Hi, I've found that a cause of Input/output error when I mount the cephfs, however, I'm not sure which part should be improved ( perhaps me ), but this error would occur when your client has more than 1 network address. Environment setting: Ceph mon listen on 192.168.10.1:6789 Ceph client use private ip: 192.168.100.11 public ip: 140.113.98.244 --------------------------------------------------- << ceph client node >> # ip r 192.168.10.0/24 dev eth0 scope link # mount -t ceph 192.168.10.1:/ /mnt/ceph -o name=admin,secret=<adminscret> mount error 5 = Input/output error # netstat -ntu tcp 0 0 140.113.98.244:57667 192.168.10.1:6789 ESTABLISHED << ceph mon node >> # tail mon.log Aug 2 21:53:57 ceph1 ceph-mon: 2012-08-02 21:53:57.348598 7f19d62cc700 0 mon.0@0(leader) e5 handle_command mon_command(status v 0) v1 Aug 2 21:54:59 ceph1 ceph-mon: 2012-08-02 21:54:59.277523 7f19d31a9700 0 -- 192.168.10.1:6789/0 >> 140.113.98.244:0/1892356839 pipe(0x299a000 sd=33 pgs=0 cs=0 l=0).accept peer addr is really 140.113.98.244:0/1892356839 (socket is 140.113.98.244:57667/0) --------------------------------------------------- Another successful tries << ceph client node >> # ip r 192.168.10.0/24 dev eth0 proto kernel scope link src 192.168.100.11 # mount -t ceph 192.168.10.1:/ /mnt/ceph -o name=admin,secret=<adminscret> Ok # netstat -ntu tcp 0 0 192.168.100.11:40545 192.168.10.1:6789 ESTABLISHED << ceph mon node >> # tail mon.log Aug 2 22:00:51 ceph1 ceph-mon: 2012-08-02 22:00:51.456517 7f19d31a9700 0 -- 192.168.10.1:6789/0 >> 192.168.100.11:0/3665654333 pipe(0x2e54780 sd=33 pgs=0 cs=0 l=0).accept peer addr is really 192.168.100.11:0/3665654333 (socket is 192.168.100.11:40545/0) Aug 2 22:00:52 ceph1 ceph-mon: 2012-08-02 22:00:52.531184 7f19d62cc700 0 log [INF] : pgmap v194887: 3472 pgs: 3472 active+clean; 274 MB data, 18458 MB used, 12616 GB / 12668 GB avail For your reference, Thanks. Chuanyu -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html