Falling cloud with 200 simultaneous accesses

Question

I have a cloud with the following configuration: Xeon E5420 8x 2.50Ghz, 5GB de ram SSD RAID 10 4x priority - 24 CPU Core e 6TB de banda, but when it reaches 150 to 200 simultaneous accesses it starts to get slow and sometimes even drops the server, what could be done to improve it? I have another server with the same configuration I can peak up to 1300 simultaneous accesses and never happened this.

Observing: Always has 60% memory free.

Answer 1

Try adding/changing this in your . htaccess file

<IfModule mpm_worker_module>
    ServerLimit          40
    StartServers          2
    MaxClients          1000
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadsPerChild      25
    MaxRequestsPerChild   0
</IfModule>

Change Maxclients to the number you want.

You can be more around here: http://www.genericarticles.com/mediawiki/index.php?title=How_to_optimize_apache_web_server_for_maximum_concurrent_connections_or_increase_max_clients_in_apache