Method and apparatus for a segregated interface for parameter configuration in a multi-path failover system

• US 6,823,477 B1
• Filed: 01/23/2001
• Issued: 11/23/2004
• Est. Priority Date: 01/23/2001
• Status: Expired due to Term

• Current Assignee: PMC-Sierra Incorporated (Microchip Technology Incorporated)
• Original Assignee: Adaptec Incorporated (Steel Partners Holdings LP)
• Inventors: Cheng, Eric, Wu, Chang-Tying, Ding, Yafu
• Primary Examiner(s): Baderman, Scott
• Assistant Examiner(s): Duncan, Marc M
• Application Number:
  US09/768,860
• Time in Patent Office: 1,400 Days
• Field of Search: 714/7, 714/3, 714/4, 714/26, 710/316, 345/735, 345/736
• US Class Current: 714/26
• CPC Class Codes: G06F 11/2007 using redundant communication media
• CPC Class Codes: G06F 11/201 between storage system components
• CPC Class Codes: G06F 11/2053 where persistent mass storage functionality or persistent mass storage control functionality is redundant error detection or correction in information storage based on relative movement between record carrier and transducer G11B20/18
• 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

An invention is disclosed for a segregated user interface for parameter configuration in a multi-path failover system. The segregated user interface includes a user interface module capable of receiving configuration parameters for the multi-path failover system from a user. Further included is an object module that is capable of receiving the configuration parameters from the user interface module. The object module provides functionality and can detect the current controller status of controllers and the current device status of devices. In addition, the object module is capable of configuring a failover driver using the configuration parameters received from the user interface module.

Claims

1. A segregated user interface for parameter configuration in a multi-path failover system, comprising:

a user interface module capable of receiving configuration parameters for a multi-path failover system from a user, wherein the received configuration parameters include logical unit number (LUN) masking parameters, wherein the LUN masking parameters include a LUN masking without input/output (I/O) request blocking; and

an object module capable of receiving the configuration parameters from the user interface module, wherein the object module is capable of detecting a current controller status of a controller and a current device status of a device, and wherein the object module is further capable of configuring a failover driver using the received configuration parameters.

2. A segregated user interface as recited in claim 1, wherein the LUN masking parameters include a LUN masking with I/O request blocking.

3. A method for configuring parameters in a multi-path failover system, comprising the operations of:

detecting a current controller status of a controller and the current device status of a device;

displaying the current controller status and the current device status to a user;

receiving configuration parameters for a multi-path failover system from the user, the configuration parameters including logical unit number (LUN) masking parameters, wherein the LUN masking parameters include a LUN masking without input/output (I/O) request blocking; and

configuring a failover driver using the received configuration parameters.

4. A method as recited in claim 3, wherein the LUN masking parameters include a LUN masking with I/O request blocking.

5. A method as recited in claim 4, wherein the failover driver rejects all I/O requests destined for a device having a LUN masking with I/O request blocking.

6. A method as recited in claim 5, wherein a device having a LUN masking parameter is hidden from an operating system.

7. A system for configuring parameters in a multi-path failover system, comprising:

a user interface module capable of receiving configuration parameters for a multi-path failover system from a user;

an object module capable of receiving the configuration parameters from the user interface module, wherein the object module is capable of detecting a current controller status of a controller and the current device status of a device; and

a failover driver in communication with the object module, wherein the failover driver is capable of receiving the configuration parameters from the object module, wherein the failover driver is configured using the received configuration parameters,

wherein the multi-path failover system is configured to direct I/O requests to storage devices, and the multi-paths communicate with the storage devices;

wherein the failover driver is further configured to detect the multi-paths and to determine prior and current status of the multi-paths; and

wherein the failover driver is further configured to calculate a failure probability for each detected path based on the respective prior and current status of the multi-path and to select, for the communication with the storage device, the path having a lowest probability of failure.

8. A system for configuring parameters in a multi-path failover system, comprising:

a user interface module capable of receiving configuration parameters for a multi-path failover system from a user, wherein the configuration parameters include logical unit number (LUN) masking parameters, wherein the LUN masking parameters include a LUN masking without input/output (I/O) request blocking;

an object module capable of receiving the configuration parameters from the user interface module, wherein the object module is capable of detecting a current controller status of a controller and the current device status of a device; and

a failover driver in communication with the object module, wherein the failover driver is capable of receiving the configuration parameters from the object module, wherein the failover driver is configured using the received configuration parameters.

9. A system as recited in claim 8, wherein the LUN masking parameters include a LUN masking with I/O request blocking.

10. A segregated user interface for parameter configuration in a multi-path failover system, comprising:

a user interface module capable of receiving configuration parameters for a multi-path failover system from a user, the user interface module further capable of displaying a current controller status and a current device status; and

an object module capable of receiving the configuration parameters from the user interface module, wherein the object module is capable of detecting a current controller status of a controller and the current device status of a device, and wherein the object module is further capable of configuring a failover driver using the received configuration parameters, wherein the configuration parameters include a LUN masking without input/output (I/O) request blocking parameter and a LUN masking with I/O request blocking parameter.

11. A segregated user interface as recited in claim 10, wherein the object module is capable of disabling and enabling failover features for a particular data path.

12. A segregated user interface as recited in claim 11, wherein the failover features represent an ability to reroute an I/O request destined for a particular I/O device when a primary data path to the I/O device has failed.

13. A method for configuring parameters in a multi-path failover system, comprising the operations of:

detecting a current controller status of a controller and the current device status of a device;

displaying the current controller status and the current device status to a user;

receiving configuration parameters for a multi-path failover system from the user, the configuration parameters including a LUN masking without input/output (I/O) request blocking parameter and a LUN masking with I/O request blocking parameter; and

configuring a failover driver using the received configuration parameters such that the failover driver rejects all I/O requests destined for a device having a LUN masking with I/O request blocking, and wherein a device having a LUN masking parameter is hidden from an operating system.

14. A method as recited in claim 13, further comprising the operation of disabling and enabling failover features for a particular data path.

15. A method as recited in claim 14, wherein the failover features represent an ability to reroute an I/O request destined for a particular I/O device when a primary data path to the I/O device has failed.

16. A system for configuring parameters in a multi-path failover system, comprising:

a user interface module capable of receiving configuration parameters for a multi-path failover system from a user, the user interface module further capable of displaying a current controller status and a current device status;

an object module capable of receiving the configuration parameters from the user interface module, wherein the object module is capable of detecting a current controller status of a controller and the current device status of a device, wherein the configuration parameters include a LUN masking without input/output (I/O) request blocking parameter and a LUN masking with I/O request blocking parameter; and

a failover driver in communication with the object module, wherein the failover driver is capable of receiving the configuration parameters from the object module, wherein the failover driver is configured using the received configuration parameters.

17. A system as recited in claim 16, wherein the failover driver is capable of receiving disable and enable failover parameters for a particular data path from the object module.

18. A system as recited in claim 17, wherein the failover driver reroutes I/O requests destined for a particular I/O device when a primary data path to the I/O device has failed in response to receiving an enable failover parameter.

19. A method for providing an interface to a failover driver, comprising the operation of:

providing a segregated user interface, the segregated user interface having a front end to receive user commands and a back end to provide configuration commands to a failover driver, wherein configuration parameters include logical unit number (LUN) masking parameters, wherein the LUN masking parameters include a LUN masking without input/output (I/O) request blocking.

20. A method as recited in claim 19, wherein the LUN masking parameters include a LUN masking with I/O request blocking.