Проблемы с Nginx

Добрый день.

Имеется достаточно загруженный мощный файловый сервер. в сутки около 35к пользователей. Плюс файлы грузят на большой скорости например в пики до 135мбит канала жрет, файлы размером от 100мб до 2000мб, большинство более 1гб.

Поэтому недавно после смены сервера на более мощный решил уже поставить на нжиникс. Прикрутил к нему пхп на фастСЖИ. Установил все летает. Но бывает такие моменты когда сайт раз и отрубается не грузит ничего а в еррор-логах пишет это код внизу, длится пару минут, потом нормально начинает работать. Нагрузки на машину нету смотрел все ок. Что бы это могло быть??

[error] 9640#0: *44118 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 90.189.86.18, server

[error] 9640#0: *44119 writev() failed (54: Connection reset by peer) while sending request to upstream, client: 90.189.86.18, server: domain.com, request: "GET /img/rand_

[error] 9640#0: *42620 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 89.113.208.163, server: domain.com, request: "GE

[error] 9641#0: *43656 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 85.181.133.192, serv

[error] 9641#0: *39914 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 89.232.197.225, server: domain.com, request: "GET

[error] 9641#0: *43655 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 85.181.133.192, serv

[error] 9641#0: *43653 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 85.181.133.192, serv

[error] 9641#0: *43654 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 85.181.133.192, serv

[error] 9638#0: *42624 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 81.1.252.1, server: domain.com, request: "GET /mov

[error] 9641#0: *39914 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 89.232.197.225, serv

[error] 9639#0: *42628 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 89.232.197.225, server: domain.com, request: "GET

[error] 9641#0: *39914 writev() failed (32: Broken pipe) while sending request to upstream, client: 89.232.197.225, server: domain.com, request: "GET /img/rand_logo.php?s=

[error] 9638#0: *42636 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 93.100.241.148, server: domain.com, request: "GET /p

[error] 9638#0: *42639 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 80.251.113.10, server: domain.com, request: "GET /

[error] 9638#0: *42640 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 80.251.113.10, server: domain.com, request: "GET /

[error] 9639#0: *43572 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 77.52.119.215, serve

[error] 9640#0: *41115 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 93.81.187.189, server: domain.com, request: "GET /

[error] 9641#0: *44148 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 83.102.161.100, serv

[error] 9640#0: *44149 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 83.102.161.100, serv

[error] 9640#0: *43151 writev() failed (32: Broken pipe) while sending request to upstream, client: 94.51.75.189, server: domain.com, request: "GET /cat/ HTTP/1.1", upstre

[error] 9640#0: *44154 writev() failed (54: Connection reset by peer) while sending request to upstream, client: 92.253.31.61, server: domain.com, request: "GET /port.php?ID

[error] 9641#0: *44156 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 84.42.8.173, server:

[error] 9641#0: *44148 writev() failed (54: Connection reset by peer) while sending request to upstream, client: 83.102.161.100, server: domain.com, request: "GET /img/ran

[error] 9640#0: *44149 writev() failed (32: Broken pipe) while sending request to upstream, client: 83.102.161.100, server: domain.com, request: "GET /img/rand_logo.php?s=

[error] 9641#0: *44157 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 84.42.8.173, server:

[error] 9639#0: *44163 kevent() reported about an closed connection (54: Connection reset by peer) while reading response header from upstream, client: 62.221.38.93, server

[error] 9641#0: *44148 writev() failed (54: Connection reset by peer) while sending request to upstream, client: 83.102.161.100, server: domain.com, request: "GET /img/ran

[error] 9640#0: *44176 kevent() reported that connect() failed (54: Connection reset by peer) while connecting to upstream, client: 89.218.65.106, server: domain.com, requ

[error] 9640#0: *44177 writev() failed (54: Connection reset by peer) while sending request to upstream, client: 89.218.65.106, server: domain.com, request: "GET /img/rand

[error] 9640#0: *42660 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 195.189.108.66, server: domain.com, request: "GET

[error] 9641#0: *42663 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 195.189.108.66, server: domain.com, request: "GET

[error] 9641#0: *42665 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 195.189.108.66, server: domain.com, request: "GET

[error] 9641#0: *42668 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 195.189.108.66, server: domain.com, request: "GET

[error] 9640#0: *42679 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 79.223.184.254, server: domain.com, request: "GE

[error] 9638#0: *42699 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 90.188.34.97, server: domain.com, request: "GET /l

[error] 9638#0: *42696 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 92.112.231.232, server: domain.com, request: "GET

[error] 9638#0: *42697 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 92.112.231.232, server: domain.com, request: "GET

[error] 9640#0: *42713 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 92.113.138.77, server: domain.com, request: "GET /

[error] 9638#0: *41679 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 92.47.223.164, server: domain.com, request: "POST

И еще помогите пожалуйста оптимально настроить конфиг нжиникса под мои требования, и под нагрузки.

вот то что настроено сейчас:

user nobody nobody;

worker_processes  4;



error_log  logs/error.log warn;



pid        logs/nginx.pid;



events {

worker_connections  4096;

use kqueue;

}





http {

    include       mime.types;

    default_type  application/octet-stream;



    log_format  main  '$remote_addr - $remote_user [$time_local] $request '

                      '"$status" $body_bytes_sent "$http_referer" ';



    access_log  logs/access.log main;



    sendfile       on;

    tcp_nopush     on;

    tcp_nodelay    on;



    client_header_timeout  3m;

    client_body_timeout    3m;

    send_timeout           3m;



    client_header_buffer_size    1k;

    large_client_header_buffers  4 4k;



    keepalive_timeout  40;

    server_names_hash_max_size 2048;

    server_names_hash_bucket_size 128;

Информация о машине

ОС ФриБСД 7

2 квард кора ксеона четырех ядерника 2,5гц

8Гб оперативка

массив жестких 16 дисков по 1тб

Буду очень признателен за любую помощь. Спасибо.