Storage pools with write atomicity

• US 7,444,482 B2
• Filed: 12/13/2007
• Issued: 10/28/2008
• Est. Priority Date: 04/28/2005
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Huras, Matthew Albert, Russell, Lance Warren, Mathews, Thomas Stanley
• Primary Examiner(s): Elmore; Stephen C
• Application Number:
  US11/955,505
• Publication Number:
  US 20080098184A1
• Time in Patent Office: 320 Days
• Field of Search: 711/154, 711/112, 711/114, 711/151, 711/156, 711/171
• US Class Current: 711/154
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

A method, apparatus, and computer program product for storage pools with write atomicity. An abstraction manager enforces write atomicity and disallows options which are inconsistent with write atomicity. The abstraction manager constructs through a physical device interface a logical continuous view of a storage pool in a manner consistent with write atomicity. Applications collect information specific to write atomicity from the abstraction manager through an application interface.

Claims

1. A data processing system for storage pools with write atomicity, the data processing system comprising:

signaling means for signaling an abstraction manager to enforce write atomicity in a selected storage pool;

alerting means for alerting the abstraction manager to place size and alignment restrictions on write requests to the selected storage pool and disallow options which are inconsistent with write atomicity wherein an option which is inconsistent with write atomicity is an option associated with fragmenting a write request, and wherein the abstraction manager disallows the option by failing any write request associated with the option;

forcing means for forcing the abstraction manager to construct, through a physical device interface, a logical continuous view of the selected storage pool in a manner consistent with write atomicity, wherein the abstraction manager conveys to a physical device in the selected storage pool, through the physical device interface, that a particular write request is not to be fragmented; and

enabling means for enabling an application to collect information specific to write atomicity from the abstraction manager through an application interface.

2. The data processing system of claim 1, further comprising:

adding means for adding a state for write atomicity to the abstraction manager, wherein the state is set at the time a storage pool is configured.

3. The data processing system of claim 1, further comprising:

constructing means for constructing the application interface for the purpose of the application querying the abstraction manager to collect certain information specific to write atomicity wherein the application interface is accessible to the application with the appropriate permission.

4. The data processing system of claim 1, wherein the abstraction manager fails a write request to the storage pool which cannot be completed atomically.

5. The data processing system of claim 1, wherein the abstraction manager returns to the application through the application interface a reason for a write request failure.

6. The data processing system of claim 1, wherein the abstraction manager conveys to an intelligent physical device through the physical device interface that a write request is not to be fragmented.

7. The data processing system of claim 1, wherein the abstraction manager detects through the physical device interface that a physical device may not be able to support write atomicity, and the abstraction manager disallows configuration of write atomicity for this physical device.

8. A computer program product on a computer-readable recordable-type medium for storage pools with write atomicity, the computer program product comprising:

first instructions for signaling an abstraction manager to enforce write atomicity in a selected storage pool;

second instructions for alerting the abstraction manager to place size and alignment restrictions on write requests to the selected storage pool and disallow options which are inconsistent with write atomicity, wherein an option which is inconsistent with write atomicity is an option associated with fragmenting a write request, and wherein the abstraction manager disallows the option by failing any write request associated with the option;

third instructions for forcing the abstraction manager to construct, through a physical device interface, a logical continuous view of the selected storage pool in a manner consistent with write atomicity, wherein the abstraction manager conveys to a physical device in the selected storage pool, through the physical device interface, that a particular write request is not to be fragmented; and

fourth instructions for enabling an application to collect information specific to write atomicity from the abstraction manager through an application interface.

9. The computer program product of claim 8, further comprising:

fifth instructions for adding a state for write atomicity to the abstraction manager, wherein the state is set at the time a storage pool is configured.

10. The computer program product of claim 8, further comprising:

fifth instructions for constructing the application interface for the purpose of the application querying the abstraction manager to collect certain information specific to write atomicity wherein the application interface is accessible to the application with the appropriate permission.

11. The computer program product of claim 8, wherein the abstraction manager fails a write request to the storage pool which cannot be completed atomically.

12. The computer program product of claim 8, wherein the abstraction manager returns to the application through the application interface a reason for a write request failure.

13. The computer program product of claim 8, wherein the abstraction manager conveys to an intelligent physical device through the physical device interface that a write request is not to be fragmented.