Policy based slice deletion in a dispersed storage network

1. A method for execution by a processing system of a dispersed storage network that includes a processor, the method comprises:

determining one or more slice names of one or more slices to consider for deletion;

determining an access policy corresponding to the one or more slices that includes a time varying accessibility pattern;

determining a current timestamp;

determining whether there is no future slice availability for the one or more slices, based on the current timestamp and the access policy;

when there is no future slice availability for the one or more slices:

determining whether reconsideration regarding deletion of the one or more slices is available based on the access policy;

deleting the one or more slices when the reconsideration is determined to be unavailable;

when the reconsideration is determined to be available:

sending a reconsideration request message to a reconsideration entity;

receiving a reconsideration response message in response; and

deleting the one or more slices when the reconsideration response message indicates that the reconsideration is denied.

2. The method of claim 1 , wherein the one or more slice names include one of: a plurality of discrete and non-contiguous slice names, a contiguous range of slice names associated with a common data segment or a contiguous range of slice names associated with a common data object.

3. The method of claim 1 , wherein determining one or more slice names is based on one or more of: where a previous deletion process ended, a starting DSN address, a lookup, a command, a request, a random number, a vault ID, a data object ID, and a local virtual DSN address to a physical location table.

4. The method of claim 1 , wherein determining the access policy includes retrieving the access policy based on the one or more slice names.

5. The method of claim 1 , wherein determining when the reconsideration is available is further based on one or more of: a reconsideration time window, a user device ID, a vault lookup, a command, a predetermination, a DS managing unit message, and the current timestamp.

6. The method of claim 1 , wherein the reconsideration entity is at least one of: a user device, a DST processing unit, a storage integrity processing unit, a managing unit, or a DST execution unit.

7. The method of claim 1 , wherein the time varying accessibility pattern includes a plurality of time frames, and wherein a read threshold of pillars of a vault are only available across at least two time frames.

8. The method of claim 1 , further comprising:

maintaining storage of the one or more slices when the reconsideration response message includes a new access policy corresponding to the one or more slices; and

storing the new access policy.

9. A processing system of a dispersed storage network comprises:

at least one processor;

a memory that stores operational instructions, that when executed by the at least one processor cause the processing system to:

determine one or more slice names of one or more slices to consider for deletion;

determine an access policy corresponding to the one or more slices that includes a time varying accessibility pattern;

determine a current timestamp;

determine whether there is no future slice availability for the one or more slices, based on the current timestamp and the access policy;

when there is no future slice availability for the one or more slices:

determine whether reconsideration regarding deletion of the one or more slices is available based on the access policy;

delete the one or more slices when the reconsideration is determined to be unavailable;

when the reconsideration is determined to be available:

send a reconsideration request message to a reconsideration entity;

receive a reconsideration response message in response; and

delete the one or more slices when the reconsideration response message indicates that the reconsideration is denied.

10. The processing system of claim 9 , wherein the one or more slice names include one of: a plurality of discrete and non-contiguous slice names, a contiguous range of slice names associated with a common data segment or a contiguous range of slice names associated with a common data object.

11. The processing system of claim 9 , wherein determining one or more slice names is based on one or more of: where a previous deletion process ended, a starting DSN address, a lookup, a command, a request, a random number, a vault ID, a data object ID, and a local virtual DSN address to a physical location table.

12. The processing system of claim 9 , wherein determining the access policy includes retrieving the access policy based on the one or more slice names.

13. The processing system of claim 9 , wherein determining when the reconsideration is available is further based on one or more of: a reconsideration time window, a user device ID, a vault lookup, a command, a predetermination, a DS managing unit message, and the current timestamp.

14. The processing system of claim 9 , wherein the reconsideration entity is at least one of: a user device, a DST processing unit, a storage integrity processing unit, a managing unit, or a DST execution unit.

15. The processing system of claim 9 , wherein the time varying accessibility pattern includes a plurality of time frames, and wherein a read threshold of pillars of a vault are only available across at least two time frames.

16. The processing system of claim 9 , wherein the operational instructions, when executed by the at least one processor further cause the processing system to:

maintain storage of the one or more slices when the reconsideration response message includes a new access policy corresponding to the one or more slices; and

store the new access policy.

17. A non-transitory computer readable storage medium comprises:

at least one memory section that stores operational instructions that, when executed by a processing system of a dispersed storage network (DSN) that includes a processor and a memory, causes the processing system to:

determine one or more slice names of one or more slices to consider for deletion;

determine an access policy corresponding to the one or more slices that includes a time varying accessibility pattern;

determine a current timestamp;

determine whether there is no future slice availability for the one or more slices, based on the current timestamp and the access policy;

when there is no future slice availability for the one or more slices:

determine whether reconsideration regarding deletion of the one or more slices is available based on the access policy;

delete the one or more slices when the reconsideration is determined to be unavailable;

when the reconsideration is determined to be available:

send a reconsideration request message to a reconsideration entity

receive a reconsideration response message in response; and

delete the one or more slices when the reconsideration response message indicates that the reconsideration is denied.

18. The non-transitory computer readable storage medium of claim 17 , wherein determining when the reconsideration is available is further based on one or more of: a reconsideration time window, a user device ID, a vault lookup, a command, a predetermination, a DS managing unit message, and the current timestamp.

19. The non-transitory computer readable storage medium of claim 17 , wherein the time varying accessibility pattern includes a plurality of time frames, and wherein a read threshold of pillars of a vault are only available across at least two time frames.

20. The non-transitory computer readable storage medium of claim 17 , wherein the operational instructions, when executed by the processor further cause the processing system to:

maintain storage of the one or more slices when the reconsideration response message includes a new access policy corresponding to the one or more slices; and

store the new access policy.