Method, device, and computer readable storage medium for managing redundant array of independent disks

Patent metadata

Field	Value
Publication number	US-11119705-B2
Application number	US-201916585696-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Oct 26, 2018
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

Techniques manage a redundant array of independent disks. In such a technique, an instruction to expand the RAID is received, the RAID being formed by a first group of storage devices and including a first group of RAID extents. A second group of RAID extents created on a second group of storage devices and logical units are created on the second group of RAID extents. In response to receiving an indication for a failure of the creation of the second group of RAID extents or the logical units, a notification is generated for indicating a failure of the expansion of the RAID without triggering a shuffling operation, the shuffling operation causing storage extents in the first and second groups of RAID extents to be distributed in the first and second groups of storage devices.

First claim

We claim:

1. A method of managing a redundant array of independent disks (RAID), comprising:
receiving an instruction to expand the RAID, the RAID being formed by a first group of storage devices and comprising a first group of RAID extents;
creating, by a control path in response to receipt of the instruction to expand the RAID, a second group of RAID extents on a second group of storage devices and logical units on the second group of RAID extents;
in response to receiving, from the RAID by the control path, an indication for a failure of the creation of the second group of RAID extents or the logical units, generating, by the control path, a notification for indicating a failure of the expansion of the RAID without the control path triggering a shuffling operation, the shuffling operation causing storage extents in the first and second groups of RAID extents to be evenly distributed in the first and second groups of storage devices; and
wherein the indication for the failure of the creation of the second group of RAID extents or the logical units on the second group of RAID extents comprises an indication of a timeout occurring when the RAID does not become ready within a predetermined time period after creation of the second group of RAID extents.

2. The method of claim 1 , further comprising:
receiving a rollback instruction; and
in response to receiving the rollback instruction, deleting logic units and RAID extents that have been created on the second group of storage devices.

3. The method of claim 2 , further comprising:
in response to receiving a notification that the logic units and the RAID extents that have been created are deleted, sending a notification for indicating completion of the rollback.

4. The method of claim 1 , further comprising:
in response to receiving an indication that the second group of RAID extents and the logical units are successfully created, triggering the shuffling operation.

5. A device for managing a redundant array of independent disks (RAID), comprising:
a processing unit;
a memory coupled to the processing unit and comprising instructions stored thereon, the instructions, when executed by the processing unit, causing the device to perform acts comprising:
receiving an instruction to expand the RAID, the RAID being formed by a first group of storage devices and comprising a first group of RAID extents;
creating, by a control path in response to receipt of the instruction to expand the RAID, a second group of RAID extents on a second group of storage devices and logical units on the second group of RAID extents;
in response to receiving, from the RAID by the control path, an indication for a failure of the creation of the second group of RAID extents or the logical units, generating, by the control path, a notification for indicating a failure of the expansion of the RAID without the control path triggering a shuffling operation, the shuffling operation causing storage extents in the first and second groups of RAID extents to be evenly distributed in the first and second groups of storage devices; and
wherein the indication for the failure of the creation of the second group of RAID extents or the logical units on the second group of RAID extents comprises an indication of a timeout occurring when the RAID does not become ready within a predetermined time period after creation of the second group of RAID extents.

6. The device of claim 5 , wherein the acts further comprise:
receiving a rollback instruction; and
in response to receiving the rollback instruction, deleting logic units and RAID extents that have been created on the second group of storage devices.

7. The device of claim 6 , wherein the acts further comprise:
in response to receiving a notification that the logic units and the RAID extents that have been created are deleted, sending a notification for indicating completion of the rollback.

8. The device of claim 5 , wherein the acts further comprise:
in response to receiving an indication that the second group of RAID extents and the logical units are successfully created, triggering the shuffling operation.

9. A computer program product having a non-transitory computer readable medium which stores a set of instructions to managing a redundant array of independent disks (RAID); the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
receiving an instruction to expand the RAID, the RAID being formed by a first group of storage devices and comprising a first group of RAID extents;
creating, by a control path in response to receipt of the instruction to expand the RAID, a second group of RAID extents on a second group of storage devices and logical units on the second group of RAID extents;
in response to receiving, from the RAID by the control path, an indication for a failure of the creation of the second group of RAID extents or the logical units, generating, by the control path, a notification for indicating a failure of the expansion of the RAID without the control path triggering a shuffling operation, the shuffling operation causing storage extents in the first and second groups of RAID extents to be evenly distributed in the first and second groups of storage devices; and
wherein the indication for the failure of the creation of the second group of RAID extents or the logical units on the second group of RAID extents comprises an indication of a timeout occurring when the RAID does not become ready within a predetermined time period after creation of the second group of RAID extents.

10. The method of claim 1 , wherein the control path delays performing the shuffling operation until it receives at least one response from the RAID indicating that the second group of RAID extents and logical units on the second group of RAID extents have been created successfully.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Liu Qingyun
• Gao Jian
• Sun Tianshu
• Xia Sihang
• Feng Changyu

Classifications

• G06F3/0604

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

• G06F3/0631

  by allocating resources to storage systems · CPC title

• G06F3/0689 Primary

  Disk arrays, e.g. RAID, JBOD · CPC title

• G06F3/0632 Primary

  by initialisation or re-initialisation of storage systems · CPC title