Management of server cache storage space

• US 9,361,032 B2
• Filed: 05/14/2014
• Issued: 06/07/2016
• Est. Priority Date: 05/14/2014
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Chiu, Lawrence Y., Kim, Hyojun, Lu, Maohua, Muench, Paul H., Seshadri, Sangeetha
• Primary Examiner(s): SONG, HUA JASMINE
• Application Number:
  US14/277,154
• Publication Number:
  US 20150331622A1
• Time in Patent Office: 755 Days
• Field of Search: 711/102, 711/113, 711/103, 709223-224, 709226-227, 709/229
• US Class Current: 1/1
• CPC Class Codes: G06F 12/0238 Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
• CPC Class Codes: G06F 12/0806 Multiuser, multiprocessor or multiprocessing cache systems
• CPC Class Codes: G06F 16/1748 De-duplication implemented within the file system, e.g. based on file segments de-duplication techniques in storage systems for the management of data blocks G06F3/0641
• CPC Class Codes: G06F 2206/1014 One time programmable [OTP] memory, e.g. PROM, WORM
• CPC Class Codes: G06F 2212/154 Networked environment
• CPC Class Codes: G06F 2212/62 Details of cache specific to multiprocessor cache arrangements
• CPC Class Codes: G06F 2212/7201 Logical to physical mapping or translation of blocks or pages
• CPC Class Codes: G06F 2212/7202 Allocation control and policies
• CPC Class Codes: G06F 2212/7207 management of metadata or control data
• CPC Class Codes: G06F 2212/7209 Validity control, e.g. using flags, time stamps or sequence numbers
• CPC Class Codes: G06F 3/0611 in relation to response time
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0641 De-duplication techniques
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

Abstract

An application server can be configured to access data stored on a networked storage server that is accessible over a network and that includes a cache device configured to store data received from the networked storage server. The application server can include a cache management module that is designed to monitor a data access requests transmitted over the network, the data access requests specifying a first page of data. In response to an indication that the requested data includes data stored in the cache device as an existing page of data, the first page of data can be mapped to a location corresponding to the existing page.

Claims

1. A computer implemented method comprising:

identifying at a first time that a first page of data within at least one networked storage server is a duplicate of a second page of data stored within the at least one networked storage server, the identifying being performed by a deduplication server configured to monitor requests to access the at least one networked storage server;

detecting a request transmitted over a network at a second time to the at least one networked storage server, the request requesting that the first page of data stored on the at least one networked storage server be provided to an application server, wherein the first time is before the second time; and

in response to detecting the request, providing the indication to the application server over the network, the indication indicating that the first page of data is a duplicate of the second page of data stored within a cache that is locally accessibly by the application server relative to the network.

2. The method of claim 1, wherein the cache is configured as a write-through cache.

3. The method of claim 1, wherein the cache is a solid state memory device.

4. The method of claim 1, further comprising storing tracking data corresponding to data content of pages accessed by applications running on the application server and generating, based upon the tracking data, the indication.

5. The method of claim 4, wherein the tracking data includes fingerprint data of the data content of the pages accessed by the applications running on the application server.

6. The method of claim 1, further comprising:

identifying, in response to the indication, a location of the second page of data within the cache; and

mapping the first page of data to the location.

7. A system comprising:

a deduplication server coupled with a network, the deduplication server having a processor and a memory, deduplication server being configured to monitor data access requests transmitted over the network, wherein a first one of the data access requests specifies a first page of data, and generate, based upon tracking of data content stored in a cache device, an indication, wherein the indication indicates that data corresponding to the first data access request is a duplicate of data stored in the cache device as an existing page of data;

a networked storage server having a processor and a memory, the networked storage server being accessible over the network; and

an application server having a processor, a memory, the cache device, and a cache management module, the application server configured to access data stored on the networked storage server over the network, the cache device being configured to cache data stored on the networked storage server, and the cache management module being designed to;

detect the indication;

identify, in response to detecting the indication, a location of the existing page of data within the cache device; and

map the first page of data to the location, wherein the deduplication server, the networked storage server, and the application server are distinct from one another.

8. The system of claim 7, wherein the cache management module that is further designed to map the first page of data to the location by updating page tables of at least one client residing on the application server.

9. The system of claim 7, the deduplication server is further configured to generate, based upon tracking of data content stored in the cache device, the indication independently from the at least one request of the data access requests.

10. The system of claim 7, wherein the cache device is configured as a write-through-cache.

11. The system of claim 10, wherein the cache device includes a solid-state storage device that is accessible using an input/output (I/O) computer motherboard bus of the application server.

12. A computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to perform a method comprising:

identifying at a first time that a first page of data within at least one networked storage server is a duplicate of a second page of data stored within the at least one networked storage server, the identifying being performed by a deduplication server configured to monitor requests to access the at least one networked storage server;

detecting a request transmitted over a network at a second time, the request requesting that the first page of data stored on the at least one networked storage server be provided to an application server, wherein the first time is before the second time; and

in response to detecting the request, providing the indication, the indication indicating that the first page of data is a duplicate of the a second page of data stored within a cache located between the application server and the network.

13. The computer program product of claim 12, wherein the cache is configured as a write-through cache.

14. The computer program product of claim 12, wherein the cache is a solid state memory device.

15. The computer program product of claim 12, wherein the method comprises storing tracking data corresponding to data content of pages accessed by applications running on the application server and generating, based upon the tracking data, the indication.

16. The computer program product of claim 15, wherein the tracking data includes fingerprint data of the data content of the pages accessed by the applications running on the application server.

17. The computer program product of claim 12, further comprising:

identifying, in response to the indication, a location of the second page of data within a cache; and

mapping the first page of data to the location.