Managing a data storage array, a data storage system, and a raid controller

• US 6,807,605 B2
• Filed: 10/03/2002
• Issued: 10/19/2004
• Est. Priority Date: 10/03/2002
• Status: Expired due to Fees

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Navarro, Guillermo, Daniels, Rodger, Umberger, David
• Primary Examiner(s): Sparks, Donald
• Assistant Examiner(s): Peugh, Brian R.
• Application Number:
  US10/264,915
• Publication Number:
  US 20040068610A1
• Time in Patent Office: 747 Days
• Field of Search: 711/112, 711/114, 711/154, 711/165, 711/162, 714/6, 714/7
• US Class Current: 711/114
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 2211/1004 Adaptive RAID, i.e. RAID system adapts to changing circumstances, e.g. RAID1 becomes RAID5 as disks fill up

Abstract

A system and method for managing a RAID data storage array is provided having a plurality of data storage disks and a RAID controller respectively coupled to each of the data storage disks, and a user interface coupled to the RAID controller, wherein the RAID controller is configured to store pointers corresponding to data within the storage disks, wherein the RAID controller is further configured to anticipate a data modification operation from the user interface and to selectively copy a block of data from one RAID level to a different RAID level storage location within the storage array responsive to a protective status and the anticipating. Also provided is a RAID controller configured to selectively copy data to a different RAID level within a storage array responsive to the anticipation of a data modification operation and a protective status.

Claims

1. A system for managing a data storage array, comprising:

a plurality of data storage disks configured as an array; and

a RAID controller coupled to each of the data storage disks within the array and configured to access data within the array and to measure the rate at which data within the array is being accessed by a user application, the RAID controller further including a memory and a user interface coupled to the RAID controller, the RAID controller being further configured to store a set of pointers within the memory, the pointers respectively corresponding to blocks of data within the array, each pointer being accessible by the user application, the RAID controller being further configured to anticipate a data modification operation to a particular block of data in the array responsive to the measuring and to selectively copy the particular block of data to a different block of data within a different RAID level storage location within the array responsive to the anticipating.

2. A system in accordance with claim 1 wherein the RAID controller is further configured to selectively create a different pointer corresponding to the different block of data.

3. A system in accordance with claim 1 wherein the RAID controller is further configured to perform the measuring and the anticipating and the copying from time to time.

4. A system in accordance with claim 1 wherein the RAID controller is further configured to selectively invoke a protective status for the particular block of data within the array.

5. A system in accordance with claim 4 wherein the RAID controller is further configured to selectively perform the copying of the particular block of data to the different block of data responsive to the anticipating and the protective status.

6. A method of managing a data storage system, comprising:

providing an array of data disks configured to store data;

providing a RAID controller coupled to the array;

providing a user interface computer coupled to the RAID controller;

running an application program using the user interface computer;

reading data stored within the array using the application program and the RAID controller;

assembling and storing a pointer corresponding to the read data using the RAID controller;

accessing the data within the array by way of the pointer using the application program and RAID controller;

measuring the rate of the accessing using the RAID controller;

anticipating a data modification operation to particular data in one RAID level within the array in response to the measuring using the RAID controller;

selectively copying the particular data to another RAID level within the array in response to the anticipating using the RAID controller; and

performing the data modification operation to the copied data within the array using the RAID controller, the copying being performed as a background operation using the RAID controller.

7. A method in accordance with claim 6 and further comprising selectively creating another pointer corresponding to the copied data using the RAID controller.

8. A method in accordance with claim 6 and further comprising selectively invoking a protective status for the particular data and selectively performing the copying and the data modification responsive to the anticipating and the protective status.

9. A RAID controller, comprising:

a memory configured to store data;

monitoring electronics configured to measure a rate at which an array of data storage disks coupled to the controller are accessed using the Raid controller; and

circuitry coupled to the memory and the monitoring electronics and configured to access data at different RAID levels within the array in response to corresponding instructions from a computer, the circuitry being further configured to selectively configure a pointer related to the data in the array in response to a corresponding instruction from the computer, the circuitry being further configured to anticipate a data modification operation in response to the measuring, the circuitry being further configured to selectively copy a portion of the data in one RAID level within the array to a different RAID level within the array as a background operation in response to the anticipating using the memory.

10. A RAID controller in accordance with claim 9 wherein the circuitry is further configured to selectively create a new pointer corresponding to the copied data.

11. A RAID controller in accordance with claim 9 wherein the monitoring electronics are further configured to determine an amount of free space in the array, and wherein the circuitry is further configured to perform the copying in response to the anticipating and the determining.

12. A RAID controller in accordance with claim 9 wherein the circuitry is further configured to selectively invoke a protective status for the portion of the data in the one RAID level of the array and to perform the selective copying in response to the anticipating and the protective status.

13. A RAID controller in accordance with claim 9 wherein the circuitry is further configured to modify the copied data in response to a corresponding instruction from the computer.

14. A computer readable medium comprising computer readable code, the computer readable code configured to cause a RAID controller to:

read data within an array of data storage disks coupled to the RAID controller in response to corresponding instructions from a computer;

selectively configure a pointer related to the read data;

access data within the array using the pointer in response to corresponding instructions from the computer;

anticipate a data modification operation in response to measuring a rate at which the data within the array is accessed; and

selectively copy a portion of the data in one RAID level within the array to a different RAID level within the array as a background operation in response to the anticipating.

15. A computer readable medium in accordance with claim 14 wherein the computer readable medium comprises firmware.

16. A RAID controller, comprising:

a memory configured to store data;

monitoring electronics configured to measure a rate at which an array of data storage disks coupled to the RAID controller are accessed using the RAID controller; and

firmware bearing computer readable code, the computer readable code being configured to cause the RAID controller to;

read data within the array in response to corresponding instructions from a computer;

selectively configure a pointer related to the read data;

access data within the array using the pointer in response to a corresponding instruction from the computer;

anticipate a data modification operation in response to measuring the rate using the monitoring electronics; and

selectively copy a portion of the data in one RAID level within the array to a different RAID level within the array as a background operation in response to the anticipating using the memory.

17. A computer readable medium comprising computer readable code, the computer readable code configured to cause a computer to:

read data within different RAID levels within an array of data storage disks coupled to the computer in response to corresponding instructions sent from the computer to a RAID controller;

selectively configure a plurality of pointers related to the read data, the pointers being stored within a memory of the computer;

access data at different RAID levels within the array using the pointers in response to corresponding instructions sent from the computer to the RAID controller;

measure a rate at which the computer is accessing the data within the array;

anticipate a data modification operation in response to the measuring; and

selectively instruct the RAID controller to copy a portion of the data in one RAID level within the array to a different RAID level within the array as a background operation in response to the anticipating.

18. A computer readable medium in accordance with claim 17 wherein the computer readable medium is selected from the group consisting of magnetic disk, magnetic tape, compact disk, ROM, EPROM, optical disk, and magneto-optical disk.

19. A method of managing a data storage system, comprising:

providing an array of data disks configured to store data;

providing a RAID controller coupled to the array;

providing a computer coupled to the RAID controller;

providing a computer readable medium having computer readable code in cooperative relation to the computer;

running the computer readable code using the computer;

reading data stored within the array using the computer readable code and the computer and the RAID controller;

assembling and storing a pointer corresponding to the read data within a memory of the computer using the computer readable code and the computer;

accessing the data within the array by way of the pointer using the computer readable code and the computer and the RAID controller;

measuring the rate of the accessing the data using the computer readable code and the computer;

anticipating a data modification operation to particular data in one RAID level within the array in response to the measuring using the computer readable code and the computer;

selectively copying the particular data to another RAID level within the array in response to the anticipating using the computer readable code and the computer and the RAID controller; and

performing the data modification operation to the copied data within the array using the computer readable code and the computer and the RAID controller, the copying and the data modification being performed as a background operation.