Re: [Users] Storage domain weirdness (or design)

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(a)redhat.com&gt; 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 | www.vsearchcloud.com |