This article documents an issue on EX4600 running EOS code in which the show system storage command reports a negative value for the root (/) directory before performing a software upgrade.

root@EX46> show version

Hostname: EX46

Model: ex4600-40f

Junos: 20.4R2-S1.6

show system storage
fpc0:
--------------------------------------------------------------------------
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/ad0s1a             1.4G       1.4G     -28.3M      102%  /
devfs                   1.0K       1.0K         0B      100%  /dev

The suggestion is to check if the negative value is cosmetic or not, you can follow the steps below:

-Check if the value is affected removing files

-Test a commit check, without space, normally the commit fails

-Push an upgrade package, without space, staging the code, upgrade will fail.

From shell mode, you can look for files bigger than 10mb, you can safely remove files in var/tmp or log files.

sh -c 'find / -size +10485760c 2> /dev/null' | xargs du -h | sort -nr

If after deleting a file, the value is not affected. You can check if the commit works fine.

#set vlans v999 vlan-id 999

#commit check

If the commit succeeds it's probably a cosmetic issue. You can confirm pushing the upgrade:

>request system software add /var/tmp/code-version.tgz force-host no-validate

After reboot, the value is corrected:

Hostname: EX46

Model: ex4600-40f

Junos: 21.4R3-S12.2

fpc0:
--------------------------------------------------------------------------
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/ad0s1a             1.6G       1.4G       139M       91%  /
devfs                   1.0K       1.0K         0B      100%  /dev