服务端：
首先拿出一块分区/dev/sda5

# yum search target
# yum install scsi-target-utils.x86_64 -y　　 //服务端的包
# vim /etc/tgt/targets.conf  　　//编辑服务端的配置

<target redhat:1> //共享出这块分区的名字为redhat:1
    backing-store /dev/sda5
</target>

/etc/init.d/tgtd restart 　　//重启服务

客户端的安装：
# yum search iscsi　　查找到iscsi软件包并安装

[root@redhat conf.d]# iscsiadm -m discovery -t st -p 192.168.3.60 //首先发现服务端的这块分区
Starting iscsid:                                           [  OK  ]
192.168.3.60:3260,1 redhat:1
[root@redhat conf.d]#

[root@redhat conf.d]# iscsiadm -m node -T redhat:1 -p 192.168.3.60 -l   //使用进入这块分区
Logging in to [iface: default, target: redhat:1, portal: 192.168.3.60,3260] (multiple)
Login to [iface: default, target: redhat:1, portal: 192.168.3.60,3260] successful.

Disk /dev/sda: 209 MB, 209715200 bytes
# fdisk -cu /dev/sda

[root@redhat conf.d]# partx -d /dev/sda
error deleting partitions 2-256: BLKPG: No such device or address
[root@redhat conf.d]# partx -a /dev/sda

# mkfs.ext4 /dev/sda1
[root@redhat conf.d]# mount /dev/sda1 /mnt/
[root@redhat conf.d]# df
Filesystem                   1K-blocks    Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root   6926264 1557096   5017324  24% /
tmpfs                           244988       0    244988   0% /dev/shm
/dev/vda1                       495844   33487    436757   8% /boot
/dev/sda1                       197338    5646    181504   4% /mnt
# umount /mnt/

# iscsiadm -m node -T redhat:1 -p 192.168.3.60 -u

# fdisk -l //sda1　　是没有了
# /etc/init.d/iscsi restart
# fdisk -l 　　//重启后发现又恢复出来了
Disk /dev/sda: 209 MB, 209715200 bytes
# iscsiadm -m node -T redhat:1 -p 192.168.3.60 -u
# iscsiadm -m node -T redhat:1 -p 192.168.3.60 -o delete

# /etc/init.d/iscsi restart
# fdisk -l
没有了不会再恢复出来