[Users] rebooting physical network that ovirt is attached to

[Lior Vernia]

+1, better solution than mine (safer, simpler), thank you Alex. Do still
keep in mind the possible trouble with thin provisioning.

On 24/03/13 14:39, Alex Leonhardt wrote:
> From experience, I would shutdown the ovirt engine before you do any
> work related to networking. The VMs will keep running w/o the engine
> available, you're simply unable to add/remove/failover VMs, etc. The
> VDSM running on the host will be unable to get instructions to "kill"
> any VMs as the engine is already "down" :) ...
> 
> hope it helps!
> alex
> 
> 
> 
> 
> On 03/24/2013 10:04 AM, Lior Vernia wrote:
>> Hello Jonathan,
>>
>> First of all let me apologize for not being more responsive, seems like
>> you got the worse end of time difference.
>>
>> Now, in case the question is still relevant:
>>
>> 1. Rebooting the first switch won't cause any damage. The VMs will lose
>> connectivity on the VLANs, but they should still be manageable through
>> oVirt and run normally on their hosts.
>>
>> 2. Rebooting the second one could prove more troublesome. Firstly, as a
>> preemptive measure I would advise that you not have any VMs running on
>> your host marked as SPM at the moment of reboot, if possible - there's
>> risk that VMs running on your SPM will be shut down violently when it
>> loses connectivity (or the moment it regains connectivity). Also, if any
>> of your VMs have thin provisioning defined and they exhaust their
>> storage during downtime, they'll run into trouble; but as far as I know
>> they should be okay if they're not running processes that can suddenly
>> demand a lot more storage. That's as far as possible damage goes.
>> Besides that, when the switch comes back up, some components (host, data
>> domain) might appear as non-operational or down, and you might have to
>> reactivate them manually from the webadmin console.
>>
>> Hope this helps.
>>
>> Yours, Lior Vernia.
>>
>> On 21/03/13 20:42, Jonathan Horne wrote:
>>> greetings,
>>>
>>> we are talking about possibly upgrading our cisco gear tonight, and this
>>> will affect our ovirt environment.
>>>
>>> what can i expect if i were to reboot first the switch that all VMguest
>>> VLANs are going thru, ad then afterwards rebooting the switch that all
>>> ovirtmgmt connections are in?  how will the ovirt environment behave
>>> with loss of network connectivity for a couple minutes?
>>>
>>> the iscsi network is not going to be affected.  any information or
>>> stories of similar experiences would be appreciated.
>>>
>>> thanks,
>>> jonathan
>>>
>>>
>>> ------------------------------------------------------------------------
>>> This is a PRIVATE message. If you are not the intended recipient, please
>>> delete without copying and kindly advise us by e-mail of the mistake in
>>> delivery. NOTE: Regardless of content, this e-mail shall not operate to
>>> bind SKOPOS to any order or other contract unless pursuant to explicit
>>> written agreement or government initiative expressly permitting the use
>>> of e-mail for such purpose.
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users