05987621 is referenced by 228 patents and cites 74 patents.

A file server includes stream server computers linking a cached disk array storage subsystem to a data network, and at least two controller servers for receiving requests for file access from network clients. At any given time one of the controller servers is active and another is inactive in servicing client requests. The active controller server selects one of the stream servers to service each request. A controller server failover mechanism is provided for recovering from a failure of the active controller server, and a stream server failover mechanism is provided for recovering from a failure of a stream server. The inactive controller server becomes active when it fails to receive a signal periodically transmitted by the active controller server. The active controller server begins stream server failover when it fails to receive a signal periodically transmitted by each stream server. To resume automatically an interrupted task, the tasks are organized as a series of transactions, and each transaction includes operations which can be duplicated without substantial disruption. The active controller server commits results of each transaction to memory of the cached disk array. Before becoming active, the inactive controller recovers the committed state of the interrupted tasks from the cached disk array.

Title
Hardware and software failover services for a file server
Application Number
8/851507
Publication Number
5987621
Application Date
May 5, 1997
Publication Date
November 16, 1999
Inventor
Dennis P J Ting
Groton
MA, US
Uresh K Vahalia
Newton
MA, US
Uday Gupta
Westford
MA, US
John Forecast
Newton
MA, US
Wayne W Duso
Shrewsbury
MA, US
Agent
Arnold White & Durkee
Assignee
EMC Corporation
MA, US
IPC
H04N 7/173
View Original Source