ceph iscsi - stgt

root@ceph-client-01-[LOC]:~# ceph -s
    cluster 8be348fe-3cdd-443f-a69e-c2693846dc45
     health HEALTH_OK
     monmap e4: 3 mons at {0=10.114.160.50:6789/0,1=10.114.160.51:6789/0,2=10.114.160.52:6789/0}
            election epoch 92, quorum 0,1,2 0,1,2
     mdsmap e79: 1/1/1 up {0=b=up:active}, 1 up:standby
     osdmap e7101: 28 osds: 28 up, 28 in
            flags sortbitwise
      pgmap v1311491: 3840 pgs, 6 pools, 275 GB data, 90681 objects
            586 GB used, 21748 GB / 22334 GB avail
                3840 active+clean
  client io 8600 kB/s wr, 375 op/s
root@ceph-client-01-[LOC]:~# tgtadm --lld iscsi --mode system --op show
System:
    State: ready
    debug: off
LLDs:
    iscsi: ready
    iser: error
Backing stores:
    rbd (bsoflags sync:direct)
    sheepdog
    bsg
    sg
    null
    ssc
    rdwr (bsoflags sync:direct)
Device types:
    disk
    cd/dvd
    osd
    controller
    changer
    tape
    passthrough
iSNS:
    iSNS=Off
    iSNSServerIP=
    iSNSServerPort=3205
    iSNSAccessControl=Off
root@ceph-client-01-[LOC]:~# tgtadm --lld iscsi --mode target --op new --tid 1 --targetname rbd
root@ceph-client-01-[LOC]:~# tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 --backing-store "data/iscsi-image" --bstype rbd --bsopts "conf=/etc/ceph/ceph.conf;id=admin"
tgtadm: invalid request
root@ceph-client-01-[LOC]:~#

/var/log/syslog:
Apr 20 12:58:28 ceph-client-01 tgtd: device_mgmt(246) sz:74 params:path=data/iscsi-image,bstype=rbd,bsopts=conf=/etc/ceph/ceph.conf;id=admin
Apr 20 12:58:28 ceph-client-01 tgtd: bs_rbd_init(531) bs_rbd: ignoring unknown option ""
Apr 20 12:58:28 ceph-client-01 tgtd: bs_rbd_init(540) bs_rbd_init: confname /etc/ceph/ceph.conf
Apr 20 12:58:28 ceph-client-01 tgtd: bs_rbd_init(542) bs_rbd_init bsopts=;id=admin
Apr 20 12:58:28 ceph-client-01 tgtd: bs_thread_open(412) 16
Apr 20 12:58:28 ceph-client-01 tgtd: bs_rbd_open(432) bs_rbd_open: pool: data image: iscsi-image snap: 
Apr 20 12:58:28 ceph-client-01 tgtd: bs_rbd_open(442) bs_rbd_open: rbd_open: -2