What Is Gab, Llt And Had And What's Their Functionalities ?

1.	What Is Gab, Llt And Had And What's Their Functionalities ?
Answer» GAB, LLT and HAD forms the basic building blocks of vcs functionality: LLT (low latency transport protocol) – LLT transmits the HEARTBEATS over the interconnects. It is also used to distribute the inter system communication traffic EQUALLY among all the interconnects. GAB (Group membership services and atomic broadcast) – The group membership service part of GAB maintains the overall cluster membership information by TRACKING the heartbeats sent over LLT interconnects. The atomic broadcast of cluster membership ensures that every node in the cluster has same information about every resource and service group in the cluster. HAD (High Availability daemon) – the main VCS engine which manages the AGENTS and service group. It is in turn monitored by a daemon named hashadow. GAB, LLT and HAD forms the basic building blocks of vcs functionality:

Answer»

GAB, LLT and HAD forms the basic building blocks of vcs functionality:

LLT (low latency transport protocol) – LLT transmits the HEARTBEATS over the interconnects. It is also used to distribute the inter system communication traffic EQUALLY among all the interconnects.
GAB (Group membership services and atomic broadcast) – The group membership service part of GAB maintains the overall cluster membership information by TRACKING the heartbeats sent over LLT interconnects. The atomic broadcast of cluster membership ensures that every node in the cluster has same information about every resource and service group in the cluster.
HAD (High Availability daemon) – the main VCS engine which manages the AGENTS and service group. It is in turn monitored by a daemon named hashadow.

GAB, LLT and HAD forms the basic building blocks of vcs functionality:

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