Method and apparatus, and readable storage medium

Patent metadata

Field	Value
Publication number	US-11237929-B2
Application number	US-202016824259-A
Country	US
Kind code	B2
Filing date	Mar 19, 2020
Priority date	Sep 22, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A redundant array of independent disks (RAID) management method includes, when detecting that a component in a storage medium fails, recovering, based on a RAID policy, data stored in the failed component, saving the recovered data into a pre-defined redundant space of the RAID, and mapping an address of the failed component with the address of the redundant space, converting, according to the mapping, an address of to-be-accessed data comprised in an accessing request into an address within the redundant space, and accessing the to-be-accessed data from the redundant space according to the address within the redundant space.

First claim

What is claimed is:

1. A redundant array of independent disks (RAID) management method, comprising:
recovering data stored in a failed component in a storage medium based on a RAID policy when detecting the failed component in the storage medium;
receiving configuration instructions for a maintenance-free rate and a maintenance-free period based on a requirement;
configuring a pre-defined redundant space of a RAID based on the configuration instructions;
saving the data into the pre-defined redundant space of the RAID;
mapping a first address of the failed component with a second address of the pre-defined redundant space;
converting a third address of to-be-accessed data that is part of an accessing request into a fourth address within the pre-defined redundant space according to the mapping; and
accessing the to-be-accessed data from the pre-defined redundant space according to the fourth address within the pre-defined redundant space.

2. The RAID management method of claim 1 , wherein the configuration instructions are received from a host, wherein the maintenance-free rate and the maintenance-free period are configured for the RAID, and wherein the RAID management method further comprises:
determining a capacity of the pre-defined redundant space that satisfies the maintenance-free rate in the maintenance-free period based on the maintenance-free rate, the maintenance-free period, an annualized failure rate (AFR) of the RAID, and a plurality of components comprised in the RAID; and
configuring the pre-defined redundant space based on the capacity of the pre-defined redundant space.

3. The RAID management method of claim 2 , further comprising:
determining a percentage of the capacity of the pre-defined redundant space in a total capacity of the RAID; and
obtaining a percentage of storage space from each of the components of the RAID to configure the pre-defined redundant space.

4. The RAID management method of claim 2 , further comprising reconfiguring the RAID policy based on a remaining storage space of the RAID after configuring the pre-defined redundant space.

5. The RAID management method of claim 1 , wherein before recovering the data stored in the failed component, the RAID management method further comprises:
querying whether a current capacity of the pre-defined redundant space is larger than or equal to a size of the data stored in the failed component; and
recovering the data stored in the failed component based on the RAID policy when the current capacity of the pre-defined redundant space is larger than or equal to the size of the data stored in the failed component.

6. The RAID management method of claim 1 , wherein before recovering the data stored in the failed component, the RAID management method further comprises:
querying whether a current capacity of the pre-defined redundant space is larger than or equal to a size of the data stored in the failed component;
determining a difference between the current capacity of the pre-defined redundant space and the size of the data stored in the failed component;
making a determination that the current capacity of the pre-defined redundant space is smaller than the size of the data stored in the failed component; and
obtaining, from over-provisioning space of the RAID, storage space in a size of the difference to compensate the pre-defined redundant space based on the determination the pre-defined redundant space is smaller than the size of the data stored in the failed component.

7. The RAID management method of claim 1 , wherein the configuration instructions comprise user input configuration instructions and are received from a host.

8. The RAID management method of claim 1 , further comprising delivering the maintenance-free rate and the maintenance-free period to the storage medium using a configuration instruction to configure or change a maintenance-free parameter of the storage medium.

9. A redundant array of independent disks (RAID) storage device, comprising:
a processor; and
a memory coupled to the processor and storing instructions that, when executed by the processor, cause the RAID storage device to be configured to:
detect a failed component in a storage medium;
recover data stored in the failed component based on a RAID policy when detecting the failed component;
receive configuration instructions for a maintenance-free rate and a maintenance-free period based on a requirement;
configure a pre-defined redundant space of a RAID based on the configuration instructions;
save the data into the pre-defined redundant space of the RAID;
map a first address of the failed component with a second address of the pre-defined redundant space;
convert a third address of to-be-accessed data comprised in an accessing request into a fourth address within the pre-defined redundant space according to the mapping; and
access the to-be-accessed data from the pre-defined redundant space according to the fourth address within the pre-defined redundant space.

10. The RAID storage device of claim 9 , wherein the configuration instructions are received from a host, wherein the maintenance-free rate and the maintenance-free period are configured for the RAID, and wherein the instructions further cause the RAID storage device to be configured to:
determine a capacity of the pre-defined redundant space that satisfies the maintenance-free rate in the maintenance-free period based on the maintenance-free rate, the maintenance-free period, an annualized failure rate (AFR) of the RAID, and a plurality of components comprised in the RAID; and
configure the pre-defined redundant space based on the capacity of the pre-defined redundant space.

11. The RAID storage device of claim 10 , wherein the instructions further cause the RAID storage device to be configured to:
determine a percentage of the capacity of the pre-defined redundant space in a total capacity of the RAID; and
obtain a percentage of storage space from each of the components of the RAID to configure the pre-defined redundant space.

12. The RAID storage device of claim 10 , wherein the instructions further cause the RAID storage device to be configured to reconfigure the RAID policy based on a remaining storage space of the RAID after configuring the pre-defined redundant space.

13. The RAID storage device of claim 9 , wherein the instructions further cause the RAID storage device to be configured to:
query whether a current capacity of the pre-defined redundant space is larger than or equal to a size of the data stored in the failed component; and
recover data stored in the failed component based on the RAID policy when the current capacity of the pre-defined redundant space is larger than or equal to the size of the data stored in the failed component.

14. The RAID storage device of claim 9 , wherein the instructions further cause the RAID storage device to be configured to:
query whether a current capacity of the pre-defined redundant space is larger than or equal to a size of the data stored in the failed component;
determine a difference between the current capacity of the pre-defined redundant space and the size of the data stored in the failed component;
make a determination that the current capacity of the pre-defined redundant space is smaller than the size of the data stored in the failed component; and
obtain, from over-provisioning space of the RAID, storage space in a size of the difference to compensate the pre-defined redundant space based on the determination the current capacity of the pre-defined redundant space is smaller than the size of the data stored in the

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhou Jianhua
• Zhou Meng

Classifications

• G06F11/2094 Primary

  Redundant storage or storage space (G06F11/2056 takes precedence) · CPC title

• G06F11/1612 Primary

  where the redundant component is persistent storage · CPC title

• G06F11/1662

  the resynchronized component or unit being a persistent storage device (re-synchronization of failed mirror storage G06F11/2082; rebuild or reconstruction of parity RAID storage G06F11/1008) · CPC title

• G06F11/16

  Error detection or correction of the data by redundancy in hardware · CPC title

• G06F11/1092

  Rebuilding, e.g. when physically replacing a failing disk · CPC title