squid cache_dir not getting objects

[Benjamin <benjo11111@xxxxxxxxx>]

Hi,

I configured 4 cache_dir in squid.conf

cache_dir aufs /c1 75776 64 512
cache_dir aufs /c2 102400 64 512
cache_dir aufs /c3 102400 64 512
cache_dir aufs /c4 102400 64 512

But when i check df -kh on server, i got

/dev/sda4              99G  189M   94G   1% /c1
/dev/sdb1             135G   17G  112G  13% /c2
/dev/sdc1             135G   17G  112G  13% /c3
/dev/sdd1             135G   17G  112G  13% /c4

It is showing that /c1 is not taking objects on disk and other 
directories are having objects on disk.What could be the reason of it?

Regards,
Benjamin