CentOS 6
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Configure iSCSI Target2014/08/05

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  ] |
|     dlp.srv.world    +----------+----------+     www.srv.world    |
|                      |                     |                      |
+----------------------+                     +----------------------+

[1] Install administration tools.
[root@dlp ~]#
yum -y install scsi-target-utils
[2] Configure iSCSI Target .
For example, create a disk image under the [/var/lib/iscsi_disks] directory and set it as a shared disk.
# create a disk image

[root@dlp ~]#
mkdir /var/lib/iscsi_disks

[root@dlp ~]#
dd if=/dev/zero of=/var/lib/iscsi_disks/disk01.img count=0 bs=1 seek=20G
[root@dlp ~]#
vi /etc/tgt/targets.conf
# add follows to the end

# 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.2014-08.world.srv:target00>
# provided devicce as a iSCSI target

    backing-store /var/lib/iscsi_disks/disk01.img
# iSCSI Initiator's IP address you allow to connect

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

    incominguser username password
[3] If SELinux is enabled, change SELinux Context like follows.
[root@dlp ~]#
chcon -R -t tgtd_var_lib_t /var/lib/iscsi_disks

[root@dlp ~]#
semanage fcontext -a -t tgtd_var_lib_t /var/lib/iscsi_disks

[4] If IPTables is running, allow iSCSI target port.
For "-I INPUT 5" section below example, Replace it to your own environment.
[root@dlp ~]#
iptables -I INPUT 5 -p tcp -m state --state NEW -m tcp --dport 3260 -j ACCEPT

[5] Start tgtd and verify status.
[root@dlp ~]#
/etc/rc.d/init.d/tgtd start

Starting SCSI target daemon:                   [  OK  ]
[root@dlp ~]#
chkconfig tgtd on

# verufy status

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

Target 1: iqn.2014-08.world.srv:target00
    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, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags:
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 21475 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /var/lib/iscsi_disks/disk01.img
            Backing store flags:
    Account information:
    ACL information:
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