hi , 1-ive removed contents of rock in my folders /CACHE1 & /CACHE2 2-made sure that squid is not running 3-squid -z 4-started squid and i will monitor it within 48 hours and c the result about mounting options : ============================================================================ [root@squid ~]# cat /etc/fstab # /etc/fstab # Created by anaconda on Tue Oct 29 12:35:49 2013 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=51e30005-ffc4-4ba1-844f-54ac00cada80 / ext4 defaults 1 1 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 ############################################################### shm /dev/shm tmpfs nodev,nosuid,noexec 0 0 /dev/sdb2 /CACHE1 ext4 noatime,barrier=0,data=writeback,commit=100 0 2 ========================================================================= the folder /CACHE2 is on the same with disk operating system . regards ----- Dr.x -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/SMP-Rock-frequent-FATAL-Received-Segment-Violation-dying-only-on-kid3-tp4663349p4663356.html Sent from the Squid - Users mailing list archive at Nabble.com.