А fail_timeout в ngx_http_upstream_module работает?

["Dmitry Y. Labutin" <dmitry@xxxxxxxxxxx>]

Доброго времени суток.

Имею вот такой конфиг:
worker_processes  10;

events {
    worker_connections  1024;
}

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

    sendfile        on;
    keepalive_timeout  65;

    upstream backend {
        server www4.company.ru backup;
        server www1.company.ru fail_timeout=600s;
        
        keepalive 64;
    }

    server {
        listen       80;
        server_name  *.company.ru;

        client_max_body_size 50m;

        location / {
            proxy_set_header Host $host;
            proxy_pass http://backend;
            proxy_read_timeout 180s;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

    }
}


Именно сейчас www1.company.ru недоступен - лег канал.
Я надеялся, что попытки nginx отправить запрос пользователей через 
www1.company.ru будут идти раз в 10 минут, но на деле, там очень много 
вот такого в error.log:
2012/07/08 09:42:02 [error] 10904#0: *5715 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 
212.33.247.144, ...
2012/07/08 09:42:03 [error] 10904#0: *5718 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 78.46.87.66, ...
2012/07/08 09:42:04 [error] 10904#0: *5720 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 195.69.65.3, ...
2012/07/08 09:42:08 [error] 10904#0: *5724 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 
178.44.179.181, ...
2012/07/08 09:42:09 [error] 10904#0: *5726 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 
79.122.162.102, ...
2012/07/08 09:42:09 [error] 10904#0: *5728 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 2.92.46.112, ...
2012/07/08 09:42:09 [error] 10904#0: *5732 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 
93.181.202.77, ...
2012/07/08 09:42:09 [error] 10904#0: *5731 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 2.92.46.112, ...
2012/07/08 09:42:09 [error] 10904#0: *5735 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 2.92.46.112, ...
2012/07/08 09:42:10 [error] 10904#0: *5737 connect() failed (110: 
Connection timed out) while connecting to upstream, client: 85.26.234.5, ...
Вопрос - почему nginx делает так много попыток соединения через 
www1.company.ru ? Ведь он же получил Connection timed out и должен был в 
соответствии с fail_timeout=600s 10 минут туда не соваться!!!
Или я что-то не так настроил?

Дмитрий Лабутин

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