Replace node in Ceph Cluster

[yena]

Hello,
i'm testing the replacement of a node in a ceph cluster.
I have this problem:

pveceph createmon
monitor address '10.10.10.3:6789' already in use by 'mon.2'
( mon 2 was the failed node )

I have done:
pveceph destroymon 2
monitor filesystem '/var/lib/ceph/mon/ceph-2' does not exist on this node

and

root@n3:~# ceph mon remove 2
removing mon.2 at 10.10.10.3:6789/0, there will be 3 monitors

root@n3:~# ceph mon dump
dumped monmap epoch 5
epoch 5
fsid 1126f843-c89b-4a28-84cd-e89515b10ea2
last_changed 2017-03-27 13:57:05.063105
created 2017-03-21 17:16:58.365129
0: 10.10.10.1:6789/0 mon.0
1: 10.10.10.2:6789/0 mon.1
2: 10.10.10.4:6789/0 mon.3

But with the old ip 10.10.10.3 i still have the error.

Thanks