Control method of disk failure, electronic device and computer readable storage medium

Patent metadata

Field	Value
Publication number	US-11314581-B2
Application number	US-202016880154-A
Country	US
Kind code	B2
Filing date	May 21, 2020
Priority date	Oct 21, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Techniques for disk failure control involve determining the number of failed disks in a Redundant Array of Independent Disks (RAID). The techniques further involve comparing the number of failed disks with a predetermined threshold; and in accordance with a determination that the number of failed disks exceeds the predetermined threshold, setting at least one non-failing disk in the RAID into a protection mode to prevent the at least one non-failing disk from being disconnected. Such techniques facilitate prevention of the user data loss in the RAID.

First claim

We claim:

1. A method for disk failure control, comprising:
determining the number of failed disks in a Redundant Array of Independent Disks (RAID);
comparing the number of failed disks with a predetermined threshold; and
in accordance with a determination that the number of failed disks exceeds the predetermined threshold, setting at least one non-failing disk in the RAID into a protection mode to prevent the at least one non-failing disk from being disconnected;
wherein all disks in the RAID are mechanically unlocked from a disk frame during RAID operation to enable disconnection prior to setting the at least one non-failing disk in the RAID into the protection mode; and
wherein the at least one non-failing disk in the RAID is mechanically locked to the disk frame after setting the at least one non-failing disk in the RAID into the protection mode.

2. The method according to claim 1 , wherein determining the number of failed disks in the RAID comprises:
detecting respective states of a plurality of disks comprised in the RAID; and
determining the number of failed disks in the RAID based on the detected respective states of the plurality of disks.

3. The method according to claim 2 , wherein determining the number of failed disks in the RAID based on the detected respective states of the plurality of disks comprises:
determining a first number of disks in a disconnected state and a second number of disks in an unhealthy state based on the respective states of the plurality of disks; and
determining the number of failed disks in the RAID by summing the first number and the second number.

4. The method according to claim 1 , wherein setting the at least one non-failing disk into the protection mode comprises:
controlling a mechanical locking mechanism to lock the at least one non-failing disk in its mounting position, to prevent the at least one non-failing disk from being disconnected.

5. The method according to claim 1 , wherein setting the at least one non-failing disk into the protection mode comprises:
providing an indication mark associated with the at least one non-failing disk to remind a user of avoiding disconnection of the at least one non-failing disk.

6. The method according to claim 1 , further comprising:
in accordance with a determination that at least one of the failed disks has been rebuilt with a new disk, updating the number of failed disks in the RAID after the rebuilding;
in accordance with a determination that the updated number fails to exceed the predetermined threshold, causing the at least one non-failing disk to exit from the protection mode; and
in accordance with a determination that the updated number exceeds the predetermined threshold, setting the new disk into the protection mode to prevent the new disk from being disconnected.

7. The method according to claim 6 , wherein causing the at least one non-failing disk to exit from the protection mode comprises:
in accordance with a determination that the at least one non-failing disk is locked by a mechanical locking mechanism in its mounting position in the protection mode, controlling the mechanical locking mechanism to unlock the at least one non-failing disk; and
in accordance with a determination that an indication mark associated with the at least one non-failing disk is provided in the protection mode, ceasing the provision of the indication mark.

8. An electronic device, comprising:
at least one processing unit; and
at least one memory coupled to the at least one processing unit and storing instructions executable by the at least one processing unit, the instructions, when executed by the at least one processing unit, causing the electronic device to perform acts comprising:
determining the number of failed disks in a Redundant Array of Independent Disks (RAID);
comparing the number of failed disks with a predetermined threshold; and
in accordance with a determination that the number of failed disks exceeds the predetermined threshold, setting at least one non-failing disk in the RAID into a protection mode to prevent the at least one non-failing disk from being disconnected;

wherein all disks in the RAID are mechanically unlocked from a disk frame during RAID operation to enable disconnection prior to setting the at least one non-failing disk in the RAID into the protection mode; and
wherein the at least one non-failing disk in the RAID is mechanically locked to the disk frame after setting the at least one non-failing disk in the RAID into the protection mode.

9. The electronic device according to claim 8 , wherein determining the number of failed disks in the RAID comprises:
detecting respective states of a plurality of disks comprised in the RAID; and
determining the number of failed disks in the RAID based on the detected respective states of the plurality of disks.

10. The electronic device according to claim 9 , wherein determining the number of failed disks in the RAID based on the detected respective states of the plurality of disks comprises:
determining a first number of disks in a disconnected state and a second number of disks in an unhealthy state based on the respective states of the plurality of disks; and
determining the number of failed disks in the RAID by summing the first number and the second number.

11. The electronic device according to claim 8 , wherein setting the at least one non-failing disk into the protection mode comprises:
controlling a mechanical locking mechanism to lock the at least one non-failing disk in its mounting position, to prevent the at least one non-failing disk from being disconnected.

12. The electronic device according to claim 8 , wherein setting the at least one non-failing disk into the protection mode comprises:
providing an indication mark associated with the at least one non-failing disk to remind a user of avoiding disconnection of the at least one non-failing disk.

13. The electronic device according to claim 8 , wherein the acts further comprise:
in accordance with a determination that at least one of the failed disks has been rebuilt with a new disk, updating the number of failed disks in the RAID after the rebuilding;
in accordance with a determination that the updated number fails to exceed the predetermined threshold, causing the at least one non-failing disk to exit from the protection mode; and
in accordance with a determination that the updated number exceeds the predetermined threshold, setting the new disk into the protection mode to prevent the new disk from being disconnected.

14. The electronic device according to claim 13 , wherein causing the at least one non-failing disk to exit from the protection mode comprises:
in accordance with a determination that the at least one non-failing disk is locked by a mechanical locking mechanism in its mounting position in the protection mode, controlling the mechanical locking mechanism to unlock the at least one non-failing disk; and
in accordance with a determination that an indication mark associated with the at least one non-failing disk is provided in the protection mode, ceasing the provision of the indication mark.

15. A computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, causing the processor to perform acts comprising:
determining the number of failed disks in a Redundant Array of Independent Disks (RAID);
comparing the number of failed disks with a predetermined threshold; and
in accordance with a determination that the number of failed disks exceeds the predetermined threshold, setting

Assignees

• Emc Ip Holding Co Llc

Inventors

• Li Chenglin
• Luo Mingyi
• Zeng Hongyuan
• Zhang Ruiyang

Classifications

• G06F11/0727

  in a storage system, e.g. in a DASD or network based storage system (drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097) · CPC title

• G06F11/076

  by exceeding a count or rate limit, e.g. word- or bit count limit · CPC title

• G06F11/0793 Primary

  Remedial or corrective actions (recovery from an exception in an instruction pipeline G06F9/3861; by retry G06F11/1402; for recovering from a failure of a protocol instance or entity H04L69/40) · CPC title

• G11B17/022

  Positioning or locking of single discs · CPC title

• G06F11/1084 Primary

  Degraded mode, e.g. caused by single or multiple storage removals or disk failures · CPC title