Re: [ovirt-users] Changing of master storage domain

[Nicolas Ecarnot]

Le 13/05/2016 12:06, Nir Soffer a écrit :

Nir,

Would there be any benefit thus any plan to add the feature to be able to
select the master domain, the same way we can do it with the SPM?


I don't know about any benefit.


There could be cases where we would want to free a storage domain from being
master, but without putting it into maintenance.


Like?


At multiple times, I had to do maintenance actions on the SAN side which 
are neither SUPPOSED to break anything, nor be visible by oVirt, but in 
case of failure, I would have been glad to choose which storage domain 
to preserve at all cost, though not putting any SD into maintenance.


It is often related to external actions not driven by oVirt, but as 
oVirt as a potential side-effect victim. (other examples related to 
network modifications)




We are working now on removing the master domain (part of spm removal). It is
unlikely that we will add any feature related to the master domain.


Well, I couldn't hope more, that will be perfect.

4.x ?

Thank you Nir.

--
Nicolas ECARNOT
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Re: [ovirt-users] Changing of master storage domain

[Nir Soffer]

On Fri, May 13, 2016 at 10:35 AM, Nicolas Ecarnot  wrote:
> Le 13/05/2016 09:22, Nir Soffer a écrit :
>>
>> On Thu, May 12, 2016 at 6:24 PM, Roman A. Chukov
>>  wrote:
>>>
>>> Hello there,
>>>
>>> I have a question about the algorithm of changing of master storage
>>> domain.
>>> I have a fresh installation of oVirt 3.6 on 2 hardware nodes, using a
>>> number
>>> of NFS shares as storage domains, and one of them was a master. When I
>>> was
>>> adding the second node into cluster, master storage domain had been
>>> changed
>>> by oVirt. Actually it didn't bring any harmful consequences at that point
>>> but it was unexpected for me. So, could anybody please explain such
>>> behavior
>>> of oVirt and also explain whether I could change master storage domain
>>> back
>>> to the previous?
>>
>>
>> You cannot select the master domain, the master is selected
>> automatically by ovirt.
>>
>> You can move the master domain from the current domain by putting the
>> domain
>> to maintenance, the system will move the master to domain to another
>> domain.
>>
>> Nir
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>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
> Nir,
>
> Would there be any benefit thus any plan to add the feature to be able to
> select the master domain, the same way we can do it with the SPM?

I don't know about any benefit.

> There could be cases where we would want to free a storage domain from being
> master, but without putting it into maintenance.

Like?

We are working now on removing the master domain (part of spm removal). It is
unlikely that we will add any feature related to the master domain.

Nir
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Re: [ovirt-users] Changing of master storage domain

[Nicolas Ecarnot]

Le 13/05/2016 09:22, Nir Soffer a écrit :

On Thu, May 12, 2016 at 6:24 PM, Roman A. Chukov
 wrote:

Hello there,

I have a question about the algorithm of changing of master storage domain.
I have a fresh installation of oVirt 3.6 on 2 hardware nodes, using a number
of NFS shares as storage domains, and one of them was a master. When I was
adding the second node into cluster, master storage domain had been changed
by oVirt. Actually it didn't bring any harmful consequences at that point
but it was unexpected for me. So, could anybody please explain such behavior
of oVirt and also explain whether I could change master storage domain back
to the previous?


You cannot select the master domain, the master is selected
automatically by ovirt.

You can move the master domain from the current domain by putting the domain
to maintenance, the system will move the master to domain to another domain.

Nir
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Nir,

Would there be any benefit thus any plan to add the feature to be able 
to select the master domain, the same way we can do it with the SPM?


There could be cases where we would want to free a storage domain from 
being master, but without putting it into maintenance.


--
Nicolas ECARNOT
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Re: [ovirt-users] Changing of master storage domain

[Nir Soffer]

On Thu, May 12, 2016 at 6:24 PM, Roman A. Chukov
 wrote:
> Hello there,
>
> I have a question about the algorithm of changing of master storage domain.
> I have a fresh installation of oVirt 3.6 on 2 hardware nodes, using a number
> of NFS shares as storage domains, and one of them was a master. When I was
> adding the second node into cluster, master storage domain had been changed
> by oVirt. Actually it didn't bring any harmful consequences at that point
> but it was unexpected for me. So, could anybody please explain such behavior
> of oVirt and also explain whether I could change master storage domain back
> to the previous?

You cannot select the master domain, the master is selected
automatically by ovirt.

You can move the master domain from the current domain by putting the domain
to maintenance, the system will move the master to domain to another domain.

Nir
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