Apparatus and method for increased data access in a network file object oriented caching system

• US 6,012,085 A
• Filed: 10/22/1997
• Issued: 01/04/2000
• Est. Priority Date: 11/30/1995
• Status: Expired due to Term

• Current Assignee: Comtech EF Data (Comtech Telecommunications Corporation)
• Original Assignee: Stampede Technologies, Inc. (Comtech Telecommunications Corporation)
• Inventors: Morris, Brian C., Yohe, Thomas Patrick, Hertzog, Scott, Penner, Jon J., Dorworth, Gordon L.
• Primary Examiner(s): Lim, Krisna
• Application Number:
  US08/956,190
• Time in Patent Office: 804 Days
• Field of Search: 709/203, 709/212, 709/216, 709/217, 709/218, 711/118, 711/130
• US Class Current: 709/217
• CPC Class Codes: G06T 9/00 Image coding bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 67/2876 Pairs of inter-processing entities at each side of the network, e.g. split proxies
• CPC Class Codes: H04L 67/564 Enhancement of application control based on intercepted application data
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 67/5682 Policies or rules for updating, deleting or replacing the stored data
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

An apparatus for increased data access in a network includes a file/object server computer having a permanent storage memory, a cache verifying computer operably connected to the file/object server computer in a manner to form a network for rapidly transferring data, the cache verifying computer having an operating system, a first memory and a processor capable of performing an operation on data stored in the permanent storage memory of the file/object server computer to produce a signature of the data characteristic of one of a file, an object and a directory, a remote client computer having an operating system, a first memory, a cache memory and a processor capable of performing an operation on data stored in the cache memory to produce a signature of the data, a communication server operably connected to the remote client computer to the cache verifying computer and the file/object server computer and comparators operably associated with the cache verifying computer and remote client computer for comparing the signatures of data with one another to determine whether the signature of data of the remote client is valid.

Claims

1. An apparatus for increased data access from data of the type including at least one of a file, an object and a directory in a file/object oriented network, which comprises:

a file/object server computer having an operating system, a first memory, a permanent storage memory and a processor;

a cache verifying computer operably connected to said file/object server computer in a manner to form a network for rapidly transferring data, said cache verifying computer having an operating system, a first memory and a processor with means for performing an operation on data stored in said permanent storage memory of said file server computer to produce a signature of said data;

a remote client computer having an operating system, a first memory, a cache memory and a processor with means for performing an operation on data stored in said cache memory to produce a signature of said data;

a communication server operably connecting to said remote client computer to said cache verifying computer and said file/object server computer; and

a first comparator operably associated with said cache verifying computer for comparing said signatures of data with one another to determine whether said signature of data of said remote client is valid.

2. The invention in accordance with claim 1, which includes a second comparator operably associated with said remote client computer for comparing said signatures of said data with one another to determine whether said signature of data of said remote client is valid.

3. The invention in accordance with claim 1, which further includes means operably associated with said remote client computer for filtering said data in a manner to preclude predetermined data from being manipulated from said cache memory of said remote client computer.

4. The invention in accordance with claim 1, which further includes means operably associated with said remote client computer for evaluating said object for presence in said cache memory of said remote client computer and determining said object as valid.

5. The invention in accordance with claim 1, which further includes means operably associated with said remote client computer and said cache verifying computer for replicating and synchronizing said data.

6. The invention in accordance with claim 5, which further includes means operably associated with said replicating and synchronizing means for compressing and decompressing said data.

7. The invention in accordance with claim 1, wherein said network file/object cacher includes means responsive to each said comparison performed by each said comparator on said data for generating and storing a validation ratio for said data in a third memory and for removing said data from said cache memory when said validation ratio drops below a predetermined value.

8. The invention in accordance with claim 7, wherein said storing and removing means is further defined to preclude said data having a validation ration less than said predetermined value from reentering said cache memory.

9. The invention according to claim 1, wherein said cache verifying computer includes means for recognizing a LOCK request from said remote client computer and for obtaining a lock on said data from said file server computer in response to said LOCK request.

10. The invention in accordance with claim 9, wherein said LOCK recognizing means is further defined as a proxy for said remote client computer for allowing one of a subsequent READ/WRITE request and GET-OBJECT request to occur on behalf of said remote client.

11. The invention in accordance with claim 1, wherein said first memory of said remote client computer is disposed in a RAM of said remote client computer, said first memory of said cache verifying computer is disposed in a RAM of said cache verifying computer, said first memory of said file/object server computer is disposed in a RAM of said file/object server computer and said permanent storage memory is disposed on a permanent storage disk of said file/object server computer and said cache memory is disposed on a permanent storage disk of said remote client computer.

12. The invention in accordance with claim 1, wherein said cache verifying computer has said communications server integrally formed therewith.

13. A method, performed by computers in a file/object oriented network for increased speed of access of data, which comprises:

using a file/object server computer having an operating system, a first memory, a permanent storage memory and a processor;

using a cache verifying computer operably connected to said file/object server computer in a manner to form a network for rapidly transferring data, said cache verifying computer having an operating system, a first memory and a processor;

using a remote client computer having an operating system, a first memory, a cache memory and a processor;

using a communication server operably connected to said remote client computer to said cache verifying computer and said file/object server computer;

establishing a processor element in said cache verifying computer which recognizes at least one of a READ REQUEST, a GET-OBJECT REQUEST and a DIRECTORY REQUEST by said remote client computer and obtains said data from said file/object server computer associated with one of a file, an object and a directory and generates a signature of said data associated with of one of said file, said object and said directory;

establishing a processor element on said remote client computer which initiates upon one of a READ REQUEST, a GET-OBJECT REQUEST and a DIRECTORY REQUEST from the cache memory to generate a signature of said data associated with of one of said file, said object and said directory;

using a first comparator operably associated with said cache verifying computer for comparing said signatures of data of said file with one another to determine whether said signature of data of the file of said remote client is valid.

14. The method of the invention in accordance with claim 13, which further includes the steps of using a second comparator operably associated with said remote client computer for comparing said signatures of data of said directory with one another to determine whether said signature of data of said directory of said remote client is valid.

15. The method of the invention in accordance with claim 13, which further includes the steps of using a third comparator operably associated with said remote client computer for comparing said signatures of data of said object with one another to determine whether said signature of data of said object of said remote client is valid.

16. The method of the invention in accordance with claim 13, which further includes the steps of:

establishing in said remote client computer a processor element responsive to each comparison of said signature data;

generating a validation ratio for said data;

storing said validation ratio in a third memory of said remote client computer; and

removing said data from said cache memory when said validation ratio drops below a predetermined value.

17. The method of the invention in accordance with claim 16, wherein the step of removing is further characterized to induce preventing said data from reentering said cache memory.

18. The method of the invention in accordance with claim 13, which further includes the steps of:

establishing in said cache verifying computer a processor element responsive to each said LOCK request from said remote client computer; and

obtaining a lock on said data from said file/object server computer in response to said LOCK request.

19. The method of the invention in accordance with claim 18, which further includes the steps of establishing in said verifying computer a processor element responsive to each said READ/WRITE request from said remote client computer, and performing said READ/WRITE request on behalf of said remote client computer.