Ceph

Hi all,
i found an error in ceph osd log file.in my osd tree, there're 2 osd marked down, not running.
in osd1(192.168.4.101) log:
192.168.4.101:6828/10551 >> 192.168.4.104:6809/1218 pipe(0x5005000 sd=55 :35763 s=1 pgs=574 cs=4 l=0).connect error 192.168.4.104:6809/1218, 111: Connection refused
in osd3(192.168.4.103) log:
192.168.4.103:6826/16315 >> 192.168.4.104:6809/1218 pipe(0x53f3a00 sd=75 :44172 s=1 pgs=566 cs=4 l=0).connect error 192.168.4.104:6809/1218, 111: Connection refused
the two ceph-osd processes seem to connect to osd.4, but failed.
in osd4(192.168.4.104) log:
192.168.4.104:6809/1218 >> 192.168.4.103:6832/16097 pipe(0x2922780 sd=43 :45945 s=2 pgs=5128 cs=3 l=0).reader got old message 5 <= 75 0x1f30400 osd_map(1844..1883 src has 1373..1883) v3, discarding

And I’m trying connect to 192.168.4.104:6809...and the connection established.

Anyone be able to explain these findings?

BR
chen