[Users] Storage domain weirdness (or design)

[Alex Leonhardt]

Hmmm, but if I put the SPM host into Maint mode, then all the VMs would
either be migrated or (in my case, all set to manual) not available during
that time, correct ?

Would changing the SPM priority in the host config have the desired effect
w/o putting the host into Maint mode ? Or can I only do that when the host
is in Maint mode ?


On 17 January 2013 20:42, Maor Lipchuk <mlipchuk at redhat.com> wrote:

> Hi Alex,
> See my last respond, I add a comment inline there.
> See my comments inline
>
> Regards,
> Maor.
>
> On 01/17/2013 10:04 PM, Alex Leonhardt wrote:
> > Hiya,
> >
> > Yes i can choose the storage domain, but I cannot force the host that is
> > to be used for creating it. Even with 1Gbit network, creating a 80GB
> > disk / 40 GB disk is still significantly longer process than actually
> > required when doing a "dd" of /dev/null over the network.
> >
> > Is it possible to manually change who is SPM master, create the
> > disks/VMs required, and change it back ?
> You can maintain your SPM host, and active it back again, this will
> change the SPM to be the other host which you want.
> > How would that change affect the running VMs / would they try to migrate
> to the other HV ?
> The VM migration will still be under the same cluster.
>
> SPM is simply used to write to the storage domains, one of the reasons
> we use the SPM is to avoid collisions when hosts write to the same
> storage domain.
>
> >
> > Alex
> >
> >
> > On 01/17/2013 07:39 PM, Maor Lipchuk wrote:
> >> Hi Alex,
> >> The storage domains are part of the Data Center, and should not be
> >> related to clusters.
> >> Clusters are used for migrating VMs, which are the qemu processes,
> >> between hosts.
> >> Disks are created on the storage domains regardless to clusters.
> >>
> >> The host which write the data in the storage domain to create the disk
> >> is the SPM.
> >> You should have only one SPM in each Data Center (You can spot which
> >> host is your SPM by looking at the SPM column in the hosts tab)
> >> When you create a disk you should be able to choose the storage domain
> >> which you want the disk to be created on.
> >>
> >> Regards,
> >> Maor
>
>
>


-- 

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