TOC & Recently Viewed

Recently Viewed Topics

Hardware Requirements

Nessus Agents

Nessus Agents are designed to be lightweight and to use only minimal system resources. Generally, a Nessus Agent uses 40 MB of RAM (all pageable). A Nessus Agent uses almost no CPU while idle, but is designed to use up to 100% of CPU when available during jobs.

For more information on Nessus Agent resource usage, see Nessus Agents Performance.

The following table outlines the minimum recommended hardware for operating a Nessus Agent. Nessus Agents can be installed on a virtual machine that meets the same requirements specified.


Minimum Requirement


1 Dual-core CPU

Processor Speed

< 1 Ghz

RAM < 1 GB
Disk Space < 1 GB
Disk Speed 15-50 IOPS

Nessus Manager

See the following table to understand the hardware requirements for Nessus Manager scanning.


Minimum Recommended Hardware

Nessus Manager with 0-10,000 agents

CPU: 4 2GHz cores

Memory: 16 GB RAM

Disk space: 30 GB (Additional space may be needed for reporting)

Nessus Manager with 10,001-20,000 agents

CPU: 8 2GHz cores

Memory: 64 GB RAM

Disk space: 30 GB (Additional space may be needed for reporting)

Note: Engage with your Tenable representative for large deployments.

Nessus Manager can also be installed on a Virtual Machine that meets the same requirements. If your virtual machine is using Network Address Translation (NAT) to reach the network, many of the Nessus vulnerability checks, host enumeration, and operating system identification are negatively affected.

Copyright © 2019 Tenable, Inc. All rights reserved. Tenable,, Tenable Network Security, Nessus, SecurityCenter, SecurityCenter Continuous View and Log Correlation Engine are registered trademarks of Tenable, Inc.., Lumin, Assure, and the Cyber Exposure Company are trademarks of Tenable, Inc. All other products or services are trademarks of their respective owners.