Module mirroring during non-disruptive upgrade

1. A method, comprising:

creating a mirrored set of management processes for a storage cluster that is subject to an upgrade a new software version;

interconnecting components of the mirrored set and an original set of the management processes while the storage cluster is actively managed by the original set of management processes, the interconnecting including providing a shared memory interface between the original set of management processes and the mirrored set of management processes, wherein the components of the mirrored set communicate through a subnet of a network of the storage cluster that is different than a subnet of the network through which components of the original set of management processes communicate; and

upon completion of the upgrade, performing a handover between the management processes of the storage cluster.

2. The method of claim 1 , wherein the management processes include at least one platform module (PM) operating on a node in the storage cluster, the PM configured to monitor hardware components and managing node related flows.

3. The method of claim 2 , wherein the management processes include a system manager module (SYM) configured to aggregate cluster-wide information received from PMs and perform managerial functions for the storage cluster.

4. The method of claim 1 , wherein the mirrored set of management processes are created and interconnected while the storage cluster is operating in a degraded mode.

5. The method of claim 4 , wherein the degraded mode comprises a partially degraded launch where selected services are disabled.

6. The method of claim 4 , wherein the degraded mode further comprises a reduced frequency launch where select services are run with reduced frequency.

7. A system, comprising:

a memory comprising computer-executable instructions; and

a processor executing the computer-executable instructions, the computer-executable instructions when executed by the processor cause the processor to perform operations comprising:

creating a mirrored set of management processes for a storage cluster that is subject to an upgrade a new software version;

interconnecting components of the mirrored set and an original set of the management processes while the storage cluster is actively managed by the original set of management processes, the interconnecting including providing a shared memory interface between the original set of management processes and the mirrored set of management processes, wherein the components of the mirrored set communicate through a subnet of a network of the storage cluster that is different than a subnet of the network through which components of the original set of management processes communicate; and

upon completion of the upgrade, performing a handover between the management processes of the storage cluster.

8. The system of claim 7 , wherein the management processes include at least one platform module (PM) operating on a node in the storage cluster, the PM configured to monitor hardware components and managing node related flows.

9. The system of claim 8 , wherein the management processes include a system manager module (SYM) configured to aggregate cluster-wide information received from PMs and perform managerial functions for the storage cluster.

10. The system of claim 8 , wherein the mirrored set of management processes are created and interconnected while the storage cluster is operating in a degraded mode.

11. The system of claim 10 , wherein the degraded mode comprises a partially degraded launch where selected services are disabled.

12. The system of claim 11 , wherein the degraded mode further comprises a reduced frequency launch where select services are run with reduced frequency.

13. A computer program product embodied on a non-transitory computer readable medium, the computer program product including instructions that, when executed by a computer causes the computer to perform operations comprising:

creating a mirrored set of management processes for a storage cluster that is subject to an upgrade a new software version;

interconnecting components of the mirrored set and an original set of the management processes while the storage cluster is actively managed by the original set of management processes, the interconnecting including providing a shared memory interface between the original set of management processes and the mirrored set of management processes, wherein the components of the mirrored set communicate through a subnet of a network of the storage cluster that is different than a subnet of the network through a which components of the original set of management processes communicate; and

upon completion of the upgrade, performing a handover between the management processes of the storage cluster.

14. The computer program product of claim 13 , wherein the management processes include at least one platform module (PM) operating on a node in the storage cluster, the PM configured to monitor hardware components and managing node related flows.

15. The computer program product of claim 14 , wherein the management processes include a system manager module (SYM) configured to aggregate cluster-wide information received from PMs and perform managerial functions for the storage cluster.

16. The computer program product of claim 13 , wherein the mirrored set of management processes are created and interconnected while the storage cluster is operating in a degraded mode.

17. The computer program product of claim 16 , wherein the degraded mode comprises one of a partially degraded launch where selected services are disabled and a reduced frequency launch where select services are run with reduced frequency.