[ovirt-users] Re: Need advice using pacemaker on VMs for application HA

On Thu, May 24, 2018 at 6:05 PM, Gianluca Cecchi < gianluca.cecchi(a)gmail.com&gt; wrote: > > > >> >>> - What about the shared storage, we will use a shared disk on oVirt >>> which does not support snapshot >>> >> >> What is the question? >> > > > In the past I had to configure a virtual CentOS 6 cluster because I > needed to replicate a problem I had in a physical production cluster and to > verify if some actions/updates would have solved the problem. > I had no more spare hw to configure an so using the poor-man method (dd + > reconfigure) I had the cluster up and running with two twin nodes identical > to the physical ones. > I also opened this bugzilla to backport the el7 package to el6: > https://bugzilla.redhat.com/show_bug.cgi?id=1446474 > > The intracluster network has been put on OVN btw > > But honestly I doubt I will use a virtual-cluster software stack to > provide high availability to production services inside a VM. Too many > inter-relations > > I didn't complete the answer about storage. Indeed if the cluster services need also a storage (eg a filesystem), you should create dedicated virtual disks that you mark as shared and assign to all the nodes of the virtual-cluster. This compromise the snapshot functionality (of only the shared disks, you can snapshot the boot disk and the not shared disks). HIH, Gianluca