hi, install iscsi gateway as write 
http://docs.ceph.com/docs/master/rbd/iscsi-overview/
kernel version 4.16.1
ceph v12.2.10 Luminous
early i use tgt iscsi target i can connect 3 esxi server to one LUN as a shared 
drive and if one esxi was dropped the machines were transferred to others from 
the same storage
Now when I try to connect one LAN to 3 servers, I get an error on the ceph 
server

Dec 29 07:24:29 ceph-node1 tcmu-runner: tcmu_notify_lock_lost: 209 rbd / 
main_pool.store: Async lock drop. Old state 1
Dec 29 07:24:30 ceph-node1 tcmu-runner: alua_implicit_transition: 566 rbd / 
main_pool.store: Starting lock acquisition operation.
Dec 29 07:24:30 ceph-node1 tcmu-runner: tcmu_rbd_lock: 757 rbd / 
main_pool.store: Acquired exclusive lock.
Dec 29 07:24:35 ceph-node1 tcmu-runner: alua_implicit_transition: 566 rbd / 
main_pool.store: Starting lock acquisition operation.

such a scheme is possible in this configuration?
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