File system for creating switched logical I/O paths for...

Details File system for creating switched logical I/O paths for... File system for creating switched logical I/O paths for...

2006-10-31

2006-10-31

Coby, Frantz (Department: 2165)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

07130868

ABSTRACT:
In a system of the present invention in which a file ID is defined for each file, upon receiving a request for accessing a file specifying a file ID from a user, a file server refers to a file management table to obtain a logical disk ID for accessing the file. The file server then refers to a logical disk management table to obtain an I/O path corresponding to the logical disk ID, and accesses a physical disk device by use of the obtained I/O path. When a fault has occurred in an operational I/O path, a file server rewrites the logical disk management tables in all nodes to change the I/O path. This reduces the time taken to switch I/O paths, and hiding the process of switching the I/O paths from the user.

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BACH “Internal Representation of Files,” The Design of the Unix Operating System Publisher Prentice-Hall, Inc. Upper Saddle River, NJ, USA pp. 60-72 (1986).

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