实验目的：构建SAN网络存储
实验环境：redhat 5.4三台，scanstorage作为存储服务，IP地址是：192.168.9.79。node1,node2作为客户端测试
实验步骤：
一、配置服务端：
1、添加一块20G的盘
[root@scanstorage ~]# fdisk -l |grep Disk
Disk /dev/sdc: 21.4 GB, 21474836480 bytes
2、在RHEL5中安装如下的包：
iscsi-initiator-utils-6.2.0.868-0.18.el5.i386.rpm
perl-Config-General-2.40-1.el5.noarch.rpm
scsi-target-utils-0.0-5.20080917snap.el5.i386.rpm (这个包在光盘的cluster storage目录下）
[root@scanstorage ~]# yum -y install iscsi-initiator-utils perl-Config-General scsi-target-utils
3、通过linux中的命令生成IQN编号
[root@scanstorage ~]# iscsi-iname
iqn.1994-05.com.redhat:a3c8bc769291
4、编辑配置文件
[root@scanstorage ~]# vim /etc/tgt/targets.conf

backing-store /dev/sdb

5、启动服务
[root@scanstorage ~]# /etc/init.d/tgtd start
Starting SCSI target daemon: Starting target framework daemon
6、查看配置信息

[root@scanstorage ~]# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.1994-05.com.redhat:bc2c8763fcdb
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
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 21475 MB
Online: Yes
Removable media: No
Backing store type: rdwr
Backing store path: /dev/sdb
Account information:
ACL information:
ALL
[root@scanstorage ~]#

以上就是ISCSI服务的配置，注意，ISCSI的链接端口是3260，保证防火墙正常通过。接下来我们配置客户端。
二、配置客户端
客户端的配置的时候只需要安装一个ISCSI Initiator的包即可。以node1，node2为例：
1、安装包
[root@node1 ~]# yum -y install iscsi-initiator-utils

[root@node2 ~]# yum -y install iscsi-initiator-utils

2、使用iSCSI存储
[root@node1 ~]# iscsiadm -m discovery -t st -p 192.168.9.79
192.168.9.79:3260,1 iqn.1994-05.com.redhat:bc2c8763fcdb

[root@node2 ~]# iscsiadm -m discovery -t st -p 192.168.9.79
192.168.9.79:3260,1 iqn.1994-05.com.redhat:bc2c8763fcdb

在node1和node2上开启服务如下服务：iscsid network iscsi netfs，然后登录：

[root@node1 ~]# iscsiadm -m node -T iqn.1994-05.com.redhat:bc2c8763fcdb -p 192.168.9.79 -l
[root@node1 ~]# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 3393 27254241 83 Linux
/dev/sda2 3394 3915 4192965 82 Linux swap / Solaris

Disk /dev/sdb: 21.4 GB, 21474836480 bytes64 heads, 32 sectors/track, 20480 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sdb doesn't contain a valid partition table

[root@node1 ~]# iscsiadm -m node -T iqn.1994-05.com.redhat:bc2c8763fcdb -p 192.168.9.79 -l
[root@node2 ~]# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 3393 27254241 83 Linux
/dev/sda2 3394 3915 4192965 82 Linux swap / Solaris

Disk /dev/sdb: 21.4 GB, 21474836480 bytes64 heads, 32 sectors/track, 20480 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk /dev/sdb doesn't contain a valid partition table

注：此文曾在向上交流群网站上发表过，参见链接地址如下：
http://www.eeqee.com/jforum/posts/list/2724.page

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