CentOS 6
Configure iSCSI Target
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

[] - iSCSI Initiator
This example configures to create LVM partition on iSCSI Target, so it need to have enough areas to use. If your iSCSI Target does not have enough areas, add new hard drive.
[1] Configure iSCSI Target
# create a phisical volume

[root@dlp ~]#
pvcreate /dev/sdb1

  Physical volume "/dev/sdb1" successfully created
# create a volume group named "vg_target00"

[root@dlp ~]#
vgcreate -s 32M vg_target00 /dev/sdb1

  Volume group "vg_target00" successfully created
# create a logical volume named "lv_target00"

[root@dlp ~]#
lvcreate -L 100G -n lv_target00 vg_target00

  Logical volume "lv_target00" created
[root@dlp ~]#
yum -y install scsi-target-utils
[root@dlp ~]#
vi /etc/tgt/targets.conf
# add at the last

# if you set some devices, add <target>-</target> and set the same way with follows

# naming rule : [ iqn.yaer-month.domain:any name ]

<target iqn.2011-07.world.server:target0>
# provided devicce as a iSCSI target

    backing-store /dev/vg_target00/lv_target00
# iSCSI Initiator's IP address you allow to connect

# authentication info ( set anyone you like for "username", "password" )

    incominguser username password
[root@dlp ~]#
/etc/rc.d/init.d/tgtd start

Starting SCSI target daemon:
[ OK ]

[root@dlp ~]#
chkconfig tgtd on

[root@dlp ~]#
tgtadm --mode target --op show
# confirm status

Target 1: iqn.2011-07.world.server:target0
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: None
    Account information:
    ACL information:
Complete to configure iSCSI Target. See next step to configure iSCSI Initiatori.