How to Configure ISCI Target& Initiator on REHEL7

Step_By_Step_GUIDE To Configure ISCSI Target and Initiator on RHEL07
1: set hostname

hostnamectl set-hostname iscsihost.example.local
2: Install packages.
On Target:
Package: targetcli
Provides the targetcli shell to configure LIO (Linux I/O Target), the in-kernel iSCSI target framework
yum install targetcli
On Initiator:
yum install iscsi-initiator-utils
Provides iscsiadm, iscsid, and related tools to discover and log in to iSCSI targets.
3: Enter targetcli shell.

targetcli
ls
It will show:
BLOCK = Block-device based LUN Storage Space like Disk e.g. /dev/sdb.
FILEIO = File based LUN Storage Space like file created with dd command.
PSCSI = (SCSI Pass-through) Physical Disk based LUN Storage Space like CD-ROM.
RamDisk= Ramdisk based LUN Storage Space for higher IO speed
4: Create a Backstore.

/backstores/block create backstore01 /dev/sdb
ls
5: Create ISCI Target

/iscsi create
This will :
• Creates a new iSCSI target node under /iscsi

• Assigns it a unique IQN (iSCSI Qualified Name)

• Initializes a TPG (Target Portal Group) called tpg1

• Prepares the structure where you’ll later:

• Add LUNs

• Configure ACLs

• Set portals (IP + port)

• Enable authentication

A TPG is a container inside an iSCSI target that defines how initiators connect to the target.
6: Exposes a real disk (block device) to iSCSI clients by attaching it as a LUN under the target.

/iscsi/iqn.2003-01.org.linux-iscsi.server.x8664:sn.89b50c23d34a/tpg1/luns create /backstores/block/backstore

ls
7: Allows a specific iSCSI initiator to access your target.

Go to Client & Copy IQN Number with cp /etc/iscsi/initiatorname.iscsi & return to Host**

Client Terminal:

cat /etc/iscsi/initiatorname.iscsi
Host Terminal: where you left before moving to client terminal:
/iscsi/iqn.2003-01.org.linux-iscsi.server.x8664:sn.89b50c23d34a/tpg1/acls create iqn.1994-05.com.redhat:3e9d906e8

ls

exit
8: If firewalld is enabled, add port 3260/tcp to firewall rules.

sudo firewall-cmd --permanent --add-port=3260/tcp
sudo firewall-cmd --reload
Client Configuration: (RHEL 7):
1: Set host Name

hostnamectl set-hostname initiator.example.local
hostnamectl
2: install packages

yum install -y iscsi-initiator-utils
3: Check available Disks

lsblk
OR

fdisk -l
4: Run Following Commands

iscsiadm --help
5: Dicover Target:

iscsiadm -m discovery -t sendtargets -p 192.168.1.104
• -m discovery → use discovery mode

• -t sendtargets → use the SendTargets discovery method

• -p 192.168.1.104 → IP of the iSCSI target server

Discovery does NOT log in. It only lists available targets.

6: Login Target:

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.server.x8664:sn.89b50c23d34a 192.168.1.104 -l
• -m node → operate on a discovered node

• -T → specify which target to log in to

• 192.168.1.104 → target portal IP

• -l → login

📌 Result

• A session is created

• The kernel receives a new SCSI device

• You will see a new disk (e.g., ) Check with:

lsblk
OR
fdisk -l
OR
cat /proc/scsi/scsi
**TEST WITH **

mkdir -p /newdev

mkfs.ext4 /dev/sdb

mount /dev/sdb /newdev

cd /newdev

touch test{1..10}.txt

mkdir aa bb cc dd

ls -lh
To log out of the active session:
sudo iscsiadm -m node -T iqn.2026-01.sa.lab:storage.target01 -p 192.168.10.10 --logout
What this does: • Terminates the iSCSI session

• Removes the LUN from (e.g., disappears)

• Ensures the initiator is no longer connected to the target You can verify with:

sudo iscsiadm -m session
Remove the discovered target (delete node record)

Discovery creates a node record under /etc/iscsi/nodes/. .

If you want to remove it completely:

sudo iscsiadm -m node -T iqn.2026-01.sa.lab:storage.target01 -p 192.168.10.10 -o delete
What this does:

Deletes the saved configuration for that target
Removes auto‑login settings
Removes CHAP settings (if configured)
Removes the target from the initiator’s database After this, the initiator “forgets” the target.
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