What is the use of the 'clean-install' option
Use the command below with clean-install
request vmhost software add /var/public/jinstall-host-nfx-3-x86-64-21.2R3-S2.9-secure-signed.tgz no-validate clean-install
The clean-install command removes all contents on the hard disk. To avoid data loss, copy all important files, configuration files (JDM, JCP, vSRX Virtual Firewall, and third-party VNFs), log files, and VNF disk or image files, and save them in a secure location before you upgrade the device.