Hi Pavel, I tested as advised. And aaaaaaargh hit the next two OVirt bugs....
https://bugzilla.redhat.com/show_bug.cgi?id=1326900 Nevertheless: Merging only one disk at once works as expected. The VM stays up, keeps running and is responsive. Markus ________________________________________ Von: Pavel Gashev [p...@acronis.com] Gesendet: Mittwoch, 13. April 2016 15:12 An: Markus Stockhausen; users Betreff: Re: AW: [ovirt-users] stalls during live Merge Centos 7 / qemu 2.3 Markus, So all CPU threads are blocked by the main loop. The main loop is busy draining IO requests from all drives while there are other block commit jobs active... It looks like currently QEMU just can't live merge more than one drive simultaneously without blocking VCPUs. As workaround you can delete disk snapshots one-by-one, and then delete disk-less VM snapshot. The Storage tab has Disk Snapshots sub tab where you can remove a specific snapshot of a specific disk. On 12/04/16 21:39, "Markus Stockhausen" <stockhau...@collogia.de> wrote: >> Von: Pavel Gashev [p...@acronis.com] >> Gesendet: Dienstag, 12. April 2016 16:15 >> An: Markus Stockhausen; users >> Betreff: Re: [ovirt-users] stalls during live Merge Centos 7 / qemu 2.3 >> >> Markus, >> >> I saw similar issues. Looks like it's related to multidisk VMs under high >> disk load. No relations with guest OS. No relations with IO threads. >> >> >> I didn't debug it. Can you please show a backtrace of a thread in >> __lll_lock_wait ? > >Hi Pavel. > >thanks for your response. I dont even need high disk load to >reproduce the issue. Just a simple script that writes 8k blocks >every 0.5 secs. I added the required info to the BZ. > >https://bugzilla.redhat.com/show_bug.cgi?id=1319400 > >Markus > >> >> >> On 11/04/16 18:13, "users-boun...@ovirt.org on behalf of Markus Stockhausen" >> <users-boun...@ovirt.org on behalf of stockhau...@collogia.de> wrote: >> >> >Hi there, >> > >> >I'm getting slowly mad about our new Centos 7 cluster. Whenever >> >I start a live merge the machine completely freezes. It seems to be >> >independent of the Guest OS (tried SLES 11 SP3, SLES11 SP4 and >> >SLES12). I already opened BZ1319400 because I'm clueless. >> > >> >Doing the same in our Fedora 20 cluster (qemu 2.1.3) we only see >> >small hiccups of 1-3 seconds at the start of the live merge but no >> >complete stall. Its the same VM! >> > >> >Just to be sure that it is not a specific problem of our topology >> >or SLES I would like to receive some feedback of the list if anyone >> >observes similar lockups in their environment. >> > >> >Thanks in advance. >> > >> >Markus >> >
**************************************************************************** Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. Ãber das Internet versandte E-Mails können unter fremden Namen erstellt oder manipuliert werden. Deshalb ist diese als E-Mail verschickte Nachricht keine rechtsverbindliche Willenserklärung. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln Vorstand: Kadir Akin Dr. Michael Höhnerbach Vorsitzender des Aufsichtsrates: Hans Kristian Langva Registergericht: Amtsgericht Köln Registernummer: HRB 52 497 This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. e-mails sent over the internet may have been written under a wrong name or been manipulated. That is why this message sent as an e-mail is not a legally binding declaration of intention. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln executive board: Kadir Akin Dr. Michael Höhnerbach President of the supervisory board: Hans Kristian Langva Registry office: district court Cologne Register number: HRB 52 497 ****************************************************************************
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
