Micron Technology Incorporated

Micron Electronics, Inc.

Bruce Findlay

Michael Patrick Chrabaszcz

Walter August Wallach

Thomas J Pellicer

A method of monitoring a status condition of a first server with a second server in a server network, and also providing synchronization and messaging between the two servers, the method including: transmitting a software-generated pulse waveform from the first server to a device coupled to the first server, wherein the software-generated pulse waveform is comprises a first command corresponding to a logic level low and a second command corresponding to a logic level high; setting said device to a first state during logic level lows of said pulse waveform and to a second state during logic level highs of said pulse waveform; receiving the software-generated pulse waveform with the second server by determining when said device is in the first state and when it is in the second state; and determining when said device no longer changes from the first state to the second state. In order to provide synchronization and messaging, said pulse waveform is frequency modulated in order to communicate specified commands and/or reference points between the two servers.

System and method for communicating a software-generated pulse waveform between two servers in a network

Method for communicating a software-generated pulse waveform between two servers in a network

The method of the current invention provides a fault tolerant access to a network resource. A replicated network directory database operates in conjunction with server resident processes to remap a network resource in the event of a server failure. The records/objects in the replicated database contain for each network resource, a primary and a secondary server affiliation. Initially, all users access a network resource through the server identified in the replicated database as being the primary server for the network resource. When server resident processes detect a failure of the primary server, the replicated database is updated to reflect the failure of the primary server, and to change the affiliation of the network resource from its primary to its backup server. This remapping occurs transparently to whichever user/client is accessing the network resource. As a result of the remapping, all users access the network resource through the server identified in the replicated database as the backup server for the resource. When the server resident processes detect a return to service of the primary server, the replicated database is again updated to reflect the resumed operation of the primary server. This remapping of network resource affiliations also occurs transparently to whichever user/client is accessing the network resource, and returns the resource to its original fault tolerant state.

Method for providing a fault tolerant network using distributed server processes to remap clustered network resources to other servers during server failure

A system for monitoring the status of a first server in a server network with a second server in the network, and also for providing synchronization and messaging capability between the two servers, the system including: a device coupled to first and second servers for receiving commands from the first and second server; a pulse transmitter module, coupled to the first server, for transmitting a software-generated pulse waveform to said device; and a pulse receiver module, coupled to the second server, for receiving the software-generated pulse waveform, wherein the software-generated pulse includes: a first command transmitted from the first server to said device which corresponds to a logic level low of said pulse waveform, wherein the first command sets the status condition of said device to a first state; and a second command transmitted from the first server to said device which corresponds to a logic level high of said pulse waveform, wherein the second command sets the status condition of said device to a second state. In order to provide synchronization and messaging, specified commands and/or reference points between the two servers.

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Palo Alto, CA, United States of America

Bruce Findlay