Failing back block objects in batch

Patent metadata

Field	Value
Publication number	US-9940207-B2
Application number	US-201615095953-A
Country	US
Kind code	B2
Filing date	Apr 11, 2016
Priority date	Apr 15, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Embodiments of the present disclosure disclose a method, an apparatus and a computer program product for failing back block objects in batch by performing failback operations in batch to part of block objects of one or more of existing file systems; determining a delay time required for performing failback operations in a next batch based on the recorded number of block objects that have been failed back in last batches; and performing the failback operations in the next batch to remaining block objects after the delay time.

First claim

What is claimed is:

1. A method for performing batch failback to a block object, the method comprising:
performing a first plurality of failback operations in a first batch to a part of block objects of a first file system if the first plurality is less than or equal to a threshold;
suspending the first plurality of failback operations in the first batch if the first plurality is greater than the threshold;
determining a delay time required for performing a second plurality of failback operations in a second batch to a part of block objects of a second file system based on the recorded number of block objects that have been failed back in the first batch;
performing the second plurality of failback operations in the second batch after the delay time if a sum of the first and the second pluralities is less than or equal to the threshold; and
suspending the second plurality of failback operations in the second batch if the sum is greater than the threshold.

2. The method according to claim 1 , wherein when a storage processor is booting up, a list of two or more existing file systems is built such that failback operations are performed in a batch on one or more of the existing file systems.

3. The method according to claim 2 , wherein performing failback operations comprises:
traversing the list of existing file systems to locate a current file system, the current file system comprising block objects to be failed back; and
performing failback operations in a batch for a part of block objects on the current file system.

4. The method according to claim 3 , wherein performing failback operations for the block objects further comprises:
suspending the failback operations in the batch based on an amount of file systems being found.

5. The method according to claim 4 , wherein suspending the failback operations further comprises:
comparing an amount of file systems being found with a second threshold; and
suspending the failback operations in the batch when the amount of file systems found is greater than the second threshold.

6. The method according to claim 1 , wherein performing failback operations further comprises:
in a batch, performing failback operations to all block objects on a same file system.

7. The method according to claim 1 , wherein performing failback operations further comprises:
recording an amount of block objects that have already issued failback operations in the batch; and
suspending the failback operations in the batch based on the amount of block objects.

8. The method according to claim 1 , wherein determining the delay time comprises:
recording a first amount of block objects that have already issued failback operations in a latest batch; and
computing a second amount of block objects that have already issued failback operations in latest multiple batches.

9. The method according to claim 8 , wherein determining the delay time further comprises:
computing the delay time required for performing the failback operations in a subsequent batch based on the amount of block objects recorded in the first and second file systems.

10. An apparatus for performing batch failback of block objects, the apparatus comprising:
one or more processors; and
computer-executable logic operating in memory across the one or more processors, wherein the computer-executable program logic is configured to execute the method of claim 1 .

11. The apparatus according to claim 10 , wherein when a storage processor is booting up, a list of two or more existing file systems is built such that failback operations are performed in a batch on one or more of the existing file systems.

12. The apparatus according to claim 11 , wherein the computer-executable program logic is further configured to enable execution of:
traversing the list of existing file systems to locate a current file system, the current file system comprising block objects to be failed back; and
performing failback operations in a batch for a part of block objects on the current file system.

13. The apparatus according to claim 12 , wherein the computer-executable program logic is further configured to enable execution of:
suspending the failback operations in the batch based on an amount of file systems being found.

14. The apparatus according to claim 13 , wherein the computer-executable program logic is further configured to enable execution of:
comparing an amount of file systems being found with a second threshold; and
suspending the failback operations in the batch when the amount of file systems found is greater than the second threshold.

15. The apparatus according to claim 10 , wherein the computer-executable program logic is further configured to enable execution of:
in a batch, performing failback operations to all block objects on a same file system.

16. The apparatus according to claim 10 , wherein the computer-executable program logic is further configured to enable execution of:
recording an amount of block objects that have already issued failback operations in the batch; and
suspending the failback operations in the batch based on the amount of block objects.

17. The apparatus according to claim 10 , wherein the computer-executable program logic is further configured to enable execution of:
recording a first amount of block objects that have already issued failback operations in a latest one batch; and
computing a second amount of block objects that have already issued failback operations in latest multiple batches.

18. A computer program product comprising a non-transitory computer readable medium encoded with computer executable code, wherein the code enables execution across one or more processors for performing the method of claim 1 .

Assignees

• Emc Corp
• Emc Ip Holding Co Llc

Inventors

• Li Jinwei
• Cao Gang
• Wang Walter Lei
• Zhang Matt Zhu
• Ren Ren

Classifications

• G06F11/1471 Primary

  involving logging of persistent data for recovery · CPC title

• G06F2201/81

  Threshold · CPC title

• G06F11/2092

  Techniques of failing over between control units · CPC title

• G06F16/122 Primary

  using management policies (point-in-time backing up or restoration of persistent data G06F11/1446; file migration policies for HSM systems G06F16/185) · CPC title

• G06F2201/85

  Active fault masking without idle spares · CPC title