US5544347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage system controlled remote data mirroring with respectively maintained data indices
Assignee: EMC Corp
•
Filing: 1993-04-23
•
Granted: 1996-08-06
•
Expires: 2013-04-23
Abstract
Abstract A data storage system which automatically provides and maintains identical secondary data on a preferably geographically remote secondary data storage device. The system includes a primary host computer located in the first geographic location which is coupled to a primary data storage system also located in the first geographic location. The primary data storage system includes at least one primary data storage device on which primary data is to be stored, and a primary data storage system controller which receives data from the primary host computer and controls the storing of the primary data on the primary data storage device. The primary data storage controller is coupled by high speed communication link to a secondary data storage system controller of a secondary data storage system, and coordinates the copying of the primary data to the secondary data storing system, and is responsive to an acknowledgement from the secondary data storage system controller of at least successful receipt of the primary data for updating the maintained list of the primary data to indicate that the copied primary data has been received by the secondary data storage system to be copied to the secondary data storage device.
Inventors
- 👤 Moshe Yanai
- 👤 Natan Vishlitzky
- 👤 Bruno Alterescu
- 👤 Daniel Castel
- 👤 Gadi Shklarsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:51
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; G06F11/2053; G06F11/2056; G06F11/2071; G06F11/2066; G06F11/2074; G06F11/2079; G06F11/2082; G06F3/00; G06F3/06; G06F3/0601; G06F3/0602; G06F3/0608; G06F3/061; G06F3/0614; G06F3/0619; G06F3/0628; G06F3/0638; G06F3/064; G06F3/0646; G06F3/0647; G06F3/065; G06F3/0655; G06F3/0661; G06F3/0668; G06F3/067; G06F3/0671; G06F3/0683; G06F3/0689; H; H04; H04L; H04L67/00; H04L67/01; H04L67/10; H04L67/1095; H04L69/00; H04L69/40; H04L9/00; H04L9/40; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; H04L69/26; Y; Y10; Y10S; Y10S707/00; Y10S707/99941; Y10S707/99942
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
198 words
A system for automatically providing and maintaining data, said system comprising: a host computer located in a first geographic location; a first data storage system located in a first geographic location and coupled to said host computer, for storing data to be accessed by at least said host computer; a second data storage system located in a second geographic location geographically remote from said first location, coupled to said first data storage system, for receiving at least data from said first data storage system; and said first data storage system enabling transfer of said data to said second data storage system, concurrently with said data received from said host computer, so as to nearly simultaneously maintain a concurrent copy of data stored on said first data storage system and on said second data storage system wherein both said first and said second data storage systems maintain an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, and at least a second indicator providing an indication of whether said predetermined data element stored on said second data storage system is valid.
Claim 2
Independent Claim
198 words
A system for automatically providing and maintaining data, said system comprising: a host computer located in a first geographic location; a first data storage system located in a first geographic location and coupled to said host computer, for storing data to be accessed by at least said host computer; a second data storage system located in a second geographic location geographically remote from said first location, coupled to said first data storage system, for receiving at least data from said first data storage system; and said first data storage system enabling transfer of said data to said second data storage system, concurrently with said data received from said host computer, so as to nearly simultaneously maintain a concurrent copy of data stored on said first data storage system and on said second data storage system wherein both said first and said second data storage systems maintain an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, and at least a second indicator providing an indication of whether said predetermined data element stored on said second data storage system is valid.
Claim 3
Dependent Claim
25 words
The system of claim 1, wherein said first data storage system and said second data storage system are coupled by a high speed communication link.
Claim 4
Dependent Claim
28 words
The system of claim 1, wherein said second data storage system provides an acknowledgment after said data has been received and stored on said secondary data storage system.
Claim 5
Dependent Claim
87 words
The system of claim 1, further including a second host computer, located in said second geographic location geographically remote from said first location, and coupled to at least said second data storage system, for storing a second quantity of data to be accessed by at least said second host computer, and for at least retrieving said data stored on said second data storage system and copied from said data on said first data storage system upon failure of said first host and said first data storage system.
Claim 6
Dependent Claim
33 words
The system of claim 1, wherein said second data storage system maintains an index of at least data which has yet to be copied to said second data storage system as secondary data.
Claim 7
Dependent Claim
20 words
The system of claim 5, wherein said first and said second data storage systems maintain said index in semi-conductor memory.
Claim 8
Dependent Claim
27 words
The system of claim 5, wherein said first and said second data storage systems maintain said index in said first and said second data storage system respectively.
Claim 9
Dependent Claim
54 words
The system of claim 5, wherein said maintained index includes at least a list of data which must be copied from said first data storage storage to said second storage system and, a list of data storage device storage locations for which a format command is pending and for which an invalid track exists.
Claim 10
Dependent Claim
59 words
The system of claim 1 wherein said first indicator provides an indication of whether data stored in a predetermined data element storage location on said first data storage system is valid, and wherein said second indicator provides an indication of whether corresponding data stored in a corresponding data element storage location on said second data storage system is valid.
Claim 11
Independent Claim
175 words
A system for automatically providing and maintaining data, said system comprising: a host computer; a first data storage system including at least a first data storage system controller and at least one data storage device, said first data storage system coupled to said host computer, for storing data to be accessed by at least said host computer; a second data storage system including at least a second data storage system controller and at least one data storage device, said second data storage system remotely coupled to said first data storage system; and said first data storage system controller coordinating and controlling concurrent copying of said data to said second data storage system controller wherein both said first and said second data storage systems maintain an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, and at least a second indicator providing an indication of whether said predetermined data element stored said second data storage system is valid.
Claim 12
Independent Claim
175 words
A system for automatically providing and maintaining data, said system comprising: a host computer; a first data storage system including at least a first data storage system controller and at least one data storage device, said first data storage system coupled to said host computer, for storing data to be accessed by at least said host computer; a second data storage system including at least a second data storage system controller and at least one data storage device, said second data storage system remotely coupled to said first data storage system; and said first data storage system controller coordinating and controlling concurrent copying of said data to said second data storage system controller wherein both said first and said second data storage systems maintain an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, and at least a second indicator providing an indication of whether said predetermined data element stored said second data storage system is valid.
Claim 13
Dependent Claim
57 words
The system of claim 10 wherein said first indicator provides an indication of whether data stored in a predetermined data element storage location on said first data storage system is valid, and second indicator provides an indication of whether corresponding data stored in a corresponding data element storage location on said second data storage system is valid.
Claim 14
Independent Claim
217 words
A system for automatically providing and maintaining data, said system comprising: at least one host computer located in a first location; a first data storage system including a first data storage system controller and at least one data storage device, said first data storage system located in a first location and coupled to said host computer, for storing data to be accessed by at least said host computer; a second data storage system including a second data storage system controller and at least one data storage device, said second data storage system located in a second location which is geographically remote from said first data storage system; and said first data storage system controller of said first data storage system and said second data storage system controller of said second data storage system for coordinating and controlling concurrent copying of said data from said first data storage system to said second data storage system wherein both said first and said second data storage systems maintain an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, and at least a second indicator providing an indication of whether said predetermined data element stored on said second data storage system is valid.
Claim 15
Independent Claim
217 words
A system for automatically providing and maintaining data, said system comprising: at least one host computer located in a first location; a first data storage system including a first data storage system controller and at least one data storage device, said first data storage system located in a first location and coupled to said host computer, for storing data to be accessed by at least said host computer; a second data storage system including a second data storage system controller and at least one data storage device, said second data storage system located in a second location which is geographically remote from said first data storage system; and said first data storage system controller of said first data storage system and said second data storage system controller of said second data storage system for coordinating and controlling concurrent copying of said data from said first data storage system to said second data storage system wherein both said first and said second data storage systems maintain an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, and at least a second indicator providing an indication of whether said predetermined data element stored on said second data storage system is valid.
Claim 16
Dependent Claim
56 words
The system of claim 12 wherein first indicator provides an indication of whether data stored in a predetermined data element storage location on said first data storage system is valid, and second indicator provides an indication of whether corresponding data stored in a corresponding data element storage location on said second data storage system is valid.
References Cited (Backward Citations)
US3866182A
Cited
US3588839A
Cited
US3835260A
Cited
US4020466A
Cited
US4057849A
Cited
US4150429A
Cited
US4161777A
Cited
US4084231A
Cited
US4094000A
Cited
US4124843A
Cited
US4204251A
Cited
US4342079A
Cited
GB2086625A
Cited
JPS57111900A
Cited
US4396984A
Cited
US4464713A
Cited
US4453215A
Cited
US4430727A
Cited
US4577272A
Cited
US4634110A
Cited
WO1985002926A1
Cited
US4755928A
Cited
US4916605A
Cited
US4805106A
Cited
US4698808A
Cited
US4779189A
Cited
US4710870A
Cited
EP0239323A2
Cited
US4797750A
Cited
US4814592A
Cited
US4769764A
Cited
US4783834A
Cited
US4862411A
Cited
US4785472A
Cited
US4849978A
Cited
JPS6419437A
Cited
JPS6419438A
Cited
US5123099A
Cited
US5132787A
Cited
US5051887A
Cited
US4837680A
Cited
US5099485A
Cited
JPH01120650A
Cited
US5146605A
Cited
EP0323123A2
Cited
US5175839A
Cited
US5313664A
Cited
US5060185A
Cited
US5134711A
Cited
JPH0232419A
Cited
JPH0232420A
Cited
JPH0232418A
Cited
US5159671A
Cited
JPH0291716A
Cited
JPH0293721A
Cited
JPH0291717A
Cited
US5007053A
Cited
US4949187A
Cited
US5089958A
Cited
US5170471A
Cited
US5185864A
Cited
US5202887A
Cited
US4985695A
Cited
US5029199A
Cited
US5097439A
Cited
US5274645A
Cited
US5127048A
Cited
US5155845A
Cited
US5155814A
Cited
US5157770A
Cited
US5201053A
Cited
US5146576A
Cited
US5235692A
Cited
US5235690A
Cited
US5446872A
Cited
US5343477A
Cited
US5155835A
Cited
US5239659A
Cited
US5459857A
Cited
WO1994000816A1
Cited
US5428796A
Cited
US5463752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |