Power loss protection based on write requirements

Patent metadata

Field	Value
Publication number	US-11947795-B2
Application number	US-202217865854-A
Country	US
Kind code	B2
Filing date	Jul 15, 2022
Priority date	Dec 12, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A storage system and related method are for operating solid-state storage memory in a storage system. Zones of solid-state storage memory are provided. Each zone includes a portion of the solid-state storage memory. The zone has a data write requirement for the zone for reliability of data reads. The storage system adjusts power loss protection for at least one zone. The adjusting is based on the data write requirement for the zone and responsive to detecting a power loss.

First claim

What is claimed is:

1. A method, comprising:
tracking whether each zone of a plurality of zones of solid-state storage memory is an open zone having one or more non-durable data segments or a closed zone having one or more durable data segments, each zone comprising a portion of the solid-state storage memory and having a data write requirement associated with respective zone for reliability of data reads;
adjusting power loss protection for at least one zone, based on the data write requirement for the at least one zone and a current allocation of credits for power loss protection of the zones;
determining whether a power loss has occurred; and
in response to determining that a power loss has occurred, fulfilling data write requirements for the plurality of zones.

2. The method of claim 1 , wherein adjusting the power loss protection for the at least one zone comprises:
closing each open segment of the solid-state storage memory in a zone that has power loss protection activated, responsive to the detecting the power loss.

3. The method of claim 1 , further comprising:
adjusting the current allocation of credits for the power loss protection of the zones.

4. The method of claim 3 , wherein adjusting the current allocation of credits comprises:
issuing one or more credits for activating power loss protection for one or more zones.

5. The method of claim 3 , wherein adjusting the current allocation of credits comprises:
revoking a credit that was issued and applied in activating the power loss protection for a zone, to deactivate power loss protection for the zone.

6. The method of claim 1 , wherein providing the plurality of zones comprises:
issuing the credits for the power loss protection of the zones, wherein an amount of the credits is based on amount of cache memory for data transfers to the solid-state storage memory during power loss.

7. The method of claim 1 , further comprising:
determining the current allocation of credits for the power loss protection of the zones, based on determination of available time duration for power loss support as a dynamic determination over a life span of the solid-state storage memory.

8. The method of claim 1 , further comprising:
tracking how many zones having power loss protection enabled that a garbage collection process is allowed to use.

9. The method of claim 1 , further comprising:
defining zones as each zone is written with data writes.

10. The method of claim 1 , further comprising:
tracking open zones of the plurality of zones to limit an amount of open zones to have power loss protection enabled in accordance with available amount of power loss support.

11. The method of claim 1 , further comprising:
providing the credits for power loss protection, with each of a plurality of processes, each of the plurality of processes arranged to hold or apply one or more of the credits.

12. The method of claim 1 , further comprising:
performing garbage collection in the solid-state storage memory, with an amount of open zones having power loss protection enabled limited based on available amount of power loss support.

13. A non-transitory computer-readable media having instructions thereupon which, when executed by a processor, cause the processor to perform a method comprising:
tracking whether each zone of a plurality of zones of solid state memory is an open zone having one or more non-durable data segments or a closed zone having one or more durable data segments, each zone comprising a portion of the solid-state storage memory and having a data write requirement associated with respective zone for reliability of data reads;
adjusting power loss protection for at least one zone, based on the data write requirement for the at least one zone and a current allocation of credits for power loss protection of the zones;
determining whether a power loss has occurred; and
in response to determining that a power loss has occurred, fulfilling data write requirements for the plurality of zones.

14. The non-transitory computer-readable media of claim 13 , the method further comprising:
adjusting the current allocation of credits for the power loss protection of the zones.

15. The non-transitory computer-readable media of claim 14 , wherein adjusting the current allocation of credits comprises:
issuing one or more credits for activating power loss protection for one or more zones.

16. The non-transitory computer-readable media of claim 14 , wherein adjusting the current allocation of credits comprises:
revoking a credit that was issued and applied in activating power loss protection for a zone, to deactivate the power loss protection for the zone.

17. A storage system, comprising:
solid-state storage memory having a plurality of zones, each zone comprising a portion of the solid-state storage memory having a data write requirement for the zone for reliability of data reads; and
a processing device, to:
tracking whether each zone of the plurality of zones of solid-state storage memory is an open zone having one or more non-durable data segments or a closed zone having one or more durable data segments, each zone comprising a portion of the solid-state storage memory and having a data write requirement associated with respective zone for reliability of data reads;
adjusting power loss protection for at least one zone, based on the data write requirement for the at least one zone and a current allocation of credits for power loss protection of the zones;
determining whether a power loss has occurred; and
in response to determining that a power loss has occurred, fulfilling data write requirements for the plurality of zones.

18. The storage system of claim 17 , the processing device is further to:
adjust the current allocation of credits for the power loss protection of the zones.

19. The storage system of claim 18 , wherein to adjust the current allocation of credits the processing device is further to:
issue one or more credits for activating power loss protection for one or more zones.

20. The storage system of claim 18 , wherein to adjust the current allocation of credits the processing device is further to:
revoke a credit that was issued and applied in activating power loss protection for a zone, to deactivate the power loss protection for the zone.

Assignees

• Pure Storage Inc

Inventors

• Bernat Andrew R
• Davis Brandon
• Mcauliffe Mark L
• Dewitt Zoltan
• Scholbrock Benjamin
• Hord Phillip
• Karr Ronald

Classifications

• G06F3/0604 Primary

  Improving or facilitating administration, e.g. storage management · CPC title

• G06F3/0614

  Improving the reliability of storage systems · CPC title

• G06F3/0653

  Monitoring storage devices or systems · CPC title

• G06F3/0679

  Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP] · CPC title

• G06F12/0253

  Garbage collection, i.e. reclamation of unreferenced memory · CPC title