Minimizing system downtime through intelligent data caching in an appliance-based business continuance architecture

• US 7,266,656 B2
• Filed: 04/28/2004
• Issued: 09/04/2007
• Est. Priority Date: 04/28/2004
• Status: Expired due to Fees

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: International Business Machines Corporation
• Inventors: Gill, Binny Sher, Chen, Ying, Huang, Lan
• Primary Examiner(s): Sough; Hyung
• Assistant Examiner(s): AHMED, HAMDY S
• Application Number:
  US10/835,299
• Publication Number:
  US 20050246575A1
• Time in Patent Office: 1,224 Days
• Field of Search: 711/162
• US Class Current: 711/162
• CPC Class Codes: G06F 11/2069 Management of state, configuration or failover
• CPC Class Codes: G06F 11/2076 Synchronous techniques
• CPC Class Codes: Y10S 707/99953 Recoverability

Abstract

A system for minimizing downtime in an appliance-based business continuance architecture is provided. The system includes at least one primary data storage and least one primary host machine. The system includes an intercept agent to intercept primary host machine data requests, and to collect information associated with the intercepted data requests. Moreover, at least one business continuance appliance in communication with the primary host machine and in communication with a remote backup site is provided. The appliance receives information associated with the intercepted data requests from the intercept agent. In addition, a local cache is included within the business continuance appliance. The local cache maintains copies of primary data storage according to the information received. Furthermore, the remote site is provided with the intercepted data requests via the business continuance appliance, wherein the remote site maintains a backup of the primary data storage.

Claims

1. A system for minimizing downtime in an appliance-based business continuance architecture, comprising:

at least one primary data storage;

at least one primary host machine, wherein the primary host machine can access data stored at the primary data storage;

an intercept agent at the primary host machine to intercept data requests made to the host machine and to collect access patterns and statistics associated with the intercepted data requests, wherein the intercepted data requests include data read requests and data write requests;

at least one business continuance appliance in communication with the intercept agent at the primary host machine and in communication with a remote backup site, wherein the business continuance appliance receives information associated with the intercepted data requests from the intercept agent;

a local cache included within the business continuance appliance, wherein the local cache maintains copies of data associated the intercepted data requests, wherein the copies are maintained according to the access patterns and statistics received; and

the remote backup site to be provided with the intercepted data requests via the business continuance appliance, wherein the remote backup site maintains a secondary copy of the data located at the primary data storage,

whereby the data maintained by the local cache is utilized to provide a backup copy of data in the event of the primary site failing, without resorting to access of the remote backup site.

2. The system of claim 1 wherein the business continuance appliance includes a staging agent, wherein the staging agent handles the receiving of the information associated with the intercepted data requests from the intercept agent, the received information includes:

the intercepted data requests;

data associated with the intercepted data request, when the intercepted data requests comprise requests to update data at the primary storage; and

the access patterns and statistics collected by the intercept agent.

3. The system of claim 2 wherein the staging agent forwards the information received from the intercept agent to the remote backup site.

4. The system of claim 2 wherein the staging agent is responsible for maintaining the local cache copies of the data associated with the intercepted data requests, wherein the staging agent utilizes the access patterns and statistics received to determine which copies of the data are to be maintained and to determine at what location within the local cache the copies of the data are to be stored.

5. The system of claim 4 further comprises utilizing a cache replacement algorithm to determine which copies of the data are to be maintained and to determine at what location within the local cache the copies of the data are to be stored.

6. The system of claim 1 wherein the local cache comprises at least one disk drive.

7. The system of claim 1 wherein the local cache comprises a RAM.

8. The system of claim 1 wherein the remote backup site includes a backup agent, wherein the backup agent receives information associated with the intercepted data requests from the business continuance appliance, the received information associated with the intercepted data requests including:

the collected access patterns and statistics;

data associated with data update requests; and

new data, wherein new data includes data written to the primary storage for the first time.

9. The system of claim 8 wherein the backup agent utilizes the collected access patterns and statistics to organize the storage of the secondary copies of data at the remote backup site, wherein organizing the data includes organizing the data according to its size and organizing the data according to its demand.

10. The system of claim 1 further comprises the intercept agent:

monitoring the health of the primary site and recognizing when the primary site fails;

capturing all future application data requests submitted to the primary site upon recognizing that the primary site has failed; and

redirecting the captured data requests to the business continuance appliance.

11. The system of claim 10 wherein the business continuance appliance checks the local cache if the captured data requests are read requests, in an attempt to satisfy the captured data requests, wherein if the requested data can be satisfied via the local cache, the business continuance appliance provides the requested data to the intercept agent.

12. The system of claim 11 wherein the intercept agent provides the requested data received from the staging agent to the requesting application associated with the captured data request.

13. The system of claim 12 wherein if the business continuance appliance is unable to satisfy the data request, the staging agent redirects the data request to the remote backup site.

14. The system of claim 13 wherein if the remote backup site can satisfy the data request, the backup agent provides the data to the staging agent, wherein the staging agent further provides the data to the intercept agent.

15. An article of manufacture for minimizing downtime in an appliance-based business continuance architecture, comprising:

a business continuance appliance in communication with a primary host machine and in communication with a remote backup site, wherein the business continuance appliance receives data requests and information associated with the data requests from the primary host, wherein the data requests include all read and write requests made to the primary host;

a local cache included within the business continuance appliance, wherein the local cache maintains copies of data associated with the data requests, wherein the copies are maintained according to the received information associated with the data requests,

whereby the data maintained by the local cache is utilized to provide a backup copy of data in the event of the primary site failing, without resorting to access of the remote backup site.

16. The article of manufacture of claim 15 wherein the received information comprises:

a description of the data request, including the type of the data request, wherein the type consists of read requests and write requests;

data associated with the data requests, when the data request is a write request; and

access patterns and statistics associated with the data requests, wherein the access patterns and statistics are collected at the primary host.

17. The article of manufacture of claim 16 wherein the business continuance appliance includes a staging agent, wherein the staging agent handles the receiving of the information associated with the data requests.

18. The article of manufacture of claim 17 wherein the staging agent forwards the received information to the remote backup site.

19. The article of manufacture of claim 18 wherein the staging agent is responsible for maintaining the local cache copies of the data associated with the data requests, wherein the staging agent utilizes the received information to determine which copies of the data are to be maintained and to determine at what location within the local cache the copies of the data are to be stored.

20. The article of manufacture of claim 19 further comprises utilizing a cache replacement algorithm to determine which copies of the data are to be maintained and to determine at what location within the local cache the copies of the data are to be stored.

21. The article of manufacture of claim 16 wherein the local cache comprises at least one disk drive.

22. The article of manufacture of claim 16 wherein the local cache comprises a RAM.

23. A method for deploying an appliance-based business continuance system in which downtime is minimized in response to a failure, comprising:

integrating computer-readable code into the system, wherein the code in combination with the system is capable of;

intercepting data requests made to the system and collecting access patterns and statistics associated with the intercepted data requests, wherein the intercepted data requests include data read requests and data write requests;

maintaining a local cache at a business continuance appliance within the system, wherein the local cache maintains copies of data associated the intercepted data requests, wherein the copies are maintained according to the collected access patterns and statistics;

maintaining backup copies of the system data at a remote backup site; and

responding to a failure in which the system'"'"'s primary storage is unable to satisfy the intercepted data requests, through utilizing the local cache and the remote backup site, wherein the remote backup site is accessed to handle the intercepted data requests which were not satisfied by the local cache.

24. A computer program product comprising a computer readable storage medium having instruction codes tangibly embodied thereon for minimizing downtime in an appliance-based business continuance architecture, the codes comprising:

a first set of instruction codes for intercepting data requests made to a host machine and to collect access patterns and statistics associated with the intercepted data requests, wherein the intercepted data requests include data read requests and data write requests;

a second set of instruction codes for providing communication between the host machine, a business continuance appliance and a remote backup site, wherein the business continuance appliance receives information associated with the intercepted data requests from the host machine;

a third set of instruction codes for maintaining a local cache included within the business continuance appliance, wherein the local cache stores copies of data associated the intercepted data requests, wherein the copies are maintained according to the received information associated with the data requests; and

a fourth set of instruction codes for providing the remote backup site with the intercepted data requests via the business continuance appliance, wherein the remote backup site maintains a secondary copy of the data located at the primary host,

whereby the data maintained by the local cache is utilized to provide a backup copy of data in the event of the primary site failing, without resorting to access of the remote backup site.

25. The computer program product of claim 24 further comprises instructions for recognizing that the host machine has failed.

26. The computer program product of claim 24 further comprises instructions for notifying the business continuance appliance of the host machine failure, wherein the business continuance appliance responds by satisfying all data read requests via the local cache if the data associated with the data requests is maintained by the local cache, otherwise the business continuance appliance forwards the data requests to the remote backup site.