Volume admission control for high-performance distributed data storage system

1. A method of registering new storage volumes to a data storage environment comprising a plurality of storage nodes, the method comprising:

receiving a request to register a new storage volume to a subcluster of one or more storage nodes, wherein quality of service (QOS) parameters specify one or more I/O operations per second (IOPS) requirements for the new storage volume;

determining whether an IOPS capacity of the subcluster is sufficient to accommodate addition of the IOPS requirement for the new storage volume; and

if the TOPS capacity of the subcluster is sufficient, registering the new storage volume to the subcluster,

wherein determining whether an IOPS capacity of the subcluster is sufficient comprises adjusting the IOPS capacity of the subcluster by a replication factor indicative of a number of times storage volumes on the subcluster are replicated on the subcluster.

2. The method of claim 1 , wherein the QOS parameters for the new storage volume are specified in service level agreements for the storage volumes.

3. The method of claim 1 , wherein the QOS parameters for the new storage volume comprise I/O priority for the storage volume.

4. The method of claim 1 , wherein the QOS parameters for the new storage volume comprise a minimum IOPS requirement for the new storage volume.

5. The method of claim 1 , wherein the QOS parameters for the new storage volume comprise a maximum TOPS requirement for the new storage volume.

6. The method of claim 1 , wherein determining whether an IOPS capacity of the subcluster is sufficient comprises determining whether an IOPS capacity of the subcluster is sufficient to support minimum IOPS requirements for all existing storage volumes on the subcluster plus a minimum IOPS requirement for the new storage volume.

7. The method of claim 6 , wherein determining whether an IOPS capacity of the subcluster is sufficient further comprises adjusting the TOPS capacity of the subcluster by a loading factor.

8. The method of claim 7 , wherein at least one of the minimum IOPS requirements for the storage volumes are soft requirements and the loading factor is greater than 1.

9. The method of claim 7 , wherein the loading factor is less than 1.

10. The method of claim 7 , wherein the loading factor is in a range from 0.5-0.75.

11. The method of claim 1 , wherein determining whether an IOPS capacity of the subcluster is sufficient comprises determining whether an IOPS capacity of the subcluster is sufficient to support maximum IOPS requirement for all existing storage volumes on the subcluster plus a maximum IOPS requirement for the new storage volume.

12. The method of claim 11 , wherein determining whether an IOPS capacity of the subcluster is sufficient further comprises adjusting the maximum IOPS requirement for storage volumes by a burst factor indicative of burstiness of I/O activity on the subcluster.

13. The method of claim 11 wherein the burst factor is in a range from 0.3-0.4.

14. The method of claim 11 , wherein the burst factor is adapted over time based on actual burstiness of I/O activity on the subcluster.

15. The method of claim 1 , wherein the replication factor is adapted over time based on actual replications on the subcluster.

16. The method of claim 1 , further comprising:

providing a notification if the IOPS capacity of the subcluster is not sufficient.

17. The method of claim 1 , further comprising:

if the TOPS capacity of the subcluster is not sufficient, then not registering the new storage volume to the subcluster.

18. The method of claim 1 , wherein the request to register a new storage volume is received over a network from an application module.

19. A non-transitory computer-readable storage medium storing computer program modules for registering new storage volumes to a data storage environment comprising a plurality of storage nodes, the computer program modules executable to perform steps comprising:

receiving a request to register a new storage volume to a subcluster of one or more storage nodes, wherein quality of service (QOS) parameters specify one or more I/O operations per second (IOPS) requirements for the new storage volume;

determining whether an IOPS capacity of the subcluster is sufficient to accommodate addition of the IOPS requirement for the new storage volume; and

if the TOPS capacity of the subcluster is sufficient, registering the new storage volume to the subcluster,

wherein determining whether an IOPS capacity of the subcluster is sufficient comprises adjusting the IOPS capacity of the subcluster by a replication factor indicative of a number of times storage volumes on the subcluster are replicated on the subcluster.

20. A data storage environment comprising:

a plurality of application nodes that send application read requests and application write requests for data;

a plurality of storage nodes in communication with the application nodes, the storage nodes for storing the data organized as storage volumes;

an orchestration manager module in communication with the application nodes and the storage nodes, the orchestration manager module configured for:

receiving a request from an application node to register a new storage volume to a subcluster of one or more of the storage nodes, wherein quality of service (QOS) parameters specify one or more I/O operations per second (TOPS) requirements for the new storage volume;

determining whether an TOPS capacity of the subcluster is sufficient to accommodate addition of the TOPS requirement for the new storage volume; and

if the TOPS capacity of the subcluster is sufficient, registering the new storage volume to the subcluster,

wherein determining whether an TOPS capacity of the subcluster is sufficient comprises adjusting the TOPS capacity of the subcluster by a replication factor indicative of a number of times storage volumes on the subcluster are replicated on the subcluster.