Hierarchical services startup sequencing

A system for managing services within a data storage subsystem during a startup sequence, comprising:

• a processor operational in the data storage subsystem, wherein the processor is adapted for:
• defining at least one a first service facilitated by a provider, wherein the provider is operational by the processor,
• linking at least one requirement to the first service,
• incorporating the first service and the at least one requirement into a specification file,
• constructing a directed acyclic graph interrelating the first service and a second service based on the at least one requirement, and
• traversing the directed acyclic graph using an initialization process to generate a determination which of an available plurality of services to provide;
• wherein:
• the determination further includes an analysis of the which of the available plurality of services to provide in view of at least one hardware resource in the data storage subsystem, and
• constructing the directed acyclic graph comprises interrelating the first service and the second service based on one of a weak requirement dependency and a strong requirement dependency of the first service and the second service, the weak requirement dependency comprising starting the second service after starting the first service and the strong requirement dependency comprising starting the second service prior to starting the first service.

A computer program product for managing services within a data storage subsystem using a processor in communication with a memory device during a startup sequence, the computer program product comprising a non-transistory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:

• a first executable portion for defining a first service facilitated by a provider, wherein the provider is operational by the processor;
• a second executable portion for linking at least one requirement to the first service;
• a third executable portion for incorporating the first service and the at least one requirement into a specification file;
• a fourth executable portion for constructing a directed acyclic graph interrelating the first service and a second service based on the at least one requirement;
• and
• a fifth executable portion for traversing the directed acyclic graph using an initialization process to generate a determination which of an available plurality of services to provide;
• wherein:
• the determination further includes an analysis of the which of the available plurality of services to provide in view of at least one hardware resource in the data storage subsystem, and
• constructing the directed acyclic graph comprises interrelating the first service and the second service based on one of a weak requirement dependency and a strong requirement dependency of the first service and the second service, the weak requirement dependency comprising starting the second service after starting the first service and the strong requirement dependency comprising starting the second service prior to starting the first service.

A method of manufacturing a system for managing services within a data storage subsystem during a startup sequence, comprising:

• providing a storage module operational in the data storage subsystem, wherein the storage module is adapted for:
• defining a first service facilitated by a provider, wherein the provider is operational on the data storage subsystem,
• linking at least one requirement to the first service,
• incorporating the first service and the at least one requirement into a specification file,
• constructing a directed acyclic graph interrelating the first service and a second service based on the at least one requirement, and
• traversing the directed acyclic graph using an initialization process to generate a determination which of an available plurality of services to provide;
• wherein:
• the determination further includes an analysis of the which of the available plurality of services to provide in view of at least one hardware resource in the data storage subsystem, and
• constructing the directed acyclic graph comprises interrelating the first service and the second service based on one of a weak requirement dependency and a strong requirement dependency of the first service and the second service, the weak requirement dependency comprising starting the second service after starting the first service and the strong requirement dependency comprising starting the second service prior to starting the first service.