Method, device and computer program products for storage management

Patent metadata

Field	Value
Publication number	US-2021286676-A1
Application number	US-202017021275-A
Country	US
Kind code	A1
Filing date	Sep 15, 2020
Priority date	Mar 12, 2020
Publication date	Sep 16, 2021
Grant date	—

Abstract

Techniques involve: determining, according to a determination that a performance level of a target storage unit is lower than a threshold level, whether idle disk slices that can be used for reconstructing malfunctioning disk slices in the target storage unit exist in a slice pool; determining a priority of the target storage unit according to a determination that the idle disk slices do not exist; and selecting replacing disk slices for reconstructing the malfunctioning disk slices from available storage units based at least in part on the priority, wherein the available storage units have performance levels not lower than the threshold level. In this way, data loss due to the off-line of storage units is prevented; and meanwhile, the performance of the entire storage system can be globally stabilized.

First claim

1 . A method for storage management, comprising:
determining, according to a determination that a performance level of a target storage unit is lower than a threshold level, whether idle disk slices that can be used for reconstructing malfunctioning disk slices in the target storage unit exist in a slice pool; determining a priority of the target storage unit according to a determination that the idle disk slices do not exist; and selecting replacing disk slices for reconstructing the malfunctioning disk slices from available storage units based at least in part on the priority, wherein the available storage units have performance levels not lower than the threshold level.

2 . The method according to claim 1 , wherein determining a priority of the target storage unit comprises:
determining a type of data stored in the target storage unit; and determining the priority of the target storage unit based on the type.

3 . The method according to claim 1 , wherein selecting the replacing disk slices comprises:
determining candidate storage units from the available storage units according to a determination that the priority of the target storage unit exceeds a threshold priority, wherein priorities of the candidate storage units do not exceed the threshold priority; determining disks associated with disk slices in the target storage unit other than the malfunctioning disk slices; and selecting, from the candidate storage units, disk slices that do not belong to the disks as the replacing disk slices.

4 . The method according to claim 1 , wherein selecting the replacing disk slices comprises:
determining candidate storage units from the available storage units according to a determination that the priority of the target storage unit does not exceed a threshold priority and based on a construction type of the target storage unit and the number of the malfunctioning disk slices, wherein priorities of the candidate storage units do not exceed the threshold priority; determining disks associated with disk slices in the target storage unit other than the malfunctioning disk slices; and selecting, from the candidate storage units, disk slices that do not belong to the disks as the replacing disk slices.

5 . The method according to claim 4 , wherein determining the candidate storage units comprises:
determining, according to that the construction type matches a target type, whether the number of the malfunctioning disk slices exceeds a threshold number; and determining the candidate storage units from the available storage units according to a determination that the number of the malfunctioning disk slices exceeds the threshold number, wherein the candidate storage units are of the construction type.

6 . The method according to claim 1 , further comprising:
acquiring data of disk slices in the storage unit other than the malfunctioning disk slices; and reconstructing the malfunctioning disk slices by using the data to restore data of the malfunctioning disk slices on the replacing disk slices.

7 . An electronic device, comprising:
a processor; and a memory coupled to the processor, wherein the memory stores instructions to be executed, which, when executed by the processor, cause the electronic device to perform actions comprising:
determining, according to a determination that a performance level of a target storage unit is lower than a threshold level, whether idle disk slices that can be used for reconstructing malfunctioning disk slices in the target storage unit exist in a slice pool;
determining a priority of the target storage unit according to a determination that the idle disk slices do not exist; and
selecting replacing disk slices for reconstructing the malfunctioning disk slices from available storage units based at least in part on the priority, wherein the available storage units have performance levels not lower than the threshold level.

8 . The device according to claim 7 , wherein the priority of the target storage unit is determined in the following way:
determining a type of data stored in the target storage unit; and determining the priority of the target storage unit based on the type.

9 . The device according to claim 7 , wherein the replacing disk slices are selected in the following way:
determining candidate storage units from the available storage units according to a determination that the priority of the target storage unit exceeds a threshold priority, wherein priorities of the candidate storage units do not exceed the threshold priority; determining disks associated with disk slices in the target storage unit other than the malfunctioning disk slices; and selecting, from the candidate storage units, disk slices that do not belong to the disks as the replacing disk slices.

10 . The device according to claim 7 , wherein the replacing disk slices are selected in the following way:
determining candidate storage units from the available storage units according to a determination that the priority of the target storage unit does not exceed a threshold priority and based on a construction type of the target storage unit and the number of the malfunctioning disk slices, wherein priorities of the candidate storage units do not exceed the threshold priority; determining disks associated with disk slices in the target storage unit other than the malfunctioning disk slices; and selecting, from the candidate storage units, disk slices that do not belong to the disks as the replacing disk slices.

11 . The device according to claim 10 , wherein the candidate storage units are determined in the following way:
determining, according to that the construction type matches a target type, whether the number of the malfunctioning disk slices exceeds a threshold number; and determining the candidate storage units from the available storage units according to a determination that the number of the malfunctioning disk slices exceeds the threshold number, wherein the candidate storage units are of the construction type.

12 . The device according to claim 7 , wherein the actions further comprise:
acquiring data of disk slices in the storage unit other than the malfunctioning disk slices; and reconstructing the malfunctioning disk slices by using the data to restore data of the malfunctioning disk slices on the replacing disk slices.

13 . A computer program product having a non-transitory computer readable medium which stores a set of instructions to perform storage management; the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
determining, according to a determination that a performance level of a target storage unit is lower than a threshold level, whether idle disk slices that can be used for reconstructing malfunctioning disk slices in the target storage unit exist in a slice pool; determining a priority of the target storage unit according to a determination that the idle disk slices do not exist; and selecting replacing disk slices for reconstructing the malfunctioning disk slices from available storage units based at least in part on the priority, wherein the available storage units have performance levels not lower than the threshold level.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Zhuo Baote
• Ma Chun
• Gao Hongpo
• Dong Jibing
• Kang Jianbin
• Gao Jian

Classifications

• G06F3/0688

  Non-volatile semiconductor memory arrays · CPC title

• G06F3/0604

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

• G06F11/3409 Primary

  for performance assessment · CPC title

• 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

• G06F3/0665

  at area level, e.g. provisioning of virtual or logical volumes · CPC title