Several command line utilities which are provided with FreeNAS® are demonstrated in this section.
The following utilities can be used for benchmarking and performance testing:
- Iperf: used for measuring maximum TCP and UDP bandwidth performance
- Netperf: a tool for measuring network performance
- IOzone: filesystem benchmark utility used to perform a broad filesystem analysis
- arcstat.py and arc_summary.py: used to gather ZFS ARC statistics
- XDD: a tool for measuring and characterizing disk subsystem I/O
The following utilities are hardware-specific and require the underlying hardware to be installed:
- tw_cli: used to monitor and maintain 3ware RAID controllers
- MegaCli: used to configure and manage LSI MegaRAID SAS family of RAID controllers
- IPMItool: used to manage and configure IPMI devices
This section also describes the following utilities:
- freenas-debug: the backend used to dump FreeNAS® debugging information
- tmux: a terminal multiplexer similar to GNU screen
- Dmidecode: reports information about system hardware as described in the system’s BIOS
- OpenVPN: highly configurable VPN daemon which can be used to securely link two or more private networks using an encrypted tunnel