Unable to locate iSCSI volumes on host

[usao]

I have a Qnap 459 Pro Plus.
I setup the iscsi target service and created and mapped a lun.
The client initiator is running on Centos 6.8.
I see the following output, but I do not see the lun.

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# iscsiadm -m discovery -t st -p qnap0
10.0.0.184:3260,1 iqn.2004-04.com.qnap:ts-459proplus:iscsi.backupl0.cca0b0
10.0.0.80:3260,1 iqn.2004-04.com.qnap:ts-459proplus:iscsi.backupl0.cca0b0
# iscsiadm -m node -T iqn.2004-04.com.qnap:ts-459proplus:iscsi.backupl0.cca0b0 --login
# grep "Attached SCSI" /var/log/messages

Nothing except the existing FC luns shows up.

[usao]

I am showing this on the host:

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# iscsiadm -m session -o show
tcp: [7] 10.0.0.80:3260,1 iqn.2004-04.com.qnap:ts-459proplus:iscsi.backupl0.cca0b0 (non-flash)

This appears to be my lun, but I don't see any scsi device which were not there before.

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# fdisk -l | grep 'Disk.*bytes'
Disk /dev/sda: 8589 MB, 8589934592 bytes
Disk /dev/sdc: 1650.0 GB, 1649999937536 bytes
Disk /dev/sdb: 1650.0 GB, 1649999937536 bytes
Disk /dev/sde: 1650.0 GB, 1649999937536 bytes
Disk /dev/sdd: 1650.0 GB, 1649999937536 bytes