Make sure you are running a recommend version:
Delete the older software packages in Device->Software.
Also check out this article on this topic:
we are using PAN OS 10.1.3 ON PA-220 DEVICE
Root partition high usage
/dev/root 3.8G 3.3G 303M 92% /
none 2.0G 60K 2.0G 1% /dev
/dev/mmcblk0p5 13G 5.1G 6.7G 43% /opt/pancfg
/dev/mmcblk0p6 3.8G 997M 2.6G 28% /opt/panrepo
tmpfs 2.0G 504M 1.5G 26% /dev/shm
cgroup_root 2.0G 0 2.0G 0% /cgroup
/dev/mmcblk0p8 3.7G 1.5G 2.1G 43% /opt/panlogs
/dev/loop0 111M 5.6M 100M 6% /opt/panlogs/wildfire/tmpfile
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