In part 1 of the series of post on the impact of oversized virtual machines NUMA architecture, memory overhead reservation and share levels are reviewed, part 2 zooms in of the impact of memory overhead reservation and share levels on HA and DRS. Impact of memory overhead reservation on HA Slot size The VMware High [...]

Due to requirements or constraints it might be necessary to exclude a virtual machine from automatic migration and stop it from moving around by DRS. Use the “Partially automated” setting instead of “Disabled” at the individual virtual machine automation level. Partially automated blocks automated migration by DRS, but keep the initial placement function. During startup, [...]

Duncan’s article on vCloud Allocation models states that: a provider vDC can be a VMware vSphere Cluster or a Resource Pool … Although vCloud Director offers the ability to map Provider vDCs to Clusters or Resource Pool, it might be better to choose for the less complex solution. This article zooms in on the compute [...]

Another reason to upgrade to vSphere 4.1 is the DRS adaptive MaxMovesPerHost parameter. The MaxMovesPerHost setting determines the maximum amount of migrations per host for DRS load balancing. DRS evaluates a cluster and recommends migrations. By default this evaluation happens every 5 minutes. There are limits to how many migrations DRS will recommend per interval [...]