[Users] Storage domain weirdness (or design)

[Maor Lipchuk]

Hi Alex,
What that you suggest is pretty similar to have two different Data Center.
One with host HV1 and storage domain 1.
The other with storage_domain_2 and HV2 host.
This might work, and your two hosts will be SPM, one for DC1 and the
other for DC2
I'm not sure that I follow your suggestion about setting the storage
domains who is the master (the SPM will still stay the same host as before).

Regards,
Maor


On 01/18/2013 11:36 AM, Alex Leonhardt wrote:
> I was just thinking - maybe adding a setting to storage domains who's
> the "master" for that specific storage domain would get around this ?
> 
> e.g. storage_domain_1 => master = HV1, storage_domain_2 => master = HV2,
> etc. etc.
> 
> What do you think ?
> 
> Alex
> 
> 
> 
> On 18 January 2013 09:34, Alex Leonhardt <alex.tuxx at gmail.com
> <mailto:alex.tuxx at gmail.com>> wrote:
> 
>     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
>     <mailto: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
> 
> 
> 
> 
> 
>     -- 
> 
>     | RHCE | Senior Systems Engineer | www.vcore.co
>     <http://www.vcore.co> | www.vsearchcloud.com
>     <http://www.vsearchcloud.com> |
> 
> 
> 
> 
> -- 
> 
> | RHCE | Senior Systems Engineer | www.vcore.co <http://www.vcore.co> |
> www.vsearchcloud.com <http://www.vsearchcloud.com> |