Disk usage 98% of 30G

[isoliman]

Please advise how can return the free scape back again to normal
Thanks

4.5G /var/squid/cache
4.0k /var/squid/acl
23G /var/squid/logs
27G /var/squid
[2.1.5-RELEASE][root@firewall.local]/var/squid/logs(29): df -h
Filesystem    Size    Used  Avail Capacity  Mounted on
/dev/da0s1a    30G    28G    459M    98%    /
devfs          1.0k    1.0k      0B  100%    /dev
/dev/md0      3.6M    52k    3.3M    2%    /var/run
devfs          1.0k    1.0k      0B  100%    /var/dhcpd/dev

[Abhishek]

From squid settings enable Rotate Logs  and enter number of days u want to keep the logs  ,

how long back did you install the squid package?

[isoliman]

From squid settings enable Rotate Logs  and enter number of days u want to keep the logs  ,

It's already configured "Log rotate is 7 days"
I have did some command and resolve the problem
df -h - check what is consuming space

rm -rf /var/squi/cache/*  - clear cache log

squid -z - rebuild cache

rm -rf  /var/squid/logs/*  - clear old logs

[2.1.5-RELEASE][root@firewall.fairtrans.local]/root(5): df -h
Filesystem    Size    Used  Avail Capacity  Mounted on
/dev/da0s1a    30G    5.0G    23G    18%    /
devfs          1.0k    1.0k      0B  100%    /dev
/dev/md0      3.6M    52k    3.3M    2%    /var/run
devfs          1.0k    1.0k      0B  100%    /var/dhcpd/dev

how long back did you install the squid package?
Since 2014
2.1.5-RELEASE (i386)
built on Mon Aug 25 07:44:26 EDT 2014
FreeBSD 8.3-RELEASE-p16

Please advise is it possible to upgrade without missing the current settings and configuration for the server
Update available. Click Here to view update.
A new version is now available

Current version: 2.1.5-RELEASE
      Built On: Mon Aug 25 07:44:26 EDT 2014
    New version: 2.3-RELEASE

Update source: https://updates.pfsense.org/_updaters