Непонятная проблема

[Михаил Митрофанов]

Добрый день!
 
Есть в конфиге:
 
/etc/nginx/http.d/elec.conf
1. ### Elec.ru
2. 
3.   upstream elec_new {
4.     server srv2:8101  weight=1  fail_timeout=30;
5.     server srv3:8101  weight=1  fail_timeout=30;
6.     server srv1:8101  backup;
7.   }
8. 
9.   upstream elec_old {
10.    server srv2:8102  weight=1  fail_timeout=30;
11.    server srv3:8102  weight=1  fail_timeout=30;
12. }

nginx выдает ошибку:
[emerg] 5948#0: invalid parameter "backup" in /etc/nginx/http.d/elec.conf:6
 
nginx version: nginx/0.5.33
 
Как лечить?
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