[root@192_168_1_81 ~]# telnet 192.168.1.80 11311
Trying 192.168.1.80...
Connected to 192.168.1.80.
Escape character is '^]'.
stats
memcached agent v0.6
matrix 1 -> 192.168.1.79:11211, pool size 0
matrix 2 -> 192.168.1.80:11211, pool size 0
END
set bk1 0 0 2
11
STORED
set bk2 0 0 2
12
^]
telnet> quit
Connection closed.
[root@192_168_1_80 ~]#
2015-06-02 16:49:02: (magent.c.1910) NEW CLIENT FD 7
2015-06-02 16:49:31: (magent.c.897) BACKUP KEY "bk1" -> 192.168.1.81:11211
2015-06-02 16:49:31: (magent.c.996) SET KEY "bk1" -> 192.168.1.80:11211
2015-06-02 16:49:31: (magent.c.1208) CONNECTED FD 9 <-> 192.168.1.80:11211
2015-06-02 16:49:31: (magent.c.1502) CONNECTED BACKUP FD 8 <-> 192.168.1.81:11211
2015-06-02 16:49:31: (magent.c.596) PUT SERVER FD 9 -> POOL
2015-06-02 16:49:31: (magent.c.596) PUT SERVER FD 8 -> POOL
2015-06-02 16:49:44: (magent.c.883) GET SERVER FD 8 <- POOL
2015-06-02 16:49:44: (magent.c.897) BACKUP KEY "bk2" -> 192.168.1.81:11211
2015-06-02 16:49:44: (magent.c.996) SET KEY "bk2" -> 192.168.1.79:11211
exiting
更換版本到0.5版本解決.