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   ] |10.0.0.30 | 10.0.0.31| [ 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 ]

# provided devicce as a iSCSI target

backing-store /var/lib/iscsi_disks/disk01.img

# iSCSI Initiator's IP address you allow to connect

initiator-address 10.0.0.31

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

incominguser username password
</target>

[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:
        username
    ACL information:
        10.0.0.31

Matched Content