[Users] Designate Master Storage Domain

[Karli Sjöberg]

tor 2013-08-15 klockan 10:46 -0500 skrev Dead Horse:
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
.

Yes I understood that. My suggestion was a workaround until such operations are possible, that we use to minimize downtime as much as possible, to pause the VM's, shut down engine, maintenance, bring engine and VM's back. Since the VM's only was paused and engine shut down, the VM's just continue going happily unknowing exactly from where they were, and a reboot of a storage takes at most 5mins, which means 5mins total of downtime in the cloud environment for that quarter, which is acceptable for just about any SLA.

/Karli


- DHC



On Thu, Aug 15, 2013 at 9:37 AM, Itamar Heim <iheim at redhat.com<mailto: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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Karli Sjöberg
Swedish University of Agricultural Sciences
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