Ubuntu iSCSI partition is not visible in lsblk
Solution 1:
The first command you listed is a discovery. Server is sending the iSCSI targets available to the initiator. Now you should login the the target. You can use the following example:
iscsiadm -m node -l -T iqn.2020-09.tech.biowar.storagesrv01.target01
Afterwards, the following command will list the connected target and details. At the end of the output you will see where the scsi disk is attached.
iscsiadm -m session -P 3