After installing the Target Iscsci disk on the server A, we need to use it from Server B .
Please note :this installation was executed on my own test lap based on Vmware machines . Now we will explain how to add the target disk to our local server.
You can consult this line to see how we did the installation of target iSCSI server
How to Configure Storage Server with iSCSI in Redhat and Centos 7
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Info :
Target ISCSI Server  =  centos7a
The Actual Server    = centos7b
Before to start Please install  the iscsi initiator utils
yum -y install iscsi-initiator-utils
Enable and start Iscsid services
systemctl enable iscsid systemctl start iscsid
Show My disks
[root@centos7b ~]# fdisk -l Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x000bfc92 Device Boot Start End Blocks Id System /dev/sda1 * 2048 2099199 1048576 83 Linux /dev/sda2 2099200 41943039 19921920 8e Linux LVM Disk /dev/mapper/centos-root: 18.2 GB, 18249416704 bytes, 35643392 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
the Status on the Target Server :
We have to use the ACL rule to be able to login and use the disk on target server
Please add the ACL initiator name to /etc/iscsi/initiatorname.iscsi .
[root@centos7b ~]# vi /etc/iscsi/initiatorname.iscsi InitiatorName=iqn.2018-04.org.osradar.com.centos7.share
 Check if the Port is opened on Target Server
[root@centos7b ~]# telnet centos7a 3260 Trying 192.168.65.131... Connected to centos7a. Escape character is '^]'.
 Discover the target
[root@centos7b ~]# iscsiadm --mode discoverydb --type sendtargets --portal centos7a --discover 192.168.65.131:3260,1 iqn.2016-02.osradar.com [root@centos7b ~]#
Please remember the iqn name
 Login to the Target.
 We are logged in.. nice!
Show my disks  Now Â
 
 you can format the disk and use it for mount partition /data Â
fdisk /dev/sdb and create primary partition /dev/sdb1
[root@centos7b ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x087d615e.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (8192-8388607, default 8192):
Using default value 8192
Last sector, +sectors or +size{K,M,G} (8192-8388607, default 8388607):
Using default value 8388607
Partition 1 of type Linux and of size 4 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos7b ~]# new device has been created
Format the Disk and create ext4 disk
[root@centos7b ~]# mkfs.ext4 /dev/sdb1 mke2fs 1.42.9 (28-Dec-2013) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=1024 blocks 262144 inodes, 1047552 blocks 52377 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1073741824 32 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736 Allocating group tables: done Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done [root@centos7b ~]#
Create directory /data and mount the disk to this folder
[root@centos7b ~]# mkdir /data [root@centos7b ~]# mount /dev/sdb1 /data [root@centos7b ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 17G 5.5G 12G 33% / devtmpfs 477M 0 477M 0% /dev tmpfs 488M 0 488M 0% /dev/shm tmpfs 488M 6.8M 481M 2% /run tmpfs 488M 0 488M 0% /sys/fs/cgroup /dev/sda1 1014M 153M 862M 16% /boot 192.168.65.131:/nfs 17G 5.9G 12G 35% /nfsshare tmpfs 98M 0 98M 0% /run/user/0 /dev/sdb1 3.9G 16M 3.7G 1% /data [root@centos7b ~]#
To Mount this disk permanently please add this line to /etc/fstab
/dev/sdb1 /data ext4 _netdev,defaults 0 0
 Reboot your System and Check if the disk is mounted automatically.
Enjoy
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