Managing Disk Space for Junos OS Installation
A Junos OS installation or upgrade may fail if your router has a shortage of disk space. If a disk space error occurs, use one or more of the following options to complete the installation:
Use the request system storage cleanup command to delete unnecessary files and increase storage space on the router.
Specify the unlink option when you use the request system software add command to install the Junos OS:
On the M Series, MX Series, and T Series routers, the unlink option removes the software package after a successful upgrade.
Download the software packages you need from the Juniper Networks Support Web site at
https://www.juniper.net/support/. The download program provides intelligent disk space management to enable installation.