Great root call analysis!

Maybe we should add something like 'outage' guidelines on the wiki or readthedocs for any infra member that is about to do something 

that might affect the DC?

Probably email to the infra/devel list should be OK, or even emailing to infra-support@ovirt.org so there will be an open ticket.

thoughts?

E.

On Tue, Feb 9, 2016 at 4:18 PM, David Caro <dcaro@redhat.com> wrote:

On 02/08 20:28, David Caro wrote:
>
> Hi everyone!
>
> There has been a storage outage today, it started around 17:30 CEST and spanned
> until ~20:15. All the services are back up now and running, but a bunch of
> jenkins jobs failed due to the outage (all the slaves are using that storage)
> so you might see some false positives in your ci runs. To retrigger you can use
> this job:
>
>     http://jenkins.ovirt.org/gerrit_manual_trigger/
>
> And/or submit a new patchset (rebasing should work). In any case, if you have
> any issues or doubts, please respond to this email or ping me (dcaro/dcaroest)
> on irc.
>
> Sorry for the inconvenience, we are gathering logs to find out what happend and
> prevent it from happening in the future.


So the source of the issue has been sorted out, there was some uncoordinated
effort that ended up changing the LACP settings in the switches for all the
hosts, what caused a global network outage (all the hosts were affected) and
that in turn caused the clustering to freeze as none of the nodes was able to
contact the network both went down.

Then, once the network came up, the master of the cluster tried to remount the
drdb storage but was unable to due to some process keeping it busy, and did not
fully start up.

That is a scenario that we did not test (we tested one node failure, not both)
so will have to investigate that failure case and find a solution for the
clustering.

We are also talking with the hosting to properly sync with us on that type of
interventions so this will not happen again.


Thanks for your patience

>
> --
> David Caro
>
> Red Hat S.L.
> Continuous Integration Engineer - EMEA ENG Virtualization R&D
>
> Tel.: +420 532 294 605
> Email: dcaro@redhat.com
> IRC: dcaro|dcaroest@{freenode|oftc|redhat}
> Web: www.redhat.com
> RHT Global #: 82-62605



--
David Caro

Red Hat S.L.
Continuous Integration Engineer - EMEA ENG Virtualization R&D

Tel.: +420 532 294 605
Email: dcaro@redhat.com
IRC: dcaro|dcaroest@{freenode|oftc|redhat}
Web: www.redhat.com
RHT Global #: 82-62605

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--

Eyal Edri
Associate Manager
EMEA ENG Virtualization R&D
Red Hat Israel

phone: +972-9-7692018
irc: eedri (on #tlv #rhev-dev #rhev-integ)