[squid-users] cache_dir size problem

Hi
This is my cache_dir line in squid.conf
cache_dir ufs /cache 3500 16 256

my /cache total size is 3.9G
df -h shows this for /cache
/dev/sda5 3.9G 3.7G 272M 94% /cache

If I have limit /cache to 3500MB, why is its size growing much higher then that? I also have these lines in my cache.log

2004/02/27 22:34:55| WARNING: Shrinking cache_dir #0 to 2862576 KB
2004/02/27 22:34:55| diskHandleWrite: FD 69: disk write error: (28) No space left on device
2004/02/27 22:34:55| storeUfsWriteDone: got failure (-6)
2004/02/27 22:34:55| storeSwapOutFileClosed: dirno 0, swapfile 0001BF33, errflag=-6
        (28) No space left on device
2004/02/27 22:34:55| WARNING: Shrinking cache_dir #0 to 2862572 KB
2004/02/27 22:34:55| diskHandleWrite: FD 103: disk write error: (28) No space left on device
2004/02/27 22:34:55| storeUfsWriteDone: got failure (-6)
2004/02/27 22:34:55| storeSwapOutFileClosed: dirno 0, swapfile 0001BF33, errflag=-6
        (28) No space left on device

Is there something wrong???

Regards,
Babar

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