I have a SMS running R80.10 and started receiving messages in SmartConsol that "Partition /opt has: 1716 MB of free space and it's lower than required: 2000 MB".

I ran the commands below and they seem to show the directories that are large.

Is it safe to delete any files in these directories to free up space?

[Expert@msgcu-sms:0]# pwd
[Expert@msgcu-sms:0]# df
Filesystem 1K-blocks Used Available Use% Mounted on
18578172 15204696 2429760 87% /
/dev/sda1 295561 37950 242351 14% /boot
tmpfs 8149888 4 8149884 1% /dev/shm
711017560 570455328 103862072 85% /var/log