The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 1998
Filed:
Sep. 26, 1994
Ying-King Yu, Sunnyvale, CA (US);
Acer America Corporation, San Jose, CA (US);
Abstract
The present invention provides methods for mirroring hard disk data of a primary server over a network to a secondary server. A virtual disk driver is provided between the operating system and the hard disk driver of the primary server. After the virtual disk driver receives a disk write request that should be mirrored, the virtual disk driver first sends a disk write request to the secondary server. The virtual disk driver then sends the disk write request to a disk drive on the primary server. In the event data residing on one server is unavailable due to a system failure, the same data would still be available on the other server. Multiple methods of synchronous and asynchronous disk mirroring are provided. The present invention provides a very low overhead and results in high performance and availability.