Method and apparatus for a storage controller to dynamically determine the usage of onboard I/O ports

• US 7,689,736 B2
• Filed: 11/07/2005
• Issued: 03/30/2010
• Est. Priority Date: 11/07/2005
• Status: Expired due to Fees

• Current Assignee: Dot Hill Systems Corporation (Seagate Technology Holdings Plc)
• Original Assignee: Dot Hill Systems Corporation (Seagate Technology Holdings Plc)
• Inventors: Kalwitz, George A.
• Primary Examiner(s): Tsai; Henry W. H.
• Assistant Examiner(s): TSENG, CHENG YUAN
• Application Number:
  US11/268,984
• Publication Number:
  US 20070130373A1
• Time in Patent Office: 1,604 Days
• Field of Search: 710/8, 710/15, 710/106, 710/22, 710/112, 710/162, 710/2, 710/36, 719/326, 709/208, 709/209, 370/216, 370/389, 370/401, 370/360, 370/522
• US Class Current: 710/31
• CPC Class Codes: G06F 11/3034 where the computing system component is a storage system, e.g. DASD based or network based digital input from or digital output to record carriers G06F3/06; digital recording or reproducing G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/3051 Monitoring arrangements for monitoring the configuration of the computing system or of the computing system component, e.g. monitoring the presence of processing resources, peripherals, I/O links, software programs verification or detection of system hardware configuration G06F11/2247
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0632 by initialisation or re-initialisation of storage systems
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

Methods and systems for automatically and dynamically identifying capabilities of devices connected to a storage system controller port and setting operating parameters of that port are described. In particular, a storage system controller administers scanning and probing functions to determine capabilities of devices connected to a given port. Based on the determined capabilities of all or a subset of the devices connected to that port, an operating parameter is assigned to that port.

Claims

1. A method of identifying a device interconnected to a port of a storage system controller, comprising:

(a) scanning by said storage system controller a network external to said storage system controller through said port of the storage system controller to determine whether any devices are connected to said first port of said storage system controller;

(b) in response to said scanning, determining by said storage system controller that at least one device is connected to said first port of said storage system controller;

(c) probing by said storage system controller said at least one device that is connected to said first port of said storage system controller;

(d) in response to said probing, determining by said storage system controller capabilities of said at least one device connected to said first port of said storage system controller;

(e) in response to said determining capabilities and based on said determined capabilities, determining, by said storage system controller, a proper operating mode for said first port of said storage system controller;

(f) in response to said determining a proper operating mode for said first port of said storage system controller, first setting, by said storage system controller, an operating mode for said first port of said storage system controller, wherein said first port of said storage system controller is set to one of an initiator if every one of said devices has target device capabilities, a target if every one of said devices has initiator device capabilities, and a target/initiator if less than all devices have target device capabilities and at least one device has target device capabilities, wherein prior to said first setting an operating mode for said first port of said storage system controller a proper operating mode for said first port of said storage system controller is undetermined, and wherein said proper operating mode of said first port of said storage system controller is set after said first port of said storage system controller is interconnected to said at least one device, wherein steps (a) through (f) are iteratively performed periodically; and

(g) after said first setting an operating mode of said first port of said storage system controller, transmitting data between said first port of said storage system controller and said at least one device according to the set mode.

2. The method of claim 1, further comprising:

(h) scanning by said storage system controller a network external to a second port of said storage system controller;

(i) in response to said scanning, determining by said storage system controller that at least one device is connected to said second port of said storage system controller;

(j) probing said at least one device that is connected to said second port of said storage system controller;

(k) in response to said probing, determining by said storage system controller capabilities of said at least one device connected to said second port of said storage system controller; and

(l) based on said determined capabilities of said at least one device connected to said second port of said storage system controller, setting by said storage system controller an operating mode for said second port of said storage system controller, wherein said operating mode for said second port of said storage system controller is set to one of initiator, target, and target/initiator.

3. The method of claim 2, wherein said determining capabilities of said at least one device connected to said first port of said storage system controller and said determining by said storage system controller capabilities of said at least one device connected to said second port of said storage system controller are performed at substantially the same time.

4. The method of claim 2, wherein said operating mode set for said first and second port of said storage system controller are different.

5. The method of claim 1, further comprising:

(h) detecting a change related to said first port of said storage system controller and in response to detecting said change, performing steps (a) through (f).

6. The method of claim 1, wherein said at least one storage device interconnects to said storage system controller by a network.

7. A storage system controller for use in a storage device network, comprising:

(a) a first port;

(b) a processor, comprising;

(i) a scanning function executing on the processor of the storage system controller that scans the first port of the storage system controller; and

(ii) an identification function running on the processor of the storage system controller that probes devices connected to the first port of the storage system controller, wherein the identification function determines operating parameters of the first port of the storage system controller based on capabilities of the devices connected to the first port of the storage system controller, wherein in response to the determination by the identification function an operating mode for the first port of the storage system controller is set to one of an initiator if every one of said devices has target device capabilities, a target if every one of said devices has initiator device capabilities, and a target/initiator if less than all devices have target device capabilities and at least one device has target device capabilities, wherein the scanning function and identification function are iteratively performed periodically, and wherein after the operating mode for the first port of the storage system controller is set by the storage system controller the storage system controller uses the first port of the storage system controller in connection with the storage and retrieval of data to and from at least one of the devices connected to the first port of the storage system controller.

8. The storage system controller of claim 7, wherein the storage device network is at least one of a Fibre Channel network, an Ethernet Network or an SCSI bus, and an SAS network.

9. The storage system controller of claim 7, further comprising a second port, wherein the scanning function of the storage system controller scans the second port of the storage system controller, and wherein the identification function probes devices connected to the second port of the storage system controller and determine operating parameters of the second port of the storage system controller based on capabilities of devices connected to the second port of the storage system controller, and wherein the identification function determines that the second port of the storage system controller is one of an initiator port, a target port, and a target/initiator port.

10. The storage system controller of claim 9, wherein the identification function identifies the proper operating mode of the first port of the storage system controller as an initiator port and the proper operating mode of the second port of the storage system controller as a target port.

11. The storage system controller of claim 7, further comprising a change detection function executing on the processor of the storage system controller that identifies when a change has occurred with respect to the first port of the storage system controller, wherein the change detection function communicates a change in the first port of the storage system controller and in response to the communicated change, the identification function determines operating parameters of the first port of the storage system controller.

12. A storage system, comprising:

a first storage system controller, including;

(a) at least a first port;

(b) a means for scanning said at least a first port;

(c) a means for probing and identifying capabilities of devices connected to said at least a first port;

(d) a means for determining an appropriate operating parameter of the at least a first port of said first storage system controller based on the identified capabilities of devices connected to said at least a first port of said first storage system controller; and

(e) a means for assigning, by the first storage system controller, said determined appropriate operating parameter to said at least a first port of said first storage system controller, wherein said first port of said first storage system controller is assigned to be one of an initiator port if every one of said devices has target device capabilities, a target port if every one of said devices has initiator device capabilities, and a target/initiator port if less than all of said devices has target device capabilities and at least one of said devices has target device capabilities, wherein said means for scanning, said means for probing and identifying, said means for determining, and said means for assigning are iteratively performed periodically, and wherein after an operating parameter is assigned to said first port of said first storage system controller data is passed between said first port of said first storage system controller and at least one of said devices connected to said first port of said first storage system controller.

13. The system of claim 12, further comprising a network coupled to the first port of the first storage system controller and the devices, wherein said network is at least one of a Fibre Channel network, an Ethernet Network, an SCSI bus, and an SAS network.

14. The system of claim 12, said first storage system controller further comprising at least a second port wherein said means for scanning scans said at least a second port of said first storage system controller, wherein said means for probing probes devices connected to said at least a second port of said first storage system controller, wherein said means for assigning assigns an operating parameter to said at least a second port of said first storage system controller based on capabilities of said devices connected to said at least a second port of said first storage system controller, and wherein said second port of said first storage system controller is assigned to be one of an initiator port, a target port, and a target/initiator port.

15. The system of claim 12, further comprising a means for detecting change that identifies when a change has occurred with respect to said at least a first port of said first storage system controller, wherein said means for detecting change communicates a change in said at least a first port of said first storage system controller and in response to said communicated change, said means for probing probes said devices connected to said at least a first port of said first storage system controller.