iSCSI configuration with existing extents from old Freenas

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Recently stopped using FreeNas where I had set up a zfspool with 3 extents which were shared over iscsi.

I am now using these disks in a RHEL 7.2 server and want to reshare the existing zfspool using iscsi (as I had been doing with FreeNas)

I have installed and setup zfs which picked up the existing pool:

[root@sycamore ~]# zpool status
pool: STORAGE
state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(5) for details.
scan: none requested
config:

NAME                                          STATE     READ WRITE CKSUM
STORAGE                                       ONLINE       0     0     0
  mirror-0                                    ONLINE       0     0     0
    ata-ST2000DL003-9VT166_5YD2PYT4           ONLINE       0     0     0
    ata-WDC_WD20EFRX-68AX9N0_WD-WMC300200707  ONLINE       0     0     0
  mirror-1                                    ONLINE       0     0     0
    ata-ST2000DL003-9VT166_6YD1FVPV           ONLINE       0     0     0
    ata-ST32000542AS_6XW1YDN4                 ONLINE       0     0     0

errors: No known data errors
[root@sycamore ~]# df -h
Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/rhel_sycamore-root00  215G  4.0G  211G   2% /
devtmpfs                           24G     0   24G   0% /dev
tmpfs                              24G  1.3M   24G   1% /dev/shm
tmpfs                              24G  9.5M   24G   1% /run
tmpfs                              24G     0   24G   0% /sys/fs/cgroup
/dev/sde1                         247M  208M   39M  85% /boot
/dev/mapper/rhel_sycamore00-home  699G  193M  699G   1% /home
tmpfs                             4.8G   16K  4.8G   1% /run/user/1000
STORAGE                           3.6T  1.6T  2.0T  44% /STORAGE
STORAGE/.samba4                   2.0T  128K  2.0T   1% /STORAGE/.samba4

I have also set up an iscsi target and portal but am not sure how to associate the existing extents to the target:

[root@sycamore STORAGE]# ls -l 
total 1636815334
-rw-r--r--. 1 root root 1650878054400 Oct 18 17:56 extent
-rw-r--r--. 1 root root 1100585369600 Oct 18 19:31 extent2
-rw-r--r--. 1 root root 1100585369600 Oct 18 17:56 extent3
[root@sycamore STORAGE]# pwd
/STORAGE

[root@sycamore ~]# targetcli
targetcli shell version 2.1.fb41
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> ls
o- / ........................................................................................................... [...]
  o- backstores ................................................................................................. [...]
  | o- block .................................................................................... [Storage Objects: 0]
  | o- fileio ................................................................................... [Storage Objects: 0]
  | o- pscsi .................................................................................... [Storage Objects: 0]
  | o- ramdisk .................................................................................. [Storage Objects: 0]
  o- iscsi .............................................................................................. [Targets: 1]
  | o- iqn.2003-01.org.linux-iscsi.sycamore.x8664:sn.253bc772ce44 .......................................... [TPGs: 1]
  |   o- tpg1 ................................................................................. [no-gen-acls, no-auth]
  |     o- acls ............................................................................................ [ACLs: 0]
  |     o- luns ............................................................................................ [LUNs: 0]
  |     o- portals ...................................................................................... [Portals: 1]
  |       o- 192.168.2.10:3260 .................................................................................. [OK]
  o- loopback ........................................................................................... [Targets: 0]
/> 

How can I complete what I need to do ?

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