Building control system having fault tolerant clients
First Claim
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1. ) A fault tolerant building control system comprising:
- a database server for storing information about the building control system;
one or more clients, each client provided for monitoring and controlling a building control subsystem, wherein said client is provided with a database for storing data about the building subsystem from the database server such that the client will be able to continue monitoring and controlling said building subsystem if said client becomes operatively disconnected from said database server such that said client becomes a fault tolerant server.
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Abstract
A building control system is provided with one or more clients which are converted to become fault tolerant servers by replicating system data into the clients. The fault tolerant servers may be grouped with one or more clients each such that fault tolerant servers and associated clients function as groups when communications between the database server of the building control system and the fault tolerant server and the clients are interrupted. In this way, the fault tolerant server and the clients can continue functioning when disconnected from the database server.
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Citations
20 Claims
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1. ) A fault tolerant building control system comprising:
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a database server for storing information about the building control system;
one or more clients, each client provided for monitoring and controlling a building control subsystem, wherein said client is provided with a database for storing data about the building subsystem from the database server such that the client will be able to continue monitoring and controlling said building subsystem if said client becomes operatively disconnected from said database server such that said client becomes a fault tolerant server. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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- 2. ) The system according to claim 2, wherein the information shared with each fault tolerant server includes information about the subnetwork the fault tolerant server is connected to.
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3. ) The system according to claim 3, wherein the subnetwork is a building level network.
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17. ) A method of converting a server dependant client to a fault-tolerant server comprising, wherein said server dependant client is operatively connected to a database server, said database server having system information necessary for the system to operate, the method comprising:
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determining which databases in said databases server need to be replicated into client such that said client can operate as a fault-tolerant server;
determining available disk space for said client;
establishing appropriate partitions in the database of the client;
replicating databases from said database server into said fault tolerant server database, said databases including information about one or more clients grouped with the fault tolerant server such that the fault tolerant server and the fault tolerant clients can communicate when the clients and the fault tolerant server are unable to communicate with the database server;
establishing weights on each database; and
starting the lockserver transferred to the fault-tolerant server - View Dependent Claims (18, 19, 20)
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Specification