Method and device for recovering data replication between storage devices

Patent metadata

Field	Value
Publication number	US-10007567-B2
Application number	US-201615389775-A
Country	US
Kind code	B2
Filing date	Dec 23, 2016
Priority date	Dec 31, 2015
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

There is provided a method and device for recovering data replication between storage devices. The method comprises: creating mirrored pairs between logical units of a primary storage device and logical units of a secondary storage device; in response to the primary storage device recovering from an interruption state to a normal state, re-creating the mirrored pairs based on one or more replication sessions between the logical units of the primary storage device and the logical units of the secondary storage device stored before interruption; and replicating data to the primary storage device based on the re-created mirrored pairs.

First claim

What is claimed is:

1. A method of recovering data replication between storage devices, comprising:
creating mirrored pairs between logical units of a primary storage device and logical units of a secondary storage device;
in response to the primary storage device recovering from an interruption state to a normal state, re-creating the mirrored pairs based on one or more replication sessions between the logical units of the primary storage device and the logical units of the secondary storage device stored before interruption; and
replicating data to the primary storage device based on the re-created mirrored pairs.

2. The method according to claim 1 , wherein creating mirrored pairs between logical units of a primary storage device and logical units of a secondary storage device comprises:
creating the mirrored pairs corresponding to the respective logical units of the primary storage device and the respective logical units of the secondary storage device, each mirrored pair including a primary mirror corresponding to one of the logical units of the primary storage device and a secondary mirror corresponding to a respective one of the logical units of the secondary storage device;
forming a consistency group based on the mirrored pairs; and
storing first information including the mirrored pairs and the consistency group to a database of the primary storage device, and replicating the first information to a database of the secondary storage device.

3. The method according to claim 2 , wherein re-creating the mirrored pairs based on one or more replication sessions between the logical units of the primary storage device and the logical units of the secondary storage device stored before interruption comprises:
for the one or more replication sessions before the interruption, acquiring, from the database of the secondary storage device, the first information on the mirrored pairs before the interruption, to re-create the mirrored pairs.

4. The method according to claim 3 , wherein for the one or more replication sessions before the interruption, acquiring, from the database of the secondary storage device, the first information on the mirrored pairs before the interruption, to re-create the mirrored pairs comprises:
setting the secondary mirror of the secondary storage device as a new primary mirror;
setting the primary mirror of the primary storage device as a new secondary mirror; and
creating, based on the first information acquired from the database of the secondary storage device, a new mirrored pair including the new primary mirror and the new secondary mirror.

5. The method according to claim 3 , further comprising:
removing an original mirrored pair of the primary storage device before setting the secondary mirror of the secondary storage device as the new primary mirror.

6. The method according to claim 1 , wherein replicating data to the primary storage device based on the re-created mirrored pair comprises:
forming a new consistency group based on the re-created mirrored pair;
in response to forming the new consistency group, storing second information including the re-created mirrored pair and the new consistency group to a database of the secondary storage device, and replicating the second information to a database of the primary storage device; and
transmitting the replicated data from the secondary storage device to the primary storage device.

7. A device for recovering data replication between storage devices, comprising:
a creating unit configured to create mirrored pairs between logical units of a primary storage device and logical units of a secondary storage device;
a re-creating unit configured to, in response to the primary storage device recovering from an interruption state to a normal state, re-create the mirrored pairs based on one or more replication sessions between the logical units of the primary storage device and the logical units of the secondary storage device stored before interruption; and
a data replicating unit configured to replicate data to the primary storage device'based on the re-created mirrored pairs.

8. The device according to claim 7 , wherein the creating unit comprises:
a mirrored pairs creating unit configured to create the mirrored pairs corresponding to the respective logical units of the primary storage device and the respective logical units of the secondary storage device, each mirrored pair including a primary mirror corresponding to one of the logical units of the primary storage device and a secondary mirror corresponding to a respective one of the logical units of the secondary storage device;
a first consistency group forming unit configured to form a consistency group based on the mirrored pairs; and
a first information replicating unit configured to store first information including the mirrored pairs and the consistency group to a database of the primary storage device, and replicate the first information to a database of the secondary storage device.

9. The device according to claim 8 , wherein the re-creating unit comprises:
a mirrored pairs re-creating unit configured to, for the one or more replication sessions before the interruption, acquiring, from the database of the secondary storage device, the first information on the mirrored pairs before the interruption, to re-create the mirrored pairs.

10. The device according to claim 9 , wherein the mirrored pairs re-creating unit comprises:
a first mirror setting subunit configured to set the primary mirror of the primary storage device as a new secondary mirror
a second mirror setting subunit configured to set the primary mirrors of the primary storage device as new secondary mirrors; and
a mirrored pair creating subunit configured to create, based on the first information acquired from the database of the secondary storage device, a new mirrored pair including the new primary mirror and the new secondary mirror.

11. The device according to claim 9 , further comprising:
a mirrored pair removing unit configured to remove an original mirrored pair of the primary storage device before setting the secondary mirror of the secondary storage device as the new primary mirror.

12. The device according to claim 7 , wherein the data replicating unit comprises:
a second consistency group forming unit configured to form a new consistency group based on the re-created mirrored pair;
a second information replicating unit configured to, in response to forming the new consistency group, store second information including the re-created mirrored pair and the new consistency group to a database of the secondary storage device, and replicate the second information to a database of the primary storage device; and
a data transmitting unit configured to transmit the replicated data from the secondary storage device to the primary storage device.

13. A computer program product for recovering data replication between storage devices, the computer program product comprising:
a non-transitory computer readable medium encoded with computer-executable code, the code configured to enable the execution of:
creating mirrored pairs between logical units of a primary storage device and logical units of a secondary storage device;
in response to the primary storage device recovering from an interruption state to a normal state, re-creating the mirrored pairs based on one or more replication sessions between the logical units of the primary storage device and the logical units of the secondary storage device stored before interruption; and
replicating data to the primary storage device based on the re-created mirrored pairs.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Zhang Alex Minghui
• Xiong Brian Tianfang
• Wu Yuanyang
• Lu Yifeng
• Xu Sherry Hongru

Classifications

• G06F11/2064 Primary

  while ensuring consistency · CPC title

• G06F11/07 Primary

  Responding to the occurrence of a fault, e.g. fault tolerance · CPC title

• G06F12/16

  Protection against loss of memory contents {(contains no material, see G06F11/00)} · CPC title

• G06F11/2071

  using a plurality of controllers · CPC title

• G06F11/2082

  Data synchronisation · CPC title