Do a simple iSCSI example

# Install iSCSI target
yum install scsi-target-utils
chkconfig tgtd on
service tgtd start

# Now you using the following command you see a new disk sdX
fdisk -l

# Edit File : /etc/tgt/targets.conf

default-driver iscsi
<target iqn.2013-03.com.example:server.target1>
    backing-store /dev/sde1
write-cache off
</target>

service tgtd restart
tgt-admin –show
And you will see the following:

Target 1: iqn.2013-03.com.example:server.target1
    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:
    Account information:
    ACL information:
        ALL

# Initiator
yum install -y iscsi-initiator-utils

# Do a discovery 
iscsiadm -m discovery -t sendtargets -p 192.168.50.21

# connect to the remote disk
iscsiadm -m node -T iqn.2013-03.com.example:server.target1 -p 192.168.50.21 --login
and you will see the following


[root@localhost ~]# iscsiadm -m node -T iqn.2013-03.com.example:server.target1 -p 192.168.50.21
# BEGIN RECORD 2.0-872.41.el6
node.name = iqn.2013-03.com.example:server.target1
node.tpgt = 1
node.startup = automatic
node.leading_login = No
iface.hwaddress = <empty>
iface.ipaddress = <empty>
iface.iscsi_ifacename = default
iface.net_ifacename = <empty>
iface.transport_name = tcp
iface.initiatorname = <empty>
iface.bootproto = <empty>
iface.subnet_mask = <empty>
iface.gateway = <empty>
iface.ipv6_autocfg = <empty>
iface.linklocal_autocfg = <empty>
iface.router_autocfg = <empty>
iface.ipv6_linklocal = <empty>
iface.ipv6_router = <empty>
iface.state = <empty>
iface.vlan_id = 0
iface.vlan_priority = 0
iface.vlan_state = <empty>
iface.iface_num = 0
iface.mtu = 0
iface.port = 0
node.discovery_address = 192.168.50.21
node.discovery_port = 3260
node.discovery_type = send_targets
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 8
node.session.xmit_thread_priority = -20
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.nr_sessions = 1
node.session.auth.authmethod = None
node.session.auth.username = <empty>
node.session.auth.password = <empty>
node.session.auth.username_in = <empty>
node.session.auth.password_in = <empty>
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 30
node.session.err_timeo.tgt_reset_timeout = 30
node.session.err_timeo.host_reset_timeout = 60
node.session.iscsi.FastAbort = Yes
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.DefaultTime2Wait = 2
node.session.iscsi.MaxConnections = 1
node.session.iscsi.MaxOutstandingR2T = 1
node.session.iscsi.ERL = 0
node.conn[0].address = 192.168.50.21
node.conn[0].port = 3260
node.conn[0].startup = manual
node.conn[0].tcp.window_size = 524288
node.conn[0].tcp.type_of_service = 0
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.auth_timeout = 45
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.conn[0].iscsi.MaxXmitDataSegmentLength = 0
node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144
node.conn[0].iscsi.HeaderDigest = None
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD


[root@localhost ~]# iscsiadm -m node -T iqn.2013-03.com.example:server.target1 -p 192.168.50.21 --login
Logging in to [iface: default, target: iqn.2013-03.com.example:server.target1, portal: 192.168.50.21,3260] (multiple)
Login to [iface: default, target: iqn.2013-03.com.example:server.target1, portal: 192.168.50.21,3260] successful.

# Mount it 

mkfs.ext3 /dev/sdd1 mkdir iSCSI mount /dev/sdd1 /iSCSI

blkid /dev/sdd1 echo “UUID=9674832d-c995-4ac8-b6da-0d25efa088d0 /iSCSI ext3 _netdev 0 0” » /etc/fstab