Method and system for creation, analysis and navigation of virtual snapshots

• US 8,364,639 B1
• Filed: 10/10/2008
• Issued: 01/29/2013
• Est. Priority Date: 10/11/2007
• Status: Active Grant

• Current Assignee: Parallels International GmbH (Corel Holdings LP)
• Original Assignee: Parallels Holdings Limited (HNA Technology Co. Ltd.)
• Inventors: Koryakina, Elena A., Koryakin, Alexey B.
• Primary Examiner(s): Beausoliel, Jr., Robert
• Assistant Examiner(s): Pham, Michael
• Application Number:
  US12/248,929
• Time in Patent Office: 1,572 Days
• Field of Search: 707/639, 707/758, 715/733, 718/1
• US Class Current: 707/639
• CPC Class Codes: G06F 11/1458 Management of the backup or restore process
• CPC Class Codes: G06F 11/1484 involving virtual machines
• CPC Class Codes: G06F 16/128 Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion use of snapshots for error detection or correction G06F11/14, G06F11/16
• CPC Class Codes: G06F 2009/45562 Creating, deleting, cloning virtual machine instances
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• CPC Class Codes: G06F 9/45533 Hypervisors; Virtual machine monitors
• CPC Class Codes: G06F 9/45558 Hypervisor-specific management and integration aspects

Abstract

A method and system for generating and managing snapshots of Virtual Machine (i.e., virtual snapshots) and creating a centralized integrated backup for the Virtual Machine (VM). Proposed method and system allow users to roll back to any previous version of the VM and instantiate this version using the logic encapsulated in a virtual snapshot of the VM. The virtual snapshots taken at various times are combined into a chronological tree viewable via a virtual snapshot image viewer. The snapshot trees for different VMs are combined into centralized integrated system backup (CIB) that can be managed by a central console including a GUI of the virtual snapshot image viewer.

Claims

1. A method for generation of virtual snapshots comprising:

(a) activating a Virtual Machine (VM) on a computer system;

(b) acquiring VM context;

(c) generating a virtual snapshot based on the VM context, the virtual snapshot including a state of the VM'"'"'s disk at a particular moment in time for a history of the virtual snapshots, and a state of the VM'"'"'s virtual CPU, including a state of its registers and flags at the particular moment in time;

(d) adding the virtual snapshot to a virtual snapshot tree, wherein the virtual snapshot tree is viewable via a virtual snapshot image viewer that provides a Graphical User Interface for viewing the virtual snapshot tree and the history of the virtual snapshots representing the states of the VM'"'"'s disk at prior moments in time and the states of the VM'"'"'s virtual CPU, including the states of its registers and flags at the prior moments in time;

(e) repeating steps (a)-(d) at least one more time; and

(f) indicating properties of virtual snapshots from the virtual snapshot tree and differences between the properties of the virtual snapshots from the virtual snapshot tree.

2. The method of claim 1, wherein step (f) is implemented for at least two virtual snapshots selected by a user.

3. The method of claim 2, further comprising selecting one virtual snapshot as a base virtual snapshot and a group of virtual snapshots, wherein for each virtual snapshot from the group differences between said virtual snapshot and the base virtual snapshot is indicated.

4. The method of claim 1, further comprising modifying virtual snapshot parameters can be modified inside the virtual snapshot, including any of disabling drivers, replacing files (such as Dynamic-link library (DLL) or drivers for different OSs and device versions), updating registry inside virtual snapshots with windows, making group operations on a full tree or on a sub-tree, disabling in all virtual snapshots derived from a particular tree node for a particular driver, modifying the virtual snapshot the tree at a particular node such that all child nodes have the modified parameters, and generating a new virtual snapshot with the updated state as a leaf.

5. The method of claim 1, wherein the properties comprise at least one of:

a virtual Hard Disk Drive (HDD) or Hard Disk Drive (HDD) partition usage or capacity;

a usage of the virtual CPU;

virtual or physical memory state;

system constants;

list of running processes;

VM processes conditions and priorities;

performance parameters;

list of OS device drivers installed, enabled-disabled, or running;

file system data related to file system installed on the HDD or HDD partition; and

a part of file system, including any of (a) transaction log, (master file table (mft), or directories, (b) file system transaction log, (c) Windows NT File System (NTFS) master file table, (d) Unix superblock and (e) directories in NTFS, Third Extended file system (ext3), Hierarchical file system (HFS), Z file system (ZFS), Global file system (GFS), or Oracle cluster file system (OCFS).

6. The method of claim 1, wherein the VM is a virtualization space.

7. The method of claim 5, wherein the VM is any of:

SWsoft Virtuozzo;

virtual environment isolated by software means;

virtual environment isolated using hardware means; and

any combination thereof.

8. The method of claim 1, wherein and the VM context includes any of:

state of VM configuration file;

state of VM memory;

state of VM Hard Disk Drive (HDD);

state of VM Compact Disk Read Only Memory (CD ROM);

state of VM network configuration;

a state of at least some of VM parameters associated with the Hard Disk Drive (HDD); and

state of VM sound configuration.

9. The method of claim 1, further comprising providing user with graphical panel for selection or setting of virtual snapshots properties and indicating virtual snapshots corresponded to user'"'"'s selections or settings in the virtual snapshot image viewer.

10. The method of claim 1, further comprising providing user with graphical panel for selection of a virtual snapshot and selection of the virtual snapshot properties further comprising restoring the properties in a context of another VM.

11. The method of claim 10, further comprising selecting another virtual snapshot as a source of another VM context.

12. The method of claim 10, further comprising restoring selected virtual snapshot properties in a VM context running on the computing system.

13. The method of claim 1, wherein the virtual snapshot is generated per user request.

14. The method of claim 1, wherein the virtual snapshot is generated automatically according to a pre-defined schedule.

15. The method of claim 1, wherein the virtual snapshot tree is analyzed by a virtual snapshot image viewer and rendered to a user.

16. The method of claim 1, wherein the virtual snapshot includes logic for instantiating the VM executed at a time of the virtual snapshot generation.

17. The method of claim 15, wherein the logic for instantiating the VM is invoked by the GUI of the virtual snapshot image viewer.

18. The method of claim 1, wherein the virtual snapshot image viewer includes an ability to edit virtual snapshot properties or VM properties in response to user commands.

19. A non-transitory computer useable medium having computer executable program logic stored thereon for executing on a processor for generation of virtual snapshots, computer executable program logic comprising:

(a) computer program code means for activating a Virtual Machine (VM) on a computer system;

(b) computer program code means for acquiring state parameters of the VM;

(c) computer program code means for generating a virtual snapshot based on the state parameters, the virtual snapshot including a state of the VM'"'"'s disk at a particular moment in time for a history of the virtual snapshots and a state of the VM'"'"'s virtual CPU, including a state of its registers and flags at the particular moment in time;

(d) computer program code means for adding the virtual snapshot to a virtual snapshot tree, wherein the virtual snapshot tree is viewable via a virtual snapshot image viewer that provides a Graphical User Interface for viewing the virtual snapshot tree and the history of the virtual snapshots representing the states of the VM'"'"'s disk at prior moments in time and the states of the VM'"'"'s virtual CPU including the states of its registers and flags at the prior moments in time; and

(e) computer program code means for implementing (a)-(d) at least one more time.

20. A method for creating a centralized integrated backup (CIB) of a computer system comprising:

activating a plurality of Virtual Machines (VMs) on a computer system;

acquiring context for each VM;

generating a virtual snapshot of each VM based on the context, the virtual snapshot including a state of the VM'"'"'s disk at a particular moment in time for a history of the virtual snapshots and a state of the VM'"'"'s virtual CPU, including a state of its registers and flags at the particular moment in time;

creating a virtual snapshot tree for each VM;

adding the virtual snapshot of each VM to the corresponding virtual snapshot tree; and

combining virtual snapshot trees of all the VMs into the CIB of the computer system, wherein the virtual snapshots and the CIB are viewable via a virtual snapshot image viewer that provides a Graphical User Interface for viewing the CIB and the history of the virtual snapshots representing the states of the VM'"'"'s disk at prior moments in time and the states of the VM'"'"'s virtual CPU, including the states of its registers and flags at the prior moments in time.

21. The method of claim 20, wherein the CIB is managed by an administrator through a central management console including a GUI of the virtual snapshot image viewer.