OCFS2 in SUSE Linux High Availability (SLE HA) SP1 (and newer) supports reflinks (also referred to as refcounted links), providing significant performance advantages over a standard filesystem-level copy (cp) when you clone Xen VM images on SUSE Linux Enterprise Servers acting as VM Hosts. As a Cloud Manager Orchestration Server administrator, you might need control over whether the xen provisioning adapter should copy disk image files using reflinks or normal cp.
The Orchestration Server includes two Boolean facts that control the reflinks tuning for VMs and repositories. By default, these facts are marked true and accommodate the reflinks feature when it is available:
resource.vm.useReflinks
repository.useReflinks
If specified, the resource.vm.useReflinks fact takes precedence over the corresponding repository.useReflinks fact.