https://www.juniper.net/documentation/us/en/software/junos/qfabric-troubleshooting/cli/topics/task/system-storage-cleanup-qfx-series.html

Clean up the file storage on the device by deleting system files.

1. Request to delete system files.

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   user@host> request system storage cleanup

   The list of files to be deleted is displayed.

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   List of files to delete:
   
            Size Date         Name
       11B Jul 26 20:55 /var/jail/tmp/alarmd.ts
      124B Aug  4 18:05 /var/log/default-log-messages.0.gz
     1301B Jul 26 20:42 /var/log/install.0.gz
      387B Jun  3 14:37 /var/log/install.1.gz
     4920B Aug  4 18:05 /var/log/messages.0.gz
     20.0K Jul 26 21:00 /var/log/messages.1.gz
     16.3K Jun 25 13:45 /var/log/messages.2.gz
      804B Aug  4 18:05 /var/log/security.0.gz
     16.8K Aug  3 11:15 /var/log/security.1.gz
      487B Aug  4 18:04 /var/log/wtmp.0.gz
      855B Jul 29 22:54 /var/log/wtmp.1.gz
      920B Jun 30 16:32 /var/log/wtmp.2.gz
       94B Jun  3 14:36 /var/log/wtmp.3.gz
    353.2K Jun  3 14:37 /var/sw/pkg/jloader-qfx-11.2I20110303_1117_dc-builder.tgz
    124.0K Jun  3 14:30 /var/tmp/gres-tp/env.dat
        0B Apr 14 16:20 /var/tmp/gres-tp/lock
        0B Apr 14 17:37 /var/tmp/if-rtsdb/env.lck
     12.0K Jul 26 20:55 /var/tmp/if-rtsdb/env.mem
   2688.0K Jul 26 20:55 /var/tmp/if-rtsdb/shm_usr1.mem
    132.0K Jul 26 20:55 /var/tmp/if-rtsdb/shm_usr2.mem
   2048.0K Jul 26 20:55 /var/tmp/if-rtsdb/trace.mem
      155B Jul 26 20:55 /var/tmp/krt_gencfg_filter.txt
        0B Jul 26 20:55 /var/tmp/rtsdb/if-rtsdb
   1400.6K Aug  3 10:13 /var/tmp/sfid.core.0.gz
   1398.9K Aug  3 17:01 /var/tmp/sfid.core.1.gz
   Delete these files ? [yes,no] (no) 

   Show more

• Enter yes to delete the files.

• Reboot the device.