Configure Storage Server with iSCSI

Configure Storage Server with iSCSI. A storage on a network is called iSCSI Target, a Client which connects to iSCSI Target is called iSCSI Initiator.  This example is based on the environment below. +----------------------+ | +----------------------+ | [ iSCSI Target ] |10.0.0.30 | 10.0.0.31| [ iSCSI Initiator ] | | dlp.server.world +----------+----------+ www.server.world | | | | | +----------------------+ +----------------------+

[1]	Install administration tools first.

[root@dlp ~]#  yum -y install targetcli

[2]	Configure iSCSI Target. For example, create an disk-image under the /iscsi_disks directory and set it as a SCSI device.

# create a directory [root@dlp ~]#  mkdir /iscsi_disks  # enter the admin console [root@dlp ~]#  targetcli  targetcli shell version 2.1.fb34 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. />  cd backstores/fileio # create a disk-image with the name "disk01" on /iscsi_disks/disk01.img with 10G /backstores/fileio>  create disk01 /iscsi_disks/disk01.img 10G  Created fileio disk01 with size 10737418240 /backstores/fileio>  cd /iscsi # create a target /iscsi>  create iqn.2014-07.world.server:storage.target00  Created target iqn.2014-07.world.server:storage.target00. Created TPG 1. Global pref auto_add_default_portal=true Created default portal listening on all IPs (0.0.0.0), port 3260. /iscsi>  cd iqn.2014-07.world.server:storage.target00/tpg1/luns # set LUN /iscsi/iqn.20...t00/tpg1/luns>  create /backstores/fileio/disk01  Created LUN 0. /iscsi/iqn.20...t00/tpg1/luns>  cd ../acls # set ACL (it's the IQN of an initiator you permit to connect) /iscsi/iqn.20...t00/tpg1/acls>  create iqn.2014-07.world.server:www.server.world  Created Node ACL for iqn.2014-07.world.server:www.server.world Created mapped LUN 0. /iscsi/iqn.20...t00/tpg1/acls>  cd iqn.2014-07.world.server:www.server.world # set UserID for authentication /iscsi/iqn.20....server.world>  set auth userid=username  Parameter userid is now 'username'. /iscsi/iqn.20....server.world>  set auth password=password  Parameter password is now 'password'. /iscsi/iqn.20....server.world>  exit  Global pref auto_save_on_exit=true Last 10 configs saved in /etc/target/backup. Configuration saved to /etc/target/saveconfig.json [root@dlp ~]#  systemctl enable target # after configuration above, the target enters in listening like follows. [root@dlp ~]#  ss -napt | grep 3260  LISTEN 0 256 *:3260 *:*

[3]	If Firewalld is running, allow iSCSI Target service.

[root@dlp ~]#  firewall-cmd --add-service=iscsi-target --permanent  success [root@dlp ~]#  firewall-cmd --reload  success