Management packs to scom agent server ?

Question

How SCOM agent will get Management Packs from Management server ? Will all Management Packs will get downloaded to all SCOM agent server?
Or how does Management server will come to know only required Management Packs
 for agent server? (I heard Management Server  will scan the registry to of agent server to understand the application and requirement , then it sent Management Packs
 for agent server , is that correct ? )

Answer 1

On import, a complex and expensive series of operations occur.
The MP is written to a table.
The MP is loaded by the config service and all discovery targets are examined
A list of agents is created based on whether the agent manages a type instance that is a target of a discovery in each new MP.  When this is found to be a match, the config service marks the agent config as stale in memory.
The agent periodically contacts the RMS (config service).  In the response, a "you are stale" flag is included.  THis causes the agent to ask for a resynchronization.
The agent gets a response with all of the state for every type instance being managed, as well as a list of mps and versions and indicators of whether the agents copy of these is stale.
The agent then requests any files it needs and receives them (this is expensive)
The agent then loads each MP, replacing any workflows that are necessary, and starts normal agent processing (discoveries run immediately - this is expensive).
Agent submits new discovery data.  The config service responds with data indicating what the official state of each managed instance sent in the discovery is. (this is expensive)
Each time you create an override and save it, the above is repeated. (this is why it is slow to make online overrides)
Roger