I am currently using nginx to serve downloads off my website. Users sometimes need to wait about 5 seconds before their download starts after clicking a download link. I'm not sure if I need to start using raid 10 (I'm currently using raid 50) or if this is a problem with my nginx configuration. I am also on a 1gbit line but download sometimes go as low as 10kB/s. My server: Dual Xeon 5620 CPU, 12x2TB drives with 8GB ram.

This is my nginx.conf

#user  nobody;
worker_processes  12;
worker_rlimit_nofile 10240;
worker_rlimit_sigpending 32768;

error_log  logs/error.log  crit;

#pid        logs/nginx.pid;


events {
    worker_connections  2048;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    access_log  off;
    limit_conn_log_level info;
    log_format  xfs  '$arg_id|$arg_usr|$remote_addr|$body_bytes_sent|$status';

    #sendfile       on;
    #tcp_nopush     on;
    reset_timedout_connection on;

    server_tokens off;
    autoindex off;

    keepalive_timeout  0;
    #keepalive_timeout  65;

    limit_zone one $binary_remote_addr 10m;
    perl_modules  perl;
    perl_require  download.pm;