sh - Source Hashing: assigns jobs to servers through looking up a statically assigned hash table by their source IP addresses.
rr - Robin Robin: distributes jobs equally amongst the available real servers.
¡Ø sh, rr ½ºÄ³ÁÙ¸µ weight°ªÀ» 2·Î ¼³Á¤ÇßÁö¸¸ ¶È°°Àº Ä¿³Ø¼öÄ¡°¡ °°À½ / weight ¿É¼Ç ¹Ý¿µ¾ÈµÊ
wrr - Weighted Round Robin: assigns jobs to real servers proportionally to there real servers¡¯ weight.
Servers with higher weights receive new jobs first and get more jobs than servers with lower weights.
Servers with equal weights get an equal distribution of new jobs.