Defining disjoint node groups for virtual machines with pre-existing placement policies

A method implemented by a computer system adapted to generate disjoint node groups for a node cluster to thereby guarantee hardware redundancy for each of a plurality of service groups to be configured on the node cluster, wherein each service group includes a plurality of service units, and wherein each service unit is a unit of redundancy for services provided and protected by the service group, the method comprising the steps of:

• identifying a hardware dependency between virtual machines in the node cluster and hardware elements to host the virtual machines;
• forming a first node group set (NG set) of node groups using a first selection criterion to select the virtual machines into different node groups based on the hardware dependency, such that there is no common hardware element between any two of the node groups in the first NG set;
• mapping the first NG set to a first set of the service groups;
• mapping different node groups of the first NG set to different service units in each service group of the first set of the service groups;
• and
• placing a virtual machine that has not yet been selected into a leftovers set if the virtual machine depends on a same hardware element as another virtual machine in a previously-formed node group for a same NG set.

A computer system adapted to generate disjoint node groups for a node cluster to thereby guarantee hardware redundancy for each of a plurality of service groups to be configured on the node cluster, wherein each service group includes a plurality of service units, and wherein each service unit is a unit of redundancy for services provided and protected by the service group, the computer system comprising a processor and a memory, the memory containing instructions executable by the processor whereby the computer system is operative to:

• identify a hardware dependency between virtual machines in the node cluster and hardware elements to host the virtual machines;
• form a first node group set (NG set) of node groups using a first selection criterion to select the virtual machines into different node groups based on the hardware dependency, such that there is no common hardware element between any two of the node groups in the first NG set;
• map the first NG set to a first set of the service groups;
• and
• map different node groups of the first NG set to different service units in each service group of the first set of the service groups,
• wherein the hardware dependency is defined in a Platform Management (PLM) Service configuration for the node cluster, wherein the PLM configuration specifies a containment relationship between the hardware elements and virtual machine monitors, and a dependency relationship between the virtual machine monitors and the virtual machines that allows migration of the virtual machines at runtime.

A computer system adapted to generate disjoint node groups for a node cluster to thereby guarantee hardware redundancy for each of a plurality of service groups to be configured on the node cluster, wherein each service group includes a plurality of service units, and wherein each service unit is a unit of redundancy for services provided and protected by the service group, the computer system comprising a processor and a memory, the memory containing instructions executable by the processor whereby the computer system is operative to:

• identify a hardware dependency between virtual machines in the node cluster and hardware elements to host the virtual machines;
• form a first node group set (NG set) of node groups using a first selection criterion to select the virtual machines into different node groups based on the hardware dependency, such that there is no common hardware element between any two of the node groups in the first NG set;
• map the first NG set to a first set of the service groups;
• map different node groups of the first NG set to different service units in each service group of the first set of the service groups;
• and
• place a virtual machine that has not yet been selected into a leftovers set if the virtual machine depends on a same hardware element as another virtual machine in a previously-formed node group for a same NG set.