IP Library › Granted Patent US 12,688,312
Granted Patent B2
US 12,688,312 · App. 18/959,418 · Granted Jul 21, 2026

Consistent access control lists across file servers for local users in a distributed file server environment

Inventors: Hemantha Kumar Thummala (San Jose, CA); Manoj Premanand Naik (San Jose, CA); Saji Kumar Vijaya Kumari Rajendran Nair (San Jose, CA); Srikrishan Malik (Pune, IN)
Assignee: Nutanix, Inc.
G06F21/604G06F16/188G06F21/602G06F21/6218G06F2221/2141
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Quick Facts
Patent No.
US 12,688,312
App. No.
18/959,418
Filed
Nov 25, 2024
Granted
Jul 21, 2026
Kind
B2
Art Unit
2434
USPC
726/26
Abstract

Examples described herein are generally directed towards file server access controls, and more specifically towards a mechanism to create consistent access control lists for local users across different file servers in a distributed file server environment. In operation, a local user system SID (e.g., external SID) may be generated for a first user of a first file server. A global ID based on attributes associated with the user of the first file server may also be generated. The global ID for the user may be stored in metadata associated with an access control list (ACL) for a file accessible through the first file server. Data, including the file may be migrated to a second file server. Based on receiving an access request at the second file server associated with the user based on the external ID, the external ID for the user may be translated into the global ID, and used to determine access to the file.

Claims (56)

1 . A method comprising:

registering a user at a first file server of a plurality of file servers, wherein the registering comprises generating a first local user system identification (SID) and a global ID for the user;

migrating data, including a file and an associated access control list (ACL), from the first file server to a second file server of the plurality of file servers;

registering the user at the second file server, wherein the registering comprises generating a second local user SID and the global ID for the user; and

providing access to the file at the second file server to the user, based at least on the global ID.

2 . The method of claim 1 , wherein generating the first local user SID is based at least on the first file server.

3 . The method of claim 1 , wherein generating the second local user SID is based at least on the second file server.

4 . The method of claim 1 , wherein the global ID generated for the user at the first file server is the same global ID generated for the user at the second file server.

5 . The method of claim 1 , wherein generating the global ID at the first file server, the second file server, or a combination thereof, is based at least on a hash function using one or more attributes associated with the user.

6 . The method of claim 1 , wherein the first file server comprises a first cluster of computing nodes configured to provide a distributed file system and the second file server comprises a second cluster of computing nodes, different from the first cluster of computing nodes, the second cluster of computing nodes also configured to provide the distributed file system.

7 . The method of claim 1 , wherein the first file server comprises a first cluster of computing nodes, and wherein each node of the first cluster of computing nodes comprises one or more file server virtual machines (FSVMs).

8 . The method of claim 7 , wherein the one or more FSVMs are configured to form a single namespace of storage items distributed across a storage pool, and wherein the storage pool includes local storage devices of the first cluster of computing nodes.

9 . The method of claim 1 , the method further comprising:

storing the global ID generated at the first file server in metadata associated with the ACL for the file, wherein the file and the ACL are accessible through the first file server.

10 . The method of claim 9 the method further comprising:

receiving an access request by the user to access the file at the second file server; and

translating the second local user SID for the user into the global ID.

11 . The method of claim 10 , the method further comprising:

matching the global ID to the ACL to determine access to the file for the user at the second file server.

12 . A system comprising:

a first file server comprising a first cluster of computing nodes and configured to provide a distributed file system, and a second file server comprising a second cluster of computing nodes different from the first cluster of computing nodes and configured to provide the distributed file system, wherein the first file server is further configured to:

generate, for a user of the first file server, a first local user system identification (SID),

generate, for the user, a global ID based on one or more attributes associated with the user, and

store the global ID fort the user in metadata associated with an access control list (ACL) for a file accessible through the first file server; and

wherein the second file server is further configured to:

receive data migrated from the first file server, the data comprising the file and the ACL,

generate, for the user, a second local user SID,

generate, for the user, the global ID based on the one or more attributes associated with the user, and

based on receiving an access request associated with the user based on the second local user SID, translating the second local user SID for the user into the global ID, wherein access to the file is determined based at least on the global ID.

13 . The system of claim 12 , wherein the global ID generated for the user at the first file server is the same global ID generated for the user at the second file server.

14 . The system of claim 12 , wherein access to the file is further determined based at least on matching the global ID translated from the second local user ID to the ACL.

15 . The system of claim 12 , wherein generating the global ID is further based on a hash function using the one or more attributes associated with the user.

16 . The system of claim 12 , wherein generating the first local user SID is based at least on the first file server.

17 . The system of claim 12 , wherein generating the second local user SID is based at least on the second file server.

18 . The system of claim 12 , wherein the first file server is a source file server and the second file server is a destination file server.

19 . The system of claim 12 , wherein each node of the first cluster of computing nodes comprises one or more file server virtual machines (FSVMs).

20 . The system of claim 19 , wherein the one or more FSVMs are configured to form a single namespace of storage items distributed across a storage pool, and wherein the storage pool includes local storage devices of the first cluster of computing nodes.

21 . At least one non-transitory computer readable media encoded with instructions which, when executed, cause a system to perform actions comprising:

registering a user at a first file server of a plurality of file servers, wherein the registering comprises generating a first local user system identification (SID) and a global ID for the user;

migrating data, including a file and an associated access control list (ACL), from the first file server to a second file server of the plurality of file servers;

registering the user at the second file server, wherein the registering comprises generating a second local user SID and the global ID for the user; and

providing access to the file at the second file server to the user, based at least on the global ID.

22 . The at least one non-transitory computer readable media of claim 21 , wherein generating the first local user SID is based at least on the first file server.

23 . The at least one non-transitory computer readable media of claim 21 , wherein generating the second local user SID is based at least on the second file server.

24 . The at least one non-transitory computer readable media of claim 21 , wherein the global ID generated for the user at the first file server is the same global ID generated for the user at the second file server.

25 . The at least one non-transitory computer readable media of claim 21 , wherein generating the global ID at the first file server, the second file server, or a combination thereof, is based at least on a hash function using one or more attributes associated with the user.

26 . The at least one non-transitory computer readable media of claim 21 , wherein the first file server comprises a first cluster of computing nodes configured to provide a distributed file system and the second file server comprises a second cluster of computing nodes, different from the first cluster of computing nodes, the second cluster of computing nodes also configured to provide the distributed file system.

27 . The at least one non-transitory computer readable media of claim 21 , wherein the first file server comprises a first cluster of computing nodes, and wherein each node of the first cluster of computing nodes comprises one or more file server virtual machines (FSVMs).

28 . The at least one non-transitory computer readable media of claim 27 , wherein the one or more FSVMs are configured to form a single namespace of storage items distributed across a storage pool, and wherein the storage pool includes local storage devices of the first cluster of computing nodes.

29 . The at least one non-transitory computer readable media of claim 21 , wherein the instructions, when executed, cause the system to perform actions further comprising:

storing the global ID generated at the first file server in metadata associated with the ACL for the file, wherein the file and the ACL are accessible through the first file server.

30 . The at least one non-transitory computer readable media of claim 29 , wherein the instructions, when executed, cause the system to perform actions further comprising:

receiving an access request by the user to access the file at the second file server; and

translating the second local user SID for the user into the global ID.

31 . The at least one non-transitory computer readable media of claim 30 , wherein the instructions, when executed, cause the system to perform actions further comprising:

matching the global ID to the ACL to determine access to the file for the user at the second file server.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 11, 2025
From: THUMMALA, HEMANTHA KUMAR; NAIK, MANOJ PREMANAND; NAIR, SAJI KUMAR VIJAYA KUMARI RAJENDRAN; MALIK, SRIKRISHAN
To: NUTANIX, INC.
Reel/Frame 070470/0400 →
SECURITY INTEREST Recorded Feb 13, 2025
From: NUTANIX, INC.
To: BANK OF AMERICA, N.A., AS COLLATERAL AGENT
Reel/Frame 070206/0463 →
Continuity (2)
Division 17648735 · Jan 24, 2022
Related Publication 20250086295A1 · Mar 13, 2025
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