Patent 5742792 Issued on April 21, 1998. Estimated Expiration Date: May 28, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
711/162, Backup710/1, INPUT/OUTPUT DATA PROCESSING711/161, Archiving711/165, Internal relocation714/5, Of memory or peripheral subsystem714/6, Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)714/710, Replacement of memory spare location, portion, or segment714/718, Memory testing714/763Memory access
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a remotely mirrored volume pair. Normally, a host computer directly accesses either a local or a primary volume, and data written to a primary volume is automatically sent over the link to a corresponding secondary volume. Each remotely mirrored volume pair can operate in a selected synchronization mode including synchronous, semi-synchronous, adaptive copy - remote write pending, and adaptive copy - disk. Direct write access to a secondary volume is denied if a "sync required" attribute is set for the volume and the volume is not synchronized. If a "volume domino" mode is enabled for a remotely mirrored volume pair, access to a volume of the pair is denied when the other volume is inaccessible. In a "links domino" mode, access to all remotely mirrored volumes is denied when remote mirroring is disrupted by an all-links failure. The domino modes can be used to initiate application-based recovery, for example, recovering a secondary data file using a secondary log file. In an active migration mode, host processing of a primary volume is concurrent with migration to a secondary volume. In an overwrite cache mode, remote write-pending data in cache can be overwritten. Write data for an entire host channel command word chain is bundled in one link transmission.
D.L. Burkes & R.K. Treiber, "Design Approaches for Real-Time Transaction Processing Remote Site Recovery," Computer Society International Conference (COMPCON), Spring Meeting, Los Alamitos, Feb. 26-Mar. 2, 1990, No., CONF. 35, 23 Feb. 1990, Institute of Electrical and Electronics Engineers, New York, N.Y., pp. 568-572
Supplementary European Search Report for EP 94 91 4223, Jul. 1, 1997
International Search Report for PCT/US/94/04326, Jul. 20, 1994
PCT Written Opinion for PCT/US94/04326, 28 Feb. 1995
PCT International Preliminary Examination Report for PCT/US94/04326, Jul. 18, 1995
Hank Cote-New Horizons in Accessing Large Amounts of On-Line Data, pp. 71-75, 1982
Matt Kramer-Fault-Tolerant LANs Guard Against Malfunction, Data Loss, pp. C26-C35, Sep. 1987
Carol Grossman-Planning for 3990 Extended Functions, pp. 245-258, 1989, 30th Annual GUIDE Conference
Bob Buchanan-Administrative Error Causes Most Major System Failures (3 pgs.), Feb. 1988, Goverment Computer News, V. 17, N. 4, p. 340
Virginia Dudek-Planning for Network Disasters (4 pgs.), Jun. 12, 1989, MIS Week, vol. 10, N. 24
Jean Bozman-Escon An Aid To Remote Disks (3 pgs.), V. 25, N. 1, p. 29, Jan. 7, 1991
Gary A. Boles-A RAID Stack: Micropolis RAIDION, Network Computer, Jun. 1992
Blaine Homer-RAID Level 5 Protects Your Data With Interleaved Parity, LAN Times, May 25, 1992, vol. 9
Michael Caton-Micropolis Array Secures Data, PC Week, 1992
RAIDON Fault-Tolerant Disk Arrays Brochure, 1993
Storagetek 2Q Earnings Down, Iceberg Ready for Testing by Jim Mallory, Newsbytes, Jul. 15, 1993
Network Backup Evolves, by Michael Peterson et al., PC Magazine, vol. 12, No. 16, Sep. 28, 1993, p. 277(18)
Your Next LAN Storage Could Be a Mainframe, Jeff Moad, Datamination, vol. 39, No. 6, Mar. 15, 1993, p. 71
Heard Any Good Rumors Lately? (Network Management), By Jill Huntington-Lee, LAN Computing, vol. 5, No. 2, Feb. 1994, p. 22
Special Report: The AT&T Worldwide Intelligent Network-Scope, Nature and Management, Edge, vol. 7, No. 224, Nov. 6, 1992, p. 9
Protect Your Data| (Database Report), by Michael Liczbanski, Data Based Advisor, vol. 10, No. 5, May 1992, p. 114
Network Planning to the Rescue; Network Managers Should Design and Test a Network Recovery Plan That Lets Business Continue Uninterrupted Even If Disaster Strikes, by Ramond W. Rudnitskas et al., Networking Management, vol. 9, No. 11, Oct. 1991, p. 46
If LANS Eye Host Status, Quality Today Falls Short, by Barbara Bochenski, Software Magazine, vol. 11, No. 12, Oct. 1991, p. 66
Safe and Secure, by Peter Stephenson, LAN Magazine, vol. 6, No. 9, Sep. 1991, p. 34
Firing Up Fault Tolerance by Brian O'Connell, DEC Professional, vol. 10, No. 6, Jun. 1991, p. 118
A Which Computer? Guide to Backup Systems, by Chris Bidmead, Which Computer?, Sep. 1989, p. 62
Optical Disks Compete With Videotape and Magnetic Storage Media, by Henry Urrows et al., Optical Information Systems, vol. 8, No. 3, May-Jun. 1988, p. 101
Preventing Disasters: Whipping Up an Emergency Response Plan, Network Computing, Feb. 1992, p. 81
Abbey Banking on FDDI, Communications Week International, Mar. 4, 1991, p. 22
X.25 Data Networks and IBM: A Troublesome Connection, by Jan Johnson, Computer Decisions, vol. 19, Jan. 12, 1987, p. 16
DSC Communications Corp. Debuts NEXOS LAN Product Line at Interface, Demos Enhanced Performance, Fault Tolerance and WAN Connectivity, News Release, Mar. 28, 1988
Analysis of Scanning Policies For Reducing Disk Seek Times, by E. G. Coffman, L. A. Klimko and Barbara Ryan-Siam, Journal on Computing, Sep. 1972, vol. 1, No. 3, pp. 269-280
Configuring Tandem Disk Subsystems, by Scott Sitler, Tandem Systems Review, Dec. 1986, pp. 80-91
Technical Report Investigation of Selected Disk Systems, Oct. 1976, Teledyne Brown Engineering, Huntsville, Alabama (18 pages)
Software Extends Unix Distributed Computing, by Evan O. Grossman, PC Week, Jun. 5, 1989, p. 35 and p. 40
IBM Funds Pack Firm, Electronic News, May 22, 1989, p. 12
IBM Plans U.S. Test of File-Transfer, Network World, Sep. 5, 1988, pp. 15, 17
IBM Invests In Firm That Offers Unix File-Sharing, Network World, May 22, 1989, p. 4
IBM Plans Speedy Nationwide File System, Computer Systems News, Sep. 5, 1988, p. 56
Design Alternatives for Disk Duplexing, by Spencer W. Ng, IBM Research Report, Jan. 30,1987
Disk Arm Movement In Anticipation of Future Requests, by Richard P. King, IBM Research Report, Dec. 16, 1987
Ubik: Replicated Servers Made Easy, by Michael Leon Kazar, pp. 60-67, 1989
Carnegie-Mellon Forges Standard Look For Multivendor Net, Computerworld, Jan. 30, 1989, pp. SR/8-SR/9
A Multi-Media Message System For Andrew, USENIX Winter Conference, Feb. 9-12, 1988, pp. 37-42
Synchronization and Caching Issues in the Andrew File System, USENIX Winter Conference, Feb. 9-12, 1988, pp. 27-36
Comparative Study of Some UNIX Distributed File Systems, EUUG, Sep. 22-24, 1986, pp. 73-82
VOLUMES-The Andrew File System Data Structuring Primitive, EUUG Autumn 1986, Sep. 22-24, 1986, pp. 473-480
Unix Plays Role in Corporate Networking, MIS Week, vol. 10, No. 28, Jul. 17, 1989, pp. 22-23
Sun's Open System Made by Marketplace, "Unlike Minis, Unix Machines, Pcs and Even VMS Can Be Glued" by NFS, Software Magazine, vol. 9, No. 12, Oct. 1989, pp. 72-75, Cashin, Jerry
Universal Server Under Development, MacWEEK, vol. 3, No. 39, Oct. 31, 1989, p. 5
Unix Plays Role In Corporate Networking-Vendors Look Unix-Based Network Management Tools as Networking Standards Slowly Evolve, MIS Week, Jul. 17, 1989, pp. 22-23, vol. 10, No. 28
The 28 Runners Declared for Open Software Foundations, Distributed Computing Stakes, Computergram International, No. 1301, CGI11909912, Nov. 9, 1989
Some Platforms (Theory of Self-Organizing Systems), Release 1.0, vol. 89, No. 6, Jun. 27, 1989, pp. 12-16
Self-Organizing Systems (Overview of Detailed Examples of Self-Organizing Systems, Includes related article About the Importance of Self-Organizing Systems), Release 1.0, vol. 89, No. 6, Jun. 27, 1989, pp. 1-9
IBM-Funded Startup Developing Unix Add-On, PC Week, vol. 6, No. 22, Jun. 5, 1989, p. 40
Uniting File Systems; Experimental Large Scale, Distributed File Systems Are Now Being Created (included related article on the History of the AFS Project), UNIX Review, vol. 7, No. 3, Mar. 1989, pp. 61-70
IBM Backs Transarc, Formed to Offer Andrew File System Distributed Unix Database, Computergram International, No. 1180, CGI05190001, May 19, 1989
A Comparative Analysis of Disk Scheduling Policies, by Toby J. Reorey and Tad B. Pinerton, Communications of the ACM, Mar. 1972, vol. 15, No. 3, pp. 177-184
Disk Scheduling: FCFS vs. SSTF Revisited, by Micha Hofri, Communications of the ACM, Nov. 1980, vol. 23, No. 11, pp. 645-653
Using Multiple Replica Classes to Improve Performance in Distributed System, by Peter Triantafillou and David Tayloer, The 11th International Conference on Distributed Computing Systems, May 20-24, 1991, pp. 420-428
Government Computer News, Oct. 9, 1987, Richard A. Damca, Microcomputing "Patch Fault Tolerance: A Strong Second Team," vol. 7, Issue 149 P27(2), Dec. 17, 1990
Computer Reseller, Feb. 19, 1990, Joel Shore, Mirrored Servers' a reality, pp. 51, 52, 62
Infoworld Articles, Mar. 12, 1990, Vendors Offer Mirroring Solutions P(31)
Wilkinson, Compact and Novell team for fault tolerance: mirrored servers to cut down on costly downtime, Article MIS Week, vol. 11, Issue 7, Feb. 12, 1990
Article PC Week, vol. 4, Issue 37, Sep. 15, 1987, Matt Kramer, Fault-Tolerant LANS Guard Against Malfunction, Data Loss
"The DASD Time Bomb," Datamation, vol. 32, Mar. 1, 1986, P63(4), Alper, Alan
"Symmetrix Remote Data Facility Data Sheet, Symmetrix-resident Software Feature to extend mirroring capabilities," EMC Corporation, Hopkinton, Mass., Apr. 1995, 4 pages EMCP 00010741-10741!
"When Data is Lost in Minutes, its an Act of God. When Data is Recovered in Minutes, its an Act of EMC." EMC Corporation, Hopkinton, Mass., 1994, one page EMCP 00003903!
"EMC Ships Mainframe Disaster Recovery Solution that Restores Data in Minutes," News from EMC Corporation, EMC Corporation, Hopkinton, Mass., Oct. 3, 1994, two pages EMCP 00003921-3922!
"Asset Protection: Disk-Based Approach Makes Disaster Recovery More Efficient, Ensures Business Continuity," EMC Corporate Information, EMC Corporation, Hopkinton, Mass., 5 pages EMCP 00003916-3920!
"EMC Introduces Symmetrix 5500 Continuous Operation Disk Storage for Mission Critical IBM Mainframe Market," News from EMC Corporation, Hopkinton, Mass., Nov. 10, 1992, 3 pages
"MCI Deploys New Fast Data Transfer Technology from EMC," News from EMC Corporation, Hopkinton, Mass., May 22, 1995, 2 pages EMCP 00007520-7521!
"EMC Agreement with Data Switch to Promote Long Distance Disaster Recovery," News from EMC Corporation, EMC Corporation, Hopkinton, Mass., Nov. 30, 1994, 2 pages EMCP 00007516-7517!
"EMC and Comdisco to Benchmark Data Mirroring Capability," News from EMC Corporation, EMC Corporation, Hopkinton, Mass., Jan. 24, 1995, 2 pages EMCP 00007518-7519!
"EMC Ships Mainframe Disaster Recovery Solution that Restores Data in Minutes," News from EMC Corporation, EMC Corporation, Hopkinton, Mass., Oct. 3, 1994, 2 pages EMCP 00007514-7515!
N. S. Prasad, "IBM Mainframes: Architecture and Design," McGraw-Hill Book Company, New York, N.Y., 1989, pp. 58-73 and 182-196
"The IBM 3390 Storage Control Reference," No. GA32-0099-04, International Business Machines Corporation, Tucson, Arizona, 1991, pp. 1-304
Patterson et al., "A Case for Redundant Arrays of Inexpensive Disks (RAID)," Report No. UCB/CSD 87/391, Computer Science Division (EECS), University of California, Berkeley, California, Dec. 1987, pp. 1-24
Patterson et al., "Introduction to Redundant Arrays of Inexpensive Disks (RAID)," COMPCON 89 Proceedings, Feb. 27-Mar. 3, 1989, IEEE Computer Society, pp 112-117
Ousterhout et al., "Beating the I/O Bottleneck: A Case for Log-Structured File Systems," Operating Systems Review, vol. 23, No. 1, ACM Press, Jan., 1989, pp. 11-28
Douglis et al., "Log Structured File Systems," COMPCON 89 Proceedings, Feb. 27-Mar. 3, 1989, IEEE Computer Society, pp. 124-129
Rosemblum et al., "The Design and Implementation of a Log-Structured File System," ACM Transactions on Computer Systems, vol. 1, Feb. 1992, pp. 26-5
May 28, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
