Itamar this is true (I have noted occasional timing issues with it actually working). But what if as the administrator I have a specific storage domain in mind that I would like to have become the master (in the case of more then two)? @Karli The idea is not to not have to shut down all the VM's or the engine just to maintenance a storage domain(s) that may happen to be on disparate storage servers . - DHC On Thu, Aug 15, 2013 at 9:37 AM, Itamar Heim <iheim@redhat.com> wrote:
On 08/15/2013 06:18 AM, Dead Horse wrote:
Is there any method of designating which domain should be the master storage domain or forcibly changing the role to a different storage domain?
EG: Given the following example
Storage Domain A (Master) --> NFS --> Storage Server 1 Storage Domain B --> NFS --> Storage Server 2
One wants to do maintenance to Storage Server 1 but in doing so the Master storage domain is hosted from Storage Server 1. Thus the net result of taking down Storage Server 1 is that one must also take down Storage Server 2.
Thus we know we must shut down VM's from Storage Domain A to maintenance Storage Server 1. Suppose however that VM's are running that we don't want to shut down and are hosted from Storage Domain B via Storage Server 2.
We would want to be able to promote Storage Domain B to Master so that we can take down Storage Domain A to do maintenance to Storage Server 1.
Once we are done with maintenance to Storage Server 1 we can bring Storage Domain A back on line, re-designate it as Master if desired and bring it's VM's back online.
I know I have seen this occur automatically to a point when a Storage Domain goes missing that is the Master Domain but I have not noted any manual method of doing so given the above scenario.
- DHC
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my understanding is you can move the storage domain A which is master to maint. engine will promote storage domain B to master and everything should continue working as is.