run out of space?

Dear squiders,
I found my squid 1.1.3 will stop every 2 days,
I got the message from cache.log, it says:

97/01/13 00:00:24| 249856 lines written so far.
97/01/13 00:00:24| Finished. Wrote 251909 lines.
97/01/13 00:00:24| Took 21 seconds (11995.7 lines/sec).
97/01/13 00:00:24| stat_rotate_log: Rotating
97/01/13 00:00:24| useragentRotateLog: Rotating.
97/01/13 00:00:24| ftpInitialize: fork: (12) Not enough space
97/01/13 00:00:24| storeWriteCleanLog: Starting...
97/01/13 00:00:25| 4096 lines written so far.
97/01/13 00:00:25| 8192 lines written so far.

my configuration is

solaris 2.4, 128MB memory,
cache_mem 48MB, high 95%, low 90%
cache_swap 4096MB, high 92%, low 90%

i have a light load apache web server on the same machine.
and i use cron to rotate the log of apache and squid at 0:00 everyday.
Is there anyone who can help me to find out my problem?
I tried my best to figure out the problem, but failed.
Received on Sun Jan 12 1997 - 08:27:39 MST