Failure recovery in shared storage operations

• US 10,185,630 B2
• Filed: 03/30/2018
• Issued: 01/22/2019
• Est. Priority Date: 02/22/2016
• Status: Active Grant

• Current Assignee: Red Hat, Inc. (International Business Machines Corporation)
• Original Assignee: Red Hat Israel Ltd. (International Business Machines Corporation)
• Inventors: Litke, Adam, Soffer, Nir, Aravot, Liron
• Primary Examiner(s): Butler, Sarai E
• Application Number:
  US15/941,457
• Publication Number:
  US 20180225178A1
• Time in Patent Office: 298 Days
• Field of Search: 714 19
• CPC Class Codes: G06F 11/0793 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 Class Codes: G06F 11/1451 by selection of backup contents
• CPC Class Codes: G06F 2009/45583 Memory management, e.g. access or allocation
• CPC Class Codes: G06F 2201/805 Real-time
• CPC Class Codes: G06F 2201/815 Virtual
• CPC Class Codes: G06F 2201/82 Solving problems relating to consistency
• CPC Class Codes: G06F 2201/825 the problem or solution involving locking
• CPC Class Codes: G06F 3/0604 Improving or facilitating administration, e.g. storage management
• CPC Class Codes: G06F 3/0622 in relation to access
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/0667 at data level, e.g. file, record or object virtualisation
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: G06F 9/45545 Guest-host, i.e. hypervisor is an application program itself, e.g. VirtualBox
• CPC Class Codes: G06F 9/45558 Hypervisor-specific management and integration aspects

Abstract

Systems and methods for failure recovery in shared storage operations. An example method comprises: acquiring, by a processing device, a lock with respect to a storage domain comprising a specified disk image; creating a transaction marker associated with the disk image, wherein the transaction marker is represented by a pre-defined tag associated with a logical volume of a block-based storage, wherein the logical volume implements a data area of a new volume associated with the disk image; creating a component of the new volume associated with the disk image; destroying the transaction marker by removing the pre-defined tag representing the transaction marker from the logical volume; and releasing the lock with respect to the storage domain.

Claims

1. A method, comprising:

acquiring, by a processing device, a lock with respect to a storage domain comprising a specified disk image;

creating a transaction marker associated with the disk image, wherein the transaction marker is represented by a pre-defined tag associated with a logical volume of a block-based storage, wherein the logical volume implements a data area of a new volume associated with the disk image;

creating a component of the new volume associated with the disk image;

destroying the transaction marker by removing the pre-defined tag representing the transaction marker from the logical volume; and

releasing the lock with respect to the storage domain.

2. The method of claim 1, wherein the component of the new volume is provided by a metadata area employed to store a reference to a parent volume in a copy-on-write chain.

3. The method of claim 1, wherein the component of the new volume is provided by a lease area employed for storing information utilized for managing access to the new volume.

4. The method of claim 1, wherein the storage domain references a group of logical unit numbers (LUNs) of the block-based storage.

5. The method of claim 1, wherein creating the component of the new volume further comprises:

allocating a segment of a logical volume storing metadata information for a plurality of volumes of the storage domain, wherein segment is identified by an index in an array of pointers identifying logical volume segments.

6. The method of claim 1, wherein creating the component of the new volume further comprises:

allocating a segment of a logical volume storing lease information for a plurality of volumes of the storage domain, wherein segment is identified by an index in an array of pointers identifying logical volume segments.

7. The method of claim 1, further comprising:

performing failure recovery to roll back a failed or incomplete transaction associated with the disk image.

8. A method, comprising:

scanning, by a processing device, a specified storage domain to compile a list of transaction markers;

acquiring a lock with respect to the specified storage domain;

retrieving a transaction marker from the list, wherein the transaction marker is provided by a pre-defined tag associated with a logical volume residing on a block-based storage device, wherein the logical volume represents a volume data area;

destroying a storage object referenced by the transaction marker;

destroying the transaction marker; and

releasing the lock with respect to the specified storage domain.

9. The method of claim 8, wherein the storage object is provided by a segment of a logical volume storing metadata information for a plurality of volumes of the storage domain, wherein segment is identified by an index in an array of pointers identifying logical volume segments.

10. The method of claim 8, wherein the storage object is provided by a segment of a logical volume storing lease information for a plurality of volumes of the storage domain, wherein segment is identified by an index in an array of pointers identifying logical volume segments.

11. The method of claim 8, wherein destroying the transaction marker further comprises:

removing the pre-defined tag representing the transaction marker from the logical volume.

12. The method of claim 8, wherein scanning the specified data area is performed responsive to determining that a free disk space has fallen below a specified threshold.

13. The method of claim 8, wherein the storage domain references a group of logical unit numbers (LUNs) of the block-based storage.

14. The method of claim 8, wherein the transaction marker represents a failed transaction.

15. A computer-readable non-transitory storage medium comprising executable instructions that, when executed by a processing device, cause the processing device to:

scan a specified storage domain to compile a list of transaction markers;

acquire a lock with respect to the specified storage domain;

retrieve a transaction marker from the list, wherein the transaction marker is provided by a pre-defined tag associated with a logical volume residing on a block-based storage device, wherein the logical volume represents a volume data area;

destroy a storage object referenced by the transaction marker;

destroy the transaction marker; and

release the lock with respect to the specified storage domain.

16. The computer-readable non-transitory storage medium of claim 15, wherein the storage object is provided by a segment of a logical volume storing metadata information for a plurality of volumes of the storage domain, wherein segment is identified by an index in an array of pointers identifying logical volume segments.

17. The computer-readable non-transitory storage medium of claim 15, wherein the storage object is provided by a segment of a logical volume storing lease information for a plurality of volumes of the storage domain, wherein segment is identified by an index in an array of pointers identifying logical volume segments.

18. The computer-readable non-transitory storage medium of claim 15, wherein destroying the transaction marker further comprises:

removing the pre-defined tag representing the transaction marker from the logical volume.

19. The computer-readable non-transitory storage medium of claim 15, wherein scanning the specified data area is performed responsive to determining that a free disk space has fallen below a specified threshold.

20. The computer-readable non-transitory storage medium of claim 15, wherein the transaction marker represents a failed transaction.