Apache Server with memcache, varnish and php slow request times

Posted by coolestdude1 on Server Fault See other posts from Server Fault or by coolestdude1
Published on 2012-06-26T19:29:05Z Indexed on 2012/06/26 21:18 UTC
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My issue is that these servers are taking rather long for request about 2 seconds on average just to serve files. When we had just one server doing everything it was noticeably faster even with the same web app (Drupal 6 and Drupal 7). I want to get this number down to a reasonable level and so I need some help getting to the bottom of why the request times are so slow.

This can cause the webapp to hang on post or put and generally leads to a bad user experience on my sites.

PS: I am more of a server newbie so this has confounded me for quite some time.

The domains: collabornation.net nptrainingworks.com (they run off the same two webservers using vhost configs)

The Gear: Two Rackspace 4 Gig servers running CentOS 6.2 Final They have a mounted file system (gluster) that is used to keep files the same on both machines. They are behind a rackspace load balancer running round robin. Mysql is run using php-pdo and php-mysql as such mysql is run on another instance running memcache on that machine with phpMyAdmin located there as well.

Apache version number 2.2.15-15.el6.centos.1 (httpd.x86_64) Varnish version number 3.0.2-1.el5 (varnish.x86_64) PHP version number 5.3.14-1.el6.remi (php.x86_64)

Configs Linked Below

Again need some help, much appreciated!