SCALEABLE STORAGE ARRAY

• US 20190205031A1
• Filed: 03/11/2019
• Published: 07/04/2019
• Est. Priority Date: 05/03/2016
• Status: Active Grant

• Current Assignee: Pure Storage, Inc.
• Original Assignee: Pure Storage, Inc.
• Inventors: Shalev, Ori
• Granted Patent: US 10,649,659 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0635 by changing the path, e.g. traffic rerouting, path reconfiguration
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/0658 Controller construction arrangements
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0683 Plurality of storage devices

Abstract

A method of operating a storage system is disclosed. The method includes determining a storage cluster among storage arrays of the storage system. Each storage array includes at least two controllers and at least one storage shelf. The at least two controllers are configured to function as both a primary controller for a first storage array and a secondary controller for a second storage array.

Claims

1. A method of operating a storage system, comprising:

configuring a first controller and a second controller each to function as both a primary controller for a first storage array and a secondary controller for a second storage array;

monitoring I/O requests; and

reducing a number of relay events for one or more of the I/O requests by reassigning the first controller to handle a request that is assigned to the second controller, responsive to the monitoring.

2. The method of claim 1 wherein the secondary controller is shared by multiple primary controllers.

3. The method of claim 1 wherein the secondary controller is shared by more than one storage component.

4. The method of claim 1 further comprising:

accessing global metadata; and

forwarding I/O requests based on the global metadata.

5. The method of claim 1 further comprising:

receiving an I/O request at the first controller;

determining the I/O request is associated with second controller; and

forwarding the I/O request to the second controller.

6. The method of claim 1 further comprising:

suggesting actions to reduce the number of relay events based on the monitoring, wherein the actions includes one of migrating a volume from one storage array to another, adding or removing storage capacity to a storage array, or changing cabling for relay minimization purposes.

7. The method of claim 1 wherein the reducing the number of relay events for one or more I/O requests comprises:

modifying metadata replicated across storage arrays; and

communicating the modified metadata across the storage arrays.

8. A storage array, comprising:

a first controller and a second controller;

at least one storage shelf, wherein each of the first and second controllers are configurable to

function as both a primary controller for a first storage array and a secondary controller for a second storage array;

a monitoring component that monitors forwarded I/O requests; and

a relay event reducing component that, responsive to the monitoring, reduces a number of relay events for one or more I/O requests by reassigning the first controller to handle a request that is assigned to the second controller, responsive to the monitoring.

9. The storage system of claim 8 wherein the secondary controller is shared by multiple primary controllers.

10. The storage system of claim 8 wherein the secondary controller is shared by more than one storage array.

11. The storage system of claim 8 further comprising:

a global metadata accessing component that accesses global metadata; and

an I/O forwarding component that forwards I/O requests based on the global metadata.

12. The storage system of claim 8 wherein an I/O request that is received at the first controller is forwarded to the second controller if it is determined that the I/O request is associated with the second controller.

13. The storage system of claim 8, wherein the relay event reducing component includes suggesting actions to reduce the number of relay events based on the monitoring component, wherein the actions includes one of migrating a volume from one storage array to another, adding or removing storage capacity to a storage array, or changing cabling for relay minimization purposes.

14. The storage system of claim 8 wherein the relay event reducing component reduces the number of relay events for one or more I/O requests by modifying metadata replicated across storage arrays, and communicating the modified metadata across the storage arrays.

15. A non-transitory computer-readable storage medium having program instructions stored thereon, which when executed by at least one processor, cause the at least one processor to perform a method comprising:

configuring a first controller and a second controller each to function as both a primary controller for a first storage array and a secondary controller for a second storage array;

monitoring I/O requests; and

reducing a number of relay events for one or more of the I/O requests by reassigning the first controller to handle a request that is assigned to the second controller, responsive to the monitoring.

16. The medium of claim 15 wherein the secondary controller is shared by multiple primary controllers.

17. The medium of claim 15 wherein the secondary controller is shared by more than one storage array.

18. The medium of claim 15 wherein the method further comprises:

accessing global metadata; and

forwarding I/O requests based on the global metadata.

19. The medium of claim 15 wherein the method further comprises:

receiving an I/O request at the first controller;

determining the I/O request is associated with the second controller; and

forwarding the I/O request to the second controller.

20. The medium of claim 15, wherein the method further comprises:

suggesting actions to reduce the number of relay events based on the monitoring, wherein the actions includes one of migrating a volume from one storage array to another, adding or removing storage capacity to a storage array, or changing cabling for relay minimization purposes.