System and method for atomizing storage

• US 6,895,467 B2
• Filed: 10/22/2001
• Issued: 05/17/2005
• Est. Priority Date: 10/22/2001
• Status: Expired due to Term

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Yandell, Jesse L., Korgaonkar, Anuja, Roberson, Randy L., Bean, Robert G., Woestehoff, Keith D., Lubbers, Clark E., Reiser, James M.
• Primary Examiner(s): Padmanabhan, Mano
• Assistant Examiner(s): Song, Jasmine
• Application Number:
  US10/040,194
• Publication Number:
  US 20030084241A1
• Time in Patent Office: 1,303 Days
• Field of Search: 711/112, 711/114, 711/154, 711/147, 711/111, 711/4, 711170-173, 709/223
• US Class Current: 711/114
• CPC Class Codes: G06F 2003/0697 device management, e.g. handlers, drivers, I/O schedulers
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems

Abstract

Systems, methods and software for implementing a virtualized storage system. Physical storage is carved into units called physical segments. Logical storage is implemented in atomic logical units called RStores comprising a range of virtual address space that when allocated, is bound to a particular group of PSEGs. RStores preferably implement a selected level of data protection. A pool of physical storage devices is carved into redundant storage sets. A plurality of RStores make up a logical disk that is presented to a user. Storage access requests expressed in terms of logical disk addresses are mapped to PSEGs containing data represented by the logical addresses through a split-directory representation of the logical unit.

Claims

1. A method of configuring a pool of physical storage disks comprising:

defining a plurality of uniquely identifiable physical segments within each member of the pool of physical storage disks; and

defining a first storage set comprising a selected group of the physical segments from at least a first physical storage disk;

defining a second storage set comprising at least one group of physical segments from the first physical storage disk;

implementing a first level of data protection for the first storage set; and

implementing a second level of data protection for the second storage set;

wherein the second level of data protection is different from the first level of data protection.

2. The method of claim 1 wherein the physical storage disks are of varying individual capacity.

3. The method of claim 1 wherein the physical segments have a single capacity.

4. The method of claim 1 wherein the physical segments have varying capacity.

5. The method of claim 1 wherein the physical segments comprise a plurality of sectors in each physical storage disk.

6. The method of claim 1 wherein the physical segments comprise a contiguous set of physical sectors in each physical storage disk.

7. The method of claim 1 wherein the physical segments comprise more than 1 Mbyte of storage capacity.

8. The method of claim 1 wherein the physical segments comprise less than 32 MByte of storage capacity.

9. The method of claim 1 wherein the first storage set comprises at least five physical segments.

10. The method of claim 1 wherein the first storage set comprises physical segments located on independent storage disks.

11. A method of configuring a pool of physical storage disks into a storage set comprising:

dividing the physical storage disks into a plurality of uniquely identifiable physical segments;

aggregating a first plurality of uniquely identifiable physical segments into a first redundant store entity;

assigning a first data protection level to the at least one redundant store entity;

aggregating a second plurality of uniquely identifiable physical segments into a second redundant store entity; and

assigning a second data protection level, different from the first data protection level, to the second redundant store entity,

wherein the first redundant storage entity and the second redundant storage entity comprise physical storage segments from a common disk drive.

12. The method of claim 11 wherein the first redundant store entity implements data protection independently of any other redundant store entity formed from the pool of physical storage disks.

13. A storage controller, comprising:

a processor; and

a memory module communicatively connected to the processor and comprising logic instructions which, when executed by the processor, configure the processor to;

define a plurality of uniquely identifiable physical segments within each member of the pool of physical storage disks; and

define a first storage set comprising a selected group of the physical segments from at least a first physical storage disk;

define a second storage set comprising at least one group of physical segments from the first physical storage disk;

implement a first level of data protection for the first storage set; and

implement a second level of data protection for the second storage set;

wherein the second level of data protection is different from the first level of data protection.