Storage system employing universal timer for peer-to-peer asynch

Details Storage system employing universal timer for peer-to-peer asynch Storage system employing universal timer for peer-to-peer asynch

1998-07-09

2000-11-14

Yoo, Do Hyun

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

714 12, 714 20, G06F 1200

Patent

active

061483834

ABSTRACT:
A data storage system employs a universal timer to perform asynchronous peer-to-peer data mirroring, where primary and secondary controllers cooperatively perform periodic consistency checks according to the universal timer. The system includes multiple primary storage controllers each having a counterpart secondary controller. Primary and secondary controllers access a universal timer, such as a global positioning system (GPS). Each primary controller receives updates, and stores the updates in an order, providing each update with a sequence code according to its storage order. Each primary controller also transmits the updates and corresponding sequence codes to its secondary controller. Each secondary controller receives updates from its counterpart primary storage controller and stores the updates in a journal. Whenever a periodic timer interval of the universal timer expires, several things happen. Each primary controller sends its counterpart secondary controller a confirmation message useful in identifying all updates that were sent in the expired interval. Also, each secondary controller checks for receipt of the confirmation message, and if received, the secondary controller checks the journal for presence of all updates identified by the confirmation message. If each secondary controller finds all identified updates in its journal, all secondary controllers proceed to commit the journaled updates to secondary storage.

REFERENCES:
patent: 5416808 (1995-05-01), Witsaman et al.
patent: 5510797 (1996-04-01), Abraham et al.
patent: 5555371 (1996-09-01), Duyanovich et al.
patent: 5563607 (1996-10-01), Loomis et al.
patent: 5633872 (1997-05-01), Dinkins
R. Roze, "Using GPS for Timing ATM Networks," http://ucsub.colorado.edu/.about.roze/gps-atm.html, May 1, 1995, pp. 1-4.
E. Spivak, "Why Digital Networks Are Better with GPS Synchronizing", http://www.absolutetime.com/edspiv.about.1.htm, Aug. 28, 1997, pp. 1-7.

Affiliated with

Also associated with

Rating

Storage system employing universal timer for peer-to-peer asynch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Storage system employing universal timer for peer-to-peer asynch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Storage system employing universal timer for peer-to-peer asynch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2075896