From engine logs, I see "Could not connect host to Data Center(Storage issue)" but there are no errors in the attached vdsm.log. Can you provide the relevant vdsm log and also the gluster mount logs?

From: "Robin Vanderveken" <rvanderveken(a)dlttechnologies.com&gt; To: users(a)ovirt.org Sent: Monday, July 25, 2016 2:01:24 PM Subject: [ovirt-users] oVirt 4 master storage down - unable to activate after power loss Dear oVirt users I've been having several problems with my oVirt nodes utilising GlusterFS after simulating a power loss. Our testing setup for oVirt consists of 3 nodes, 2 with GlusterFS storage and 1 just for computing. Everything seems to be setup correct and was working correctly. Then after simulating a power loss the master storage goes down, and therefore the VMs and data center go down as well. I checked the GlusterFS configuration and it seems to be correct (see attachment). I checked the oVirt configuration and it seems to be correct (see attachment). I tried putting several Nodes in Maintenace several times, even putting in maintenance and reinstalling them. Only when putting the nodes in maintenance (and choosing to stop the GlusterFS service) triggers Contending on the other Nodes. Only then there is a chance that a Node goes from Contending to SPM, which does not always happen. After trying this several times I got a main Node to become SPM, but the master storage remains down. When I select the master storage, go in the Data center, select the data center and click Activate, then both the master storage and the data center go in the state Locked for a few seconds and then Inactive again. Then I upgraded to oVirt 4 ( oVirt Engine Version: 4.0.0.6-1.el7.centos) and tried everything again, resulting in the same result. I searched online and found this mailing list which is very similar: http://lists.ovirt.org/pipermail/users/2014-August/026905.html . Unfortunately the solution was not posted/mailed. I also found this: https://www.mail-archive.com/users@ovirt.org/msg08105.html suggesting the kernel version is not correct, but I am unsure how to check this. In the attachment I added relevant logs: - GlusterFS service on both main nodes - /var/log/vdsm/vdsm.log , /var/log/vdsm/supervdsm.log , /var/log/messages , /var/log/sanlock.log , /var/log/ovirt-engine/engine. log-20160725.gz , /var/log/ovirt-engine/engine.log of the oVirt engine as attachments (I clicked on Activate on the data center at 9:45:30 am GMT). It can be possible that I need to send different engine logs, please tell me if necessary. Any help would be highly appreciated. Kind regards Robin Vanderveken -- Robin Vanderveken DLT Technologies Tel. +352 691 412 922 Disclaimer Les informations contenues dans ce message sont destinées exclusivement à l’usage de la personne à laquelle elles sont adressées. Elles peuvent contenir des données confidentielles et/ou privilégiées et/ou protégées par des droits de propriété intellectuelle ou d’autres lois. Si vous avez reçu ce message par erreur, veuillez le détruire, ainsi que toutes ses annexes, et notifier son expéditeur ; il vous est interdit de copier ou d’utiliser ce messages ou ses annexes ou de divulguer son contenu à quiconque. La transmission de données par e-mail ne peut être garantie comme un moyen sûr et infaillible, ni comme étant exempt de tout virus. L’expéditeur décline toute responsabilité en cas de perte ou de dommage résultant de ce message ou de son utilisation, quelle qu’elle soit. The information contained in this message is intended for the addressee only and may contain confidential and/or privileged information and/or information protected by intellectual property rights or other legal rules. If you are not the intended recipient, please delete this message and any attachment to it and notify the sender; you may not copy or use this message or its attachments in any way nor disclose its contents to anyone. Emails cannot be guaranteed to be secure or to be error or virus free. No liability is accepted by the sender for any loss damage arising in any way from this message or its use. _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users

Your command was very helpful! It seems to be a split-brain error! I should be able to fix this, I'll let you know when it's fixed. We are aware that 2 gluster volumes is not recommended, we didn't know a minimum of 3 is needed to counter a power loss. The output of "gluster volume heal <volume_name> info" is: [root@ovirt-node2 ~]# gluster volume heal vol1 info Brick 10.0.0.194:/gluster-bricks/vol1/vol1 /9d1a204c-1b1a-450f-986d-a8c84babb4c1/dom_md/ids - Is in split-brain /__DIRECT_IO_TEST__ - Is in split-brain /9d1a204c-1b1a-450f-986d-a8c84babb4c1/dom_md/inbox - Is in split-brain /9d1a204c-1b1a-450f-986d-a8c84babb4c1/dom_md/leases - Is in split-brain Status: Connected Number of entries: 4 Brick 10.0.0.199:/gluster-bricks/vol1/vol1 <gfid:b9d48873-846d-4964-93c7-0a662de04d22> - Is in split-brain /__DIRECT_IO_TEST__ - Is in split-brain <gfid:cbc7b097-e600-43d3-8f20-9626f6d0239b> - Is in split-brain <gfid:cfa177c0-91fa-4649-b99b-73e03ddbc756> - Is in split-brain Status: Connected Number of entries: 4 ​I also added GlusterFS logs, I was unsure which you needed so I added as many as possible. Kind regards Robin Vanderveken On 25 July 2016 at 15:49, Sahina Bose <sabose(a)redhat.com&gt; wrote: > First off, a replica 2 gluster volume is not recommended if you want to > survive power loss - you need to have a replica 3 gluster volume. > > From engine logs, I see "Could not connect host to Data Center(Storage > issue)" but there are no errors in the attached vdsm.log. Can you provide > the relevant vdsm log and also the gluster mount logs? > > What's the output of "gluster volume heal <volname> info" ? > > ----- Original Message ----- > > From: "Robin Vanderveken" <rvanderveken(a)dlttechnologies.com&gt; > > To: users(a)ovirt.org > > Sent: Monday, July 25, 2016 2:01:24 PM > > Subject: [ovirt-users] oVirt 4 master storage down - unable to > activate after power loss > > > > Dear oVirt users > > > > I've been having several problems with my oVirt nodes utilising > GlusterFS > > after simulating a power loss. > > > > Our testing setup for oVirt consists of 3 nodes, 2 with GlusterFS > storage and > > 1 just for computing. Everything seems to be setup correct and was > working > > correctly. Then after simulating a power loss the master storage goes > down, > > and therefore the VMs and data center go down as well. > > > > I checked the GlusterFS configuration and it seems to be correct (see > > attachment). I checked the oVirt configuration and it seems to be > correct > > (see attachment). I tried putting several Nodes in Maintenace several > times, > > even putting in maintenance and reinstalling them. Only when putting the > > nodes in maintenance (and choosing to stop the GlusterFS service) > triggers > > Contending on the other Nodes. Only then there is a chance that a Node > goes > > from Contending to SPM, which does not always happen. After trying this > > several times I got a main Node to become SPM, but the master storage > > remains down. When I select the master storage, go in the Data center, > > select the data center and click Activate, then both the master storage > and > > the data center go in the state Locked for a few seconds and then > Inactive > > again. > > > > Then I upgraded to oVirt 4 ( oVirt Engine Version: > 4.0.0.6-1.el7.centos) and > > tried everything again, resulting in the same result. > > > > I searched online and found this mailing list which is very similar: > > http://lists.ovirt.org/pipermail/users/2014-August/026905.html . > > Unfortunately the solution was not posted/mailed. I also found this: > > https://www.mail-archive.com/users@ovirt.org/msg08105.html suggesting > the > > kernel version is not correct, but I am unsure how to check this. > > > > In the attachment I added relevant logs: > > - GlusterFS service on both main nodes > > - /var/log/vdsm/vdsm.log , /var/log/vdsm/supervdsm.log , > /var/log/messages , > > /var/log/sanlock.log , /var/log/ovirt-engine/engine. log-20160725.gz , > > /var/log/ovirt-engine/engine.log of the oVirt engine > > as attachments (I clicked on Activate on the data center at 9:45:30 am > GMT). > > It can be possible that I need to send different engine logs, please > tell me > > if necessary. Any help would be highly appreciated. > > > > Kind regards > > Robin Vanderveken > > > > -- > > Robin Vanderveken > > DLT Technologies > > Tel. +352 691 412 922 > > > > Disclaimer > > > > Les informations contenues dans ce message sont destinées exclusivement > à > > l’usage de la personne à laquelle elles sont adressées. Elles peuvent > > contenir des données confidentielles et/ou privilégiées et/ou protégées > par > > des droits de propriété intellectuelle ou d’autres lois. Si vous avez > reçu > > ce message par erreur, veuillez le détruire, ainsi que toutes ses > annexes, > > et notifier son expéditeur ; il vous est interdit de copier ou > d’utiliser ce > > messages ou ses annexes ou de divulguer son contenu à quiconque. La > > transmission de données par e-mail ne peut être garantie comme un moyen > sûr > > et infaillible, ni comme étant exempt de tout virus. L’expéditeur > décline > > toute responsabilité en cas de perte ou de dommage résultant de ce > message > > ou de son utilisation, quelle qu’elle soit. > > > > The information contained in this message is intended for the addressee > only > > and may contain confidential and/or privileged information and/or > > information protected by intellectual property rights or other legal > rules. > > If you are not the intended recipient, please delete this message and > any > > attachment to it and notify the sender; you may not copy or use this > message > > or its attachments in any way nor disclose its contents to anyone. > Emails > > cannot be guaranteed to be secure or to be error or virus free. No > liability > > is accepted by the sender for any loss damage arising in any way from > this > > message or its use. > > > > _______________________________________________ > > Users mailing list > > Users(a)ovirt.org > > http://lists.ovirt.org/mailman/listinfo/users > > > -- Robin Vanderveken DLT Technologies Tel. +352 691 412 922