About virtual machine (logical partition) availability

Cluster Server (VCS) provides high availability for logical partitions (LPARs). If an LPAR crashes, it will be automatically restarted or failed over to another physical server. An LPAR can crash due to an LPAR error, a Virtual I/O server (VIOS) error, or physical server error. A VCS cluster can comprise of LPARs. VCS running on these LPARs can manage other LPARs on the physical server that the VCS LPARs runs on. VCS LPARs managing other LPARs are referred to as management LPARs (MLPARs).