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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. However, the Nessus Agent process is a low-priority process and yields the CPU whenever asked.

For more information on Nessus Agent resource usage, refer to Software Footprint and Host System Utilization.

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

Enterprise networks can vary in performance, capacity, protocols, and overall activity. Resource requirements to consider for Nessus Manager deployments include raw network speed, the size of the network being monitored, and the configuration of Nessus.


Minimum Recommended Hardware

Nessus Manager with up to 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 up to 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.

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