Dead slow response from server
I've got an issue on our server and looking for some solutions, please.
I have several websites hosted on the server, running:
CPU: Dual Processor Quad Core Xeon 5520 - 2.26GHz (Nehalem) - 2 x 8MB cache w/HT
Memory: 12GB ram
hard drive type/configuration: 4x 147GB SAS 15k in RAID-10, Adaptec 5405 Card
Linux: CENTOS 5.8 x86_64 standard
Webserver: Litespeed Web Server - Enterprise Edition - Version 4.2.1
PHP version: PHP 5.3.8
MySQL version: 5.0.96
When I first installed litespeed, switching from apache, the speeds were very good, performance was good, pages loaded fast! Recently, over the past couple of months, two high traffic websites on the same server have started showing performance degradation and slowness = a lot of users complaining.
All websites used wordpress, vbulletin with pretty much same configuration and other websites are loading just fine, no hangup, no waiting for response.
I have w3 cache and cdn enabled for all of them as well... as I said, it was good but not anymore. I can't figure out what is causing two websites (one wordpress+vbulletin and other is just vbulletin forum) but the loading times are killing me!!!
I see mysql cpu high sometimes but that should effect all websites not just two, no? Plus, server load could be in single digits and still same slowness.
If I enable apache (switching back to apache) the server just stops responding, the server load goes high into 100, 150+ and then its really dead.
Any help would be appreciated, thanks
Last edited by dotpro; 01-16-2013 at 02:49 PM..