Hi, My squid box was restarted with following message in cache.log. 2008/08/01 15:18:04| assertion failed: disk.cc:242: "fdd->write_q->len > fdd->write_q->buf_offset" 2008/08/01 15:18:07| Starting Squid Cache version 3.0.STABLE7 for i686-redhat-linux-gnu... I am using coss with squid3.0 STABLE7 on the RHEL4(x86) server. The setting of my coss is this. cache_dir coss /var/spool/squid/cache/coss1 2048 block-size=512 max-size=40000 cache_dir coss /var/spool/squid/cache/coss2 2048 block-size=512 max-size=40000 cache_dir coss /var/spool/squid/cache/coss3 2048 block-size=512 max-size=40000 cache_swap_log /var/spool/squid/cache/%s What could be the best way to get rid of this problem. thanks any ways.