System and device for data recovery for ephemeral storage

Patent metadata

Field	Value
Publication number	US-12399782-B2
Application number	US-202318134438-A
Country	US
Kind code	B2
Filing date	Apr 13, 2023
Priority date	Jul 13, 2020
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

In various embodiments, a method for page cache management is described. The method can include: identifying a storage device fault associated with a fault-resilient storage device; determining that a first region associated with the fault-resilient storage device comprises an inaccessible space and that a second region associated with the fault-resilient storage device comprises an accessible space; identifying a read command at the second storage device for the data and determine, based on the read command, first data requested by a read operation from a local memory of the second storage device; determining, based on the read command, second data requested by the read operation from the second region; retrieving the second data from the second region; and scheduling a transmission of the second data from the fault-resilient storage device to the second storage device.

First claim

What is claimed is:

1. A method comprising:
identifying a state associated with a first storage device;
based on identifying the state:
determining that a first region associated with the first storage device is associated with a first attribute, and that a second region associated with the first storage device is associated with a second attribute;
identifying, at a second storage device, a first read command for first data;
identifying, based on the first read command, that the first data is stored in the first storage device;
based on identifying that the first data is stored in the first storage device:
determining that the first data is stored in the first region or the second region;
based on determining that the first data is stored in the first region, returning a first response to the first read command; and
based on determining that the first data is stored in the second region, returning a second response to the first read command.

2. The method of claim 1 , wherein the method further comprises:
identifying a second read command;
identifying, based on the second read command, second data stored in the first region of the first storage device; and
returning a message based on the identifying of the second data in the first region.

3. The method of claim 1 , further comprising:
identifying a write command;
writing at least a portion of second data to a cache of a computing device;
determining that the portion of the second data is associated with a third attribute; and
writing the second data to a persistent memory of the second storage device based on the determining that the portion of the second data is associated with the third attribute.

4. The method of claim 3 , wherein the third attribute includes identification of an association of the second data with the first region of the first storage device.

5. The method of claim 1 further comprising:
transmitting the first data from the first storage device to the second storage device.

6. The method of claim 1 , wherein the first attribute includes identification of first accessibility of the first region by a computing device, and the second attribute includes identification of second accessibility of the second region by the computing device.

7. The method of claim 1 , wherein the first data is associated with at least one virtual machine of a computing device.

8. The method of claim 1 , wherein the state includes a mode of operation of the first storage device.

9. The method of claim 8 , wherein the mode of operation includes at least one of a read-only mode, or a partial read-only mode.

10. A device comprising:
at least one memory device that stores computer-executable instructions; and
at least one processor configured to access the at least one memory device, wherein the at least one processor is configured to execute the computer-executable instructions to:
identify a state associated with a first storage device;
based on the processor being configured to identify the state, the processor is further configured to:
determine that a first region associated with the first storage device is associated with a first attribute, and that a second region associated with the first storage device is associated with a second attribute;
identify, at a second storage device, a first read command for first data;
identify, based on the first read command, that the first data is stored in the first storage device;
based on the processor being configured to identify that the first data is stored in the first storage device:
determine that the first data is stored in the first region or the second region;
based on the processor being configured to determine that the first data is stored in the first region, return a first response to the first read command; and
based on the processor being configured to determine that the first data is stored in the second region, return a second response to the first read command.

11. The device of claim 10 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
identify a second read command;
identify, based on the second read command, second data stored in the first region of the first storage device; and
return a message based on the processor being configured to identify the second data in the first region.

12. The device of claim 10 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
identify a write command;
write at least a portion of second data to a cache of a computing device;
determine that the portion of the second data is associated with a third attribute; and
write the second data to a persistent memory of the second storage device based on the at least one processor being configured to execute the computer-executable instructions to determine that the portion of the second data is associated with the third attribute.

13. The device of claim 12 , wherein the third attribute includes identification of an association of the second data with the first region of the first storage device.

14. The device of claim 10 , wherein the at least one processor is configured to execute computer-executable instructions to transmit the first data from the first storage device to the second storage device.

15. The device of claim 10 , wherein the first attribute includes identification of first accessibility of the first region by a computing device, and the second attribute includes identification of second accessibility of the second region by the computing device.

16. The device of claim 10 , wherein the state includes a mode of operation of the first storage device.

17. The device of claim 16 , wherein the mode of operation includes at least one of a read-only mode, or a partial read-only mode.

18. A non-transitory computer-readable medium storing computer-executable instructions which, when executed by a processor, cause the processor to perform operations comprising:
identifying a state associated with a first storage device;
based on identifying the state:
determining that a first region associated with the first storage device is associated with a first attribute, and that a second region associated with the first storage device is associated with a second attribute;
identifying a first read command for first data at a second storage device;
identifying, based on the first read command, that the first data is stored in the first storage device;
based on identifying that the first data is stored in the first storage device:
determining that the first data is stored in the first region or the second region;
based on determining that the first data is stored in the first region, returning a first response to the first read command; and
based on determining that the first data is stored in the second region, returning a second response to the first read command.

19. The non-transitory computer-readable medium of claim 18 , wherein the state includes a mode of operation of the first storage device.

20. The non-transitory computer-readable medium of claim 18 , wherein the first attribute includes identification of first accessibility of the first region by a computing device, and the second attribute includes identification of second accessibility of the second region by the computing device.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Ki Yang Seok
• Ryu Sungwook

Classifications

• G06F12/0882

  Page mode · CPC title

• G06F11/3037

  where the computing system component is a memory, e.g. virtual memory, cache (accessing, addressing or allocating within memory systems or architectures G06F12/00; checking stores for correct operation G11C29/00) · CPC title

• G06F11/203

  using migration · CPC title

• G06F11/1484

  involving virtual machines · CPC title

• G06F11/1068

  in sector programmable memories, e.g. flash disk (G06F11/1072 takes precedence) · CPC title