : Normal data : Expected down time : What is the command i am supposed to run? Suthershan

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[libvirt-users] Qemu-Libgfapi: periodical shutdown of virtual machines.
by Igor Yakovlev 08 Jun '15

08 Jun '15

Hello, Would you so kind to help me with my problem concerning libgfapi. My host operating system is Ubuntu 14.04 LTS, version of glusterfs is 3.6.2, and version of qemu is 2.0.0. In our environment guest virtual machines periodically go to power-off state 'Powered Off'(Shutdown) with ERROR in /var/log/syslog like: kernel: [5346607.988173] qemu-system-x86[29564]: segfault at 128 ip 00007f930a90b48c sp 00007f931296fd70 error 4 in qemu-system-x86_64[7f930a57f000+4b1000] Do you have any ideas?... Best regards, Igor.

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[libvirt-users] (no subject)
by Akendo 08 Jun '15

08 Jun '15

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[libvirt-users] agent discovery
by Stuart Kendrick 03 Jun '15

03 Jun '15

How might I discover, via SNMP, which boxes are running libvirt-snmp? Performing a walk from the top seems to skip the Libvirt MIB ... (why is this?) ~/walk$ snmpbulkwalk -c public kvmtestbox .iso | more SNMPv2-MIB::sysDescr.0 = STRING: Linux kvmtestbox.company.com 2.6.32 -358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-TC::linux EXPRESSION-MIB::sysUpTimeInstance = Timeticks: (1308205914) 151 days, 9:54:19.14 [...] SNMP-VIEW-BASED-ACM-MIB::vacmViewTreeFamilyStatus."systemview".9.1.3.6.1.2.1.25. 1.1 = No more variables left in this MIB View (It is past the end of the MIB tre e) I don't see any particular variable I could query ... no equivalent of: LIBVIRT-MIB::libvirtSupport = 1 (yes) Although I suppose a walk starting at the agent's enterprise OID works: ~/walk$ snmpbulkwalk -c public kvmtestbox enterprises.12345 | more LIBVIRT-MIB::libvirtGuestName.'.1..t.X.s>..To..' = STRING: "test1" LIBVIRT-MIB::libvirtGuestName.'7". )...L....(..' = STRING: "test2" LIBVIRT-MIB::libvirtGuestName.'D'q2...*R5y..2&.' = STRING: "test3" [...] But ... if the admin of the hosting box has changed the enterprise OID from '12345' to something more unique, then this doesn't work. How do you discover boxes which support libvirt-snmp? --sk

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[libvirt-users] Missing "block-stream" command in qemu-kvm
by Dallas Graves 03 Jun '15

03 Jun '15

Hi all, I’m experiencing an interesting issue where I’m attempting to consolidate my snapshots’ backing images on my qemu-kvm install by way of the virsh blockpull and/or virsh blockcommit commands and receiving the error that my system can not locate the “block-stream” command. I can’t seem to find much related to this issue by way of my Google research outside of some Bugzilla posts, which leads me to believe that perhaps I’ve missed something during my install, maybe there is an ancillary package I need to install? I’m running qemu-kvm-0.12.1.2-2.448.el6_6.3.x86_64 with libvirt-0.10.2-29.el6_5.12.x86_64 on CentOS 6.6. If anyone has experienced this issue before, advise would be greatly appreciated. Thanks, Dallas G.

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[libvirt-users] Canging bridge names on live migration
by seitan 03 Jun '15

03 Jun '15

Hello, i wonder, if there's a possibility to change a name of a shared interface in virtual machine config, while doing migration. The problem is: hypervisor1 (source) uses shared interface name "br0". hypervisor2 (target) uses shared interface name "br500". Live migration fails, because target hypervisor does not have "br0" interface. Thank you

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[libvirt-users] preallocation=full Vs preallocation=metadata
by Jatin Davey 03 Jun '15

03 Jun '15

Hi All I was reading through this: http://kashyapc.com/2011/12/02/little-more-disk-io-perf-improvement-with-fa… I was basically searching for pointers on improving disk I/O. I wanted to know the purpose of preallocation=full & preallocation=metadata , What is the difference between them ? and which one would yield a better disk I/O speed ? Appreciate your responses in this regard. Thanks Jatin

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[libvirt-users] Bug in Snapshot Removing
by Soeren Malchow 01 Jun '15

01 Jun '15

Dear all I am not sure if the mail just did not get any attention between all the mails and this time it is also going to the libvirt mailing list. I am experiencing a problem with VM becoming unresponsive when removing Snapshots (Live Merge) and i think there is a serious problem. Here are the previous mails, http://lists.ovirt.org/pipermail/users/2015-May/033083.html The problem is on a system with everything on the latest version, CentOS 7.1 and ovirt 3.5.2.1 all upgrades applied. This Problem did NOT exist before upgrading to CentOS 7.1 with an environment running ovirt 3.5.0 and 3.5.1 and Fedora 20 with the libvirt-preview repo activated. I think this is a bug in libvirt, not ovirt itself, but i am not sure. The actual file throwing the exception is in VDSM (/usr/share/vdsm/virt/vm.py, line 697). We are very willing to help, test and supply log files in anyway we can. Regards Soeren

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[libvirt-users] snapshots and vmdk
by Boylan, Ross 01 Jun '15

01 Jun '15

Does libvirt support snapshotting when the virtual disk comes from a vmdk file? http://wiki.libvirt.org/page/Snapshots#Desired_functionality seems to say no, since it says "'virsh snapshot', which requires all disk images to be qcow2". OTOH, man virsh, http://libvirt.org/formatsnapshot.html, and http://libvirt.org/formatdomain.html#elementsDisks seem to indicate more flexibility, though I see nothing about vmdk. If there is support for vmdk, is it just for external snapshots, or do internal snapshots work? Currently running libvirt 0.9.12, qemu-kvm 1.1.2 (though I could use vmware workstation), linux kernel 3.2.0. Thanks. Ross Boylan

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[libvirt-users] Block Commit: [100 %]error: failed to pivot job for disk vda (Bug filed)
by Matthew Schumacher 01 Jun '15

01 Jun '15

Hello List, Seems like blockcopy --wait doesn't work work qemu-2.2.x. I found someone else having the same problem, but it never went anywhere: https://www.redhat.com/archives/libvirt-users/2015-January/msg00045.html I went ahead and did some more debugging and created a bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1210903 I'm going to do some more debugging and hopefully figure this out, but wanted it to post it here so that it gets more attention. Thanks, schu

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