Prioritization of stored data during a delete process in a virtualized storage system

1. A method comprising:

receiving, by one or more processors, a host input/output write operation, wherein the host input/output write operation includes host metadata regarding data represented by the host input/output write operation;

storing, by the one or more processors, the host input/output write operation in one or more physical storage data units;

assigning, by the one or more processors, a priority to the one or more physical storage data units;

in response to receiving a host volume delete command associated with at least one of the one or more physical storage data units, prioritizing, by the one or more processors, data units of the host volume for deletion based, at least in part, on the assigned priority of the data units of the host volume, wherein data units with a higher priority are soft-deleted; and

in response to receiving a restore host volume command for a soft-deleted data unit, restoring, by the one or more processors, the soft-deleted data-unit based on the host metadata.

2. The method of claim 1 , wherein the host input/output write operation includes a flag attached to the write operation by the host application.

3. The method of claim 1 , wherein the priority of the one or more physical storage data units includes storing a priority label in an internal physical data address mapping of a storage controller.

4. The method of claim 3 , wherein the higher priority labeled data units are compacted together as an extent in response to the volume delete command.

5. The method of claim 4 , wherein the delete process includes hard-deleting compacted extents of a volume that are a lower priority than soft deleted extents of the volume.

6. The method of claim 1 , wherein host metadata includes metadata relating to the host file system structure.

7. A computer program product comprising:

one or more computer-readable storage media and program instructions stored on the one or more computer-readable storage media, the program instructions comprising:

program instructions to receive a host input/output write operation, wherein the host input/output write operation includes host metadata regarding data represented by the host input/output write operation;

program instructions to store the host input/output write operation in one or more physical storage data units;

program instructions to assign a priority to the one or more physical storage data units;

in response to receiving a host volume delete command associated with at least one of the one or more physical storage data units, program instructions to prioritize data units of the host volume for deletion based, at least in part, on the assigned priority of the data units of the host volume, wherein data units with a higher priority are soft-deleted; and

in response to receiving a restore host volume command for a soft-deleted data unit, program instructions to restore the soft-deleted data-unit based on the host metadata.

8. The computer program product of claim 7 , wherein the host input/output write operation includes a flag attached to the write operation by the host application.

9. The computer program product of claim 7 , wherein the priority of the one or more physical storage data units includes storing a priority label in an internal physical data address mapping of a storage controller.

10. The computer program product of claim 9 , wherein the higher priority labeled data units are compacted together as an extent in response to the volume delete command.

11. The computer program product of claim 10 , wherein the delete process includes hard-deleting compacted extents of a volume that are a lower priority than soft deleted extents of the volume.

12. The computer program product of claim 7 , wherein host metadata includes metadata relating to the host file system structure.

13. A computer system comprising:

one or more computer processors;

one or more computer readable storage media; and

program instructions stored on the computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:

program instructions to receive a host input/output write operation, wherein the host input/output write operation includes host metadata regarding data represented by the host input/output write operation;

program instructions to store the host input/output write operation in one or more physical storage data units;

program instructions to assign a priority to the one or more physical storage data units;

in response to receiving a host volume delete command associated with at least one of the one or more physical storage data units, program instructions to prioritize data units of the host volume for deletion based, at least in part, on the assigned priority of the data units of the host volume, wherein data units with a higher priority are soft-deleted; and

in response to receiving a restore host volume command for a soft-deleted data unit, program instructions to restore the soft-deleted data-unit based on the host metadata.

14. The computer system of claim 13 , wherein the host input/output write operation includes a flag attached to the write operation by the host application.

15. The computer system of claim 13 , wherein the priority of the one or more physical storage data units includes storing a priority label in an internal physical data address mapping of a storage controller.

16. The computer system of claim 15 , wherein the higher priority labeled data units are compacted together as an extent in response to the volume delete command.

17. The computer system of claim 16 , wherein the delete process includes hard-deleting compacted extents of a volume that are a lower priority than soft deleted extents of the volume.