[Users] Designate Master Storage Domain

[Liron Aravot]

----- Original Message -----
> From: "Dead Horse" <deadhorseconsulting at gmail.com>
> To: "Itamar Heim" <iheim at redhat.com>
> Cc: "<users at ovirt.org>" <users at ovirt.org>
> Sent: Thursday, August 15, 2013 6:46:00 PM
> Subject: Re: [Users] Designate Master Storage Domain
> 
> 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)?

In that case - you could reinitialize the pool using unattached domain (you chose which one) - this domain will become the new master.
1. Create new unattached domain/Detach the domain that you want to be the master from the pool (if possible)
2. Move all the pool domain to maintenance (the master should be put to maintenance last to avoid reconstructing to another domain).
3. Right click on the data center, chose reinitialize storage pool - you can chose which domain do you want to be the master from the unattached domains.

The other option is manual db intervention :)
Possibly we could add a possibility to manually change the master domain, same as was added for the spm ("Make SPM" button that was added recently).


> 
> @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 at 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.
> 
> 
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