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Known Limits and Supported Configurations for Qumulo Core


This article provides an overview of the known limits and supported configurations for Qumulo clusters.


The following are the known limits and supported configurations for Qumulo clusters based on internal testing and certification processes.

Supported Protocols (and Versions)

  • FTP
  • NFSv3
  • NFSv4.1
  • SMB 2.002
  • SMB 2.1
  • SMB 3.0
  • SMB 3.1

For more information about NFSv4.1, see Enabling and Using NFSv4.1 on a Qumulo Cluster and Managing File Access Permissions Using NFSv4.1 Access Control Lists (ACLs).

Supported Browser

Google Chrome (version 80 or later)

Supported Clients over SMB

  • macOS 11, 10.15, 10.14
  • Windows 11, 10, 8.1, 8, 7

Supported Clients over NFS

  • macOS 11, 10.15, 10.14
  • Linux Kernel 5.x, 4.x, 3.x, 2.6.x

Linux Configuration

Qumulo Core is up-to-date with all Ubuntu 18.04 security updates

Domain-Functional Level

Microsoft Windows Server 2008 R2 and above

Note: Samba Domain Controllers are unsupported.

Supported Kerberos V5 Encryption Types

  • RC4-HMAC-MD5

Maximum On-Premises Cluster Size

100 nodes

Maximum Cloud Cluster Size

100 nodes

Maximum Floating IP Addresses per Node

10 IP addresses

Maximum NFS Exports

64,000 exports

Maximum SMB Shares


Maximum ACEs in ACL

200 ACEs

NFS Group Limit

16 without RFC2307+kerberos

Max Combined Users and Groups

4 billion

Character Limits

  • Cluster Name: 2-15 characters (alphanumeric or -)
  • Full Path (pathname): 32,760 characters (protocol limited)
  • File Path Component (file or directory): 255 characters

Maximum Files in a Directory

4.3 billion files

Maximum File Size

9 exabytes

Maximum Number of Files

18 quintillion files 

Max Number of Hard Links per File

1024 hard links 

Total LDAP Domains

1 domain

Supported LDAP Servers

OpenLDAP for group expansion

Total Active Directory Domains 

1 domain

Total DNS servers

Up to 3 DNS servers

Maximum Snapshots 

40,000 snapshots

Maximum Quotas 

Not Specified

Replication Limits 

  • Max Relationships: 100
  • Max Directory Depth: 100

QQ Command-Line Tool Requirements

  • Python 3.8 (or higher)


Qumulo Safety Instructions

Qumulo Getting Started Guide

QQ CLI: Comprehensive List of Commands


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