Hello again, Hope everyone's ok. I'm really sorry for being so late, but I came back with the update. We wanted to upgrade the memory because we plan on deploying several VMs on the platform, mostly for services, and thought that now was a better time to do the upgrade than later on. I manually migrated some of the VMs on one another node, trying to keep the percentage of the physical memory of each node somewhat equal. The upgrade of the memory of the nodes happened with no problem (from 32GB to 72GB). The VMs that were active on the time (8 VMs including HE) didn't show any kind of downtime, slow-down or any other issue. The percentage of the memory of the two on-line nodes at the time was around 75-80%, with the HE consuming the most. The upgrade happened right after I had to replace a failed SAS HDD (hot-plug) which contained the mirror of the HDD with the ovirt node OS. Everything went as my team and I hoped with no problems on either side. For the storage; the deployment we have is GlusterFS with one node as arbiter. When the node rejoined the others, it took around 8-10 mins for the healing operations to be completed and since then everything's going perfectly well. Thank you all for the time you took to respond to me and the valuable information you shared. It means a lot. Best regards, Maria