Granted Patent B1

US 11,386,023 · App. 17/154,056 · Granted Jul 12, 2022

Inventors: Madhu Tarikere (Bangalore, IN); Vinay G. Rao (Bangalore, IN)

Assignee: EMC IP Holding Company LLC

G06F13/1668H04L67/1097

Abstract

Claims (55)

1. An apparatus comprising:

at least one processing device comprising a processor coupled to a memory;

wherein the at least one processing device is configured:

to control delivery of input-output operations from a host device to a storage system over selected ones of a plurality of paths through a network;

to send one or more requests to the storage system for data corresponding to states of a plurality of storage devices in the storage system;

wherein the one or more requests comprise a directive that the data corresponding to the states returned by the storage system relate to changes in the states of the plurality of storage devices;

to receive the data corresponding to the states from the storage system;

to identify one or more state changes of one or more of the plurality of storage devices based on the received data; and

to manage one or more of the input-output operations responsive to the identified one or more state changes.

2. The apparatus of claim 1 wherein the plurality of storage devices are divided into a plurality of groups, the plurality of groups comprising respective ones of a plurality of asymmetric namespace access (ANA) groups.

3. The apparatus of claim 2 wherein the plurality of storage devices comprise a plurality of storage volumes, respective ones of the plurality of storage volumes corresponding to a namespace associated with a namespace identifier.

4. The apparatus of claim 2 wherein:

the data corresponding to the states from the storage system comprises at least one ANA group descriptor for at least one ANA group of the plurality of ANA groups; and

the at least one ANA group descriptor indicates a change in data associated with the least one ANA group descriptor from a previous instance of the least one ANA group descriptor.

5. The apparatus of claim 4 wherein:

the data corresponding to the states from the storage system omits at least one other ANA group descriptor for at least one other ANA group of the plurality of ANA groups not indicating a change in data from a previous instance of the least one other ANA group descriptor.

6. The apparatus of claim 2 wherein:

the data corresponding to the states from the storage system comprises a plurality of ANA group descriptors for respective ones of the plurality of ANA groups; and

each of the plurality ANA group descriptors indicates a change in data associated with the ANA group descriptor from a previous instance of the ANA group descriptor responsive to the directive that the data corresponding to the states returned by the storage system relate to changes in the states of the plurality of storage devices.

7. The apparatus of claim 2 wherein:

the data corresponding to the states from the storage system comprises a plurality of ANA group descriptors for respective ones of the plurality of ANA groups; and

the at least one processing device is further configured to maintain a count of changes in data associated with respective ones of the plurality of ANA group descriptors.

8. The apparatus of claim 7 wherein the at least one processing device is further configured to increment the count for different instances of the respective ones of the plurality of ANA group descriptors received by the storage system in response to different ones of the one or more requests.

9. The apparatus of claim 1 wherein said at least one processing device comprises at least one multi-path input-output driver implemented in the host device and configured to control delivery of the input-output operations to storage devices of the storage system over the selected ones of the plurality of paths through the network.

10. The apparatus of claim 1 wherein the one or more state changes comprise at least one of a removal of a storage device, a replacement of a storage device, an addition of a storage device and an access state change of a storage device.

11. The apparatus of claim 1 wherein the one or more requests are transmitted to the storage system utilizing one or more Non-Volatile Memory Express (NVMe) protocol commands.

12. The apparatus of claim 11 wherein the one or more NVMe protocol commands comprise a Get Log Page command.

13. A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code, when executed by at least one processing device comprising a processor coupled to a memory, causes the at least one processing device:

to control delivery of input-output operations from a host device to a storage system over selected ones of a plurality of paths through a network;

to send one or more requests to the storage system for data corresponding to states of a plurality of storage devices in the storage system;

wherein the one or more requests comprise a directive that the data corresponding to the states returned by the storage system relate to changes in the states of the plurality of storage devices;

to receive the data corresponding to the states from the storage system;

to identify one or more state changes of one or more of the plurality of storage devices based on the received data; and

to manage one or more of the input-output operations responsive to the identified one or more state changes.

14. The computer program product of claim 13 wherein the plurality of storage devices are divided into a plurality of groups, the plurality of groups comprising respective ones of a plurality of asymmetric namespace access (ANA) groups.

15. The computer program product of claim 14 wherein:

the data corresponding to the states from the storage system comprises a plurality of ANA group descriptors for respective ones of the plurality of ANA groups; and

each of the plurality ANA group descriptors indicates a change in data associated with the ANA group descriptor from a previous instance of the ANA group descriptor responsive to the directive that the data corresponding to the states returned by the storage system relate to changes in the states of the plurality of storage devices.

16. The computer program product of claim 14 wherein:

the data corresponding to the states from the storage system comprises a plurality of ANA group descriptors for respective ones of the plurality of ANA groups; and

the program code further causes the at least one processing device to maintain a count of changes in data associated with respective ones of the plurality of ANA group descriptors.

17. A method comprising:

controlling delivery of input-output operations from a host device to a storage system over selected ones of a plurality of paths through a network;

sending one or more requests to the storage system for data corresponding to states of a plurality of storage devices in the storage system;

wherein the one or more requests comprise a directive that the data corresponding to the states returned by the storage system relate to changes in the states of the plurality of storage devices;

receiving the data corresponding to the states from the storage system;

identifying one or more state changes of one or more of the plurality of storage devices based on the received data; and

managing one or more of the input-output operations responsive to the identified one or more state changes.

18. The method of claim 17 wherein the plurality of storage devices are divided into a plurality of groups, the plurality of groups comprising respective ones of a plurality of asymmetric namespace access (ANA) groups.

19. The method of claim 18 wherein:

the data corresponding to the states from the storage system comprises a plurality of ANA group descriptors for respective ones of the plurality of ANA groups; and

each of the plurality ANA group descriptors indicates a change in data associated with the ANA group descriptor from a previous instance of the ANA group descriptor responsive to the directive that the data corresponding to the states returned by the storage system relate to changes in the states of the plurality of storage devices.

20. The method of claim 18 wherein:

the data corresponding to the states from the storage system comprises a plurality of ANA group descriptors for respective ones of the plurality of ANA groups; and

the method further comprises maintaining a count of changes in data associated with respective ones of the plurality of ANA group descriptors.

Assignments (9)

Cited By (1)

US 12,189,957