IP Library › Granted Patent US 12,547,350
Granted Patent B2
US 12,547,350 · App. 18/812,256 · Granted Feb 10, 2026

Global de-duplication of virtual disks in a storage platform

Inventors: Avinash Lakshman (Fremont, CA); Gaurav Yadav (Mount View, CA)
Assignee: Commvault Systems, Inc.
G06F3/0664G06F3/0608G06F3/0641G06F3/0683
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Quick Facts
Patent No.
US 12,547,350
App. No.
18/812,256
Granted
Feb 10, 2026
Kind
B2
Abstract

In order to avoid writing duplicates of blocks of data into a storage platform, any virtual disk within the storage platform may have a de-duplication feature enabled. Or, all virtual disks have this feature enabled. For virtual disks with de-duplication enabled, a unique message digest is calculated for every block of data written to that virtual disk. Upon a write, these message digests are consulted in order to determine if a particular block of data has already been written, if so, it is not written again, and if not, it is written. All de-duplication virtual disks are written to a single system virtual disk within the storage platform. De-duplication occurs over the entire storage platform and over all its virtual disks because all message digests are consulted before a write is performed for any virtual disk. A read for a de-duplication virtual desk reads from the system virtual disk.

Claims (54)

1 . A system comprising:

a plurality of computer nodes, wherein each computer node among the plurality of computer nodes comprises a hardware processor and data storage devices; and

a system deduplication disk, which is configured as a virtual disk of the system,

wherein the system deduplication disk comprises storage locations distributed among data storage devices in one or more computer nodes among the plurality of computer nodes,

wherein the system deduplication disk is configured to store deduplicated data for a plurality of virtual disks of the system that are configured as addressable targets for software applications that write data to the system, and

wherein the system deduplication disk is not presented by the system as an addressable target for software applications that write data to the system; and

one or more data structures, which are stored at one or more computer nodes among the plurality of computer nodes,

wherein the one or more data structures comprise unique hash values corresponding to data blocks that are stored in the system deduplication disk; and

wherein a computer server, which comprises a hardware processor and is in communication with at least one computer node among the plurality of computer nodes, is configured to:

intercept a first write request issued by a software application, wherein the first write request comprises a first data block and is addressed to a first virtual disk of the system, wherein the first virtual disk is configured with deduplication enabled, and wherein the first virtual disk is distinct from the system deduplication disk, and

based on determining that a first hash value for the first data block is not present in the one or more data structures: cause a first computer node among the plurality of computer nodes to store the first data block at a first storage location of the system deduplication disk, wherein the first storage location is configured at the first computer node, and wherein the first data block is not stored into the first virtual disk addressed by the first write request, and

cause to be added to the one or more data structures: the first hash value and an indication of the first storage location.

2 . The system of claim 1 , wherein the indication of the first storage location comprises an offset within the system deduplication disk.

3 . The system of claim 1 , wherein the plurality of virtual disks of the system that are configured as addressable targets are configured with deduplication enabled.

4 . The system of claim 1 , wherein the computer server is configured to host a controller virtual machine, which is configured to intercept write requests issued by the software application, including the first write request.

5 . The system of claim 4 , wherein the computer server hosting the controller virtual machine is further configured to, based on determining that the first hash value is present in a first data structure among the one or more data structures: retrieve from the first data structure an indication of a second storage location where a second data block having the first hash value of the first data block is stored in the system deduplication disk, and update metadata associated with the first virtual disk to associate the first data block with the second data block.

6 . The system of claim 4 , wherein the computer server hosting the controller virtual machine is further configured to: store the first data block at the controller virtual machine, wherein the first data block is to be read therefrom in response to a subsequent read request for the first data block intercepted by the controller virtual machine.

7 . The system of claim 1 , wherein a second computer node among the plurality of computer nodes is configured to: store metadata associated with the first data block, wherein the metadata comprises an identifier of the first data block, and wherein the metadata indicates a number of computer nodes among the plurality of computer nodes where the first data block was physically stored at one or more storage locations of the system deduplication disk, including an indication of the first computer node.

8 . The system of claim 7 , wherein the number corresponds to a replication factor configured for the system deduplication disk.

9 . The system of claim 7 , wherein the second computer node that stores the metadata is the same as the first computer node that stores the first data block.

10 . The system of claim 7 , wherein the second computer node that stores the metadata is different from the first computer node that stores the first data block.

11 . The system of claim 1 , wherein the first computer node is configured to:

store the first data block at the first storage location of the system deduplication disk configured at the first computer node; and

transmit the first data block to a number of other computer nodes among the plurality of computer nodes, wherein the number is based on a replication factor configured for the system deduplication disk.

12 . The system of claim 1 , wherein the computer server is further configured to:

intercept a read request issued by the software application, wherein the read request is for a third data block from the first virtual disk,

based on metadata that indicates that the third data block is stored at a given storage location of the system deduplication disk, determine that the given storage location corresponds to the first computer node,

request the third data block from the first computer node, and

responsive to the read request, return the third data block to the software application, as obtained from the system deduplication disk.

13 . A system comprising:

a plurality of computer nodes, wherein each computer node among the plurality of computer nodes comprises a hardware processor and data storage devices; and

a computer server, which comprises a hardware processor and is in communication with at least one computer node among the plurality of computer nodes, wherein the computer server is configured to host a controller virtual machine, which is configured to intercept write requests issued by a software application hosted by the computer server;

a system deduplication disk, which is configured as a virtual disk of the system,

wherein the system deduplication disk is not presented by the system as an addressable target for the software application,

wherein the system deduplication disk comprises storage locations distributed among data storage devices in one or more computer nodes among the plurality of computer nodes, and

wherein the system is configured to store deduplicated data, at the system deduplication disk, for one or more virtual disks of the system that are configured with deduplication enabled; and

one or more deduplication tables, which are stored at one or more of: the computer server and one or more computer nodes among the plurality of computer nodes,

wherein the one or more deduplication tables comprise unique hash values corresponding to data blocks stored in the system deduplication disk; and

wherein the computer server is configured to:

intercept a first write request issued by the software application, wherein the first write request comprises a first data block and is addressed to a first virtual disk of the system, wherein the first virtual disk is configured with deduplication enabled, and wherein the first virtual disk is distinct from the system deduplication disk,

based on determining that a first hash value for the first data block is not present in the one or more deduplication tables: cause a first computer node among the plurality of computer nodes to store the first data block at a first storage location of the system deduplication disk, wherein the first storage location is configured at the first computer node, and wherein the first data block is not stored into the first virtual disk addressed by the first write request, and further cause to be added to the one or more deduplication tables: the first hash value and an indication of the first storage location.

14 . The system of claim 13 , wherein the indication of the first storage location comprises an offset within the system deduplication disk.

15 . The system of claim 13 , wherein the computer server hosting the controller virtual machine is further configured to, based on determining that the first hash value is present in a first deduplication table among the one or more deduplication tables: retrieve from the first deduplication table an indication of a second storage location where a second data block having the first hash value of the first data block is stored in the system deduplication disk, and update metadata associated with the first virtual disk to associate the first data block with the second data block.

16 . The system of claim 13 , wherein the computer server hosting the controller virtual machine is further configured to: store the first data block at the controller virtual machine, wherein the first data block is to be read therefrom in response to a subsequent read request for the first data block intercepted by the controller virtual machine.

17 . The system of claim 13 , wherein a second computer node among the plurality of computer nodes is configured to: store metadata associated with the first data block, wherein the metadata comprises an identifier of the first data block, and wherein the metadata indicates a number computer nodes among the plurality of computer nodes where the first data block was physically stored at one or more storage locations of the system deduplication disk, including an indication of the first computer node, wherein the number corresponds to a replication factor configured for the system deduplication disk.

18 . The system of claim 17 , wherein the second computer node that stores the metadata is one of: the same as the first computer node that stores the first data block, and different from the first computer node that stores the first data block.

19 . The system of claim 13 , wherein the first computer node is configured to:

store the first data block at the first storage location of the system deduplication disk configured at the first computer node; and

transmit the first data block to a number of other computer nodes among the plurality of computer nodes, wherein the number is based on a replication factor configured for the system deduplication disk.

20 . The system of claim 13 , wherein the computer server hosting the controller virtual machine is further configured to:

intercept a read request issued by the software application, wherein the read request is for a third data block from the first virtual disk,

based on metadata that indicates that the third data block is stored at a given storage location of the system deduplication disk, determine that the given storage location corresponds to the first computer node,

request the third data block from the first computer node, and

responsive to the read request, return the third data block to the software application, as obtained from the system deduplication disk.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 22, 2025
From: LAKSHMAN, AVINASH; YADAV, GAURAV
To: HEDVIG, INC.
Reel/Frame 072322/0455 →
SUPPLEMENTAL CONFIRMATORY GRANT OF SECURITY INTEREST IN UNITED STATES PATENTS Recorded Apr 16, 2025
From: COMMVAULT SYSTEMS, INC.
To: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 070864/0344 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 29, 2024
From: HEDVIG, INC.
To: COMMVAULT SYSTEMS, INC.
Reel/Frame 068434/0168 →
Continuity (5)
Continuation 18205448 · Jun 2, 2023
Continuation 17707077 · Mar 29, 2022
Continuation 17028164 · Sep 22, 2020
Continuation 15155838 · May 16, 2016
Related Publication 20240411487A1 · Dec 12, 2024
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