can't see block device with lsblk

[mmm286]

Hi,
I've configured a scsi device but I can't see with lsblk:

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lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda             8:0    0   35G  0 disk
├─sda1          8:1    0    1G  0 part /boot
└─sda2          8:2    0   34G  0 part
  ├─rhel-root 253:0    0 30,5G  0 lvm  /
  └─rhel-swap 253:1    0  3,5G  0 lvm  [SWAP]
sr0            11:0    1  4,2G  0 rom

But I can see session logged:

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[root@nodo2 ~]# iscsiadm -m session -P 3 | grep 'Target\|disk'
Target: iqn.2005-10.org.freenas.ctl:controlm (non-flash)
                Target Reset Timeout: 30
                        Attached scsi disk sdb          State: running

Do you know why? Thanks