Dear ALL, We have a squid server with high volume of traffic, 200 – 300 MB. The server is in transparent mode and using 18GB of ramdisk. With this configuration performance is very good (after optimizing the squid and the linux machine). The problem is the small size of cache directory. Since IO is a big issue with squid we purchased the intel ssd x25-m 160gb with hope that a flash drive will overcome the IO problems. Unfortunately we failed. After adding the SSD disk and configuring squid to use another cache directory we encountered high IO that led to performance degradation. We have tried using AUFS and even downgrading to version 2.6 and using COSS with no success. Does any one have an idea how to overcome the IO problems? Do you have a suggestion to configuring squid in a big enterprise with big traffic volume? We have searched the WEB and used as reference links such as: http://www.freeproxies.org/blog/2007/10/03/squid-cache-disk-io-performance-enhancements/ http://blog.last.fm/2007/08/30/squid-optimization-guide Platform: x3455 – 2 x dual core opteron 2.5Ghz OS Memory: 32GB (24GB to ramdisk) OS: Linux RHEL 5.0 Squid configuration: acl manager proto cache_object acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8 acl localnet src 10.0.0.0/8 # RFC1918 possible internal network acl localnet src 172.16.0.0/12 # RFC1918 possible internal network acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl ib src XXXXXXXXXXXXXX acl mgt src XXXXXXXXXXXXX acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow ib icp_access allow localnet icp_access deny all htcp_access allow localnet htcp_access allow all http_port 3128 transparent hierarchy_stoplist cgi-bin ? cache_mem 100 MB maximum_object_size_in_memory 34 KB cache_replacement_policy heap LFUDA cache_dir ufs /tmp/ramdiskt 18000 16 256 maximum_object_size 8 MB cache_swap_low 90 cache_swap_high 95 access_log none cache_store_log none refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern (cgi-bin|\?) 0 0% 0 refresh_pattern . 0 20% 4320 half_closed_clients off shutdown_lifetime 10 seconds snmp_access allow ibsnmp mgt snmp_access allow ibsnmp snmp_access deny all snmp_incoming_address 0.0.0.0 snmp_outgoing_address 255.255.255.255 icp_port 0 log_icp_queries off dns_nameservers XXXXXXXX hosts_file /etc/hosts client_db off coredump_dir /var/spool/squid pipeline_prefetch on Regards. -- View this message in context: http://www.nabble.com/Squid-high-bandwidth-IO-issue-%28ramdisk-SSD%29-tp24775448p24775448.html Sent from the Squid - Users mailing list archive at Nabble.com.
