if you use a large cache maybe you can experience squid process crash because you running-out of inodes.
Index node or inode is a table that
to troubleshooting type:
glitchlistlx@3n:~$ df -i Filesystem Inodes IUsed IFree IUse% Mounted on udev 922471 528 921943 1% /dev tmpfs 930373 805 929568 1% /run /dev/sda1 15630336 320220 15310116 3% / tmpfs 930373 92 930281 1% /dev/shm tmpfs 930373 5 930368 1% /run/lock tmpfs 930373 18 930355 1% /sys/fs/cgroup tmpfs 930373 44 930329 1% /run/user/1000
if the IUse% is 100% process like squid that writes on file system may have problems.
to search anormal use of inodes run the script and check the directories with an high use of inodes:
for inode in /*; do echo $inode; find $inode |wc -l; done
another trick: if you use SARG reporting on same squid machine it is likely that the “IUse 100%” is caused by SARG. So delete/move sarg-reports and back online with squid!