思路：全部用vmware workstation 来模拟，
共享存储服务器share_server和访问客户端client1,client2都是RHEL 6.3
share_server上增加一个独立的硬盘，并分区/dev/sdb1,作为共享存储用。
配置存储服务器端 (iSCSI Target),安装scsi-target-utils相关软件包,创建要输出的存储Target(启动tgt服务，创建target,划分lun)
target端步骤：
1.在share_server虚拟机上增加磁盘，不要在fstab中指定mount点。
2. 安装target端软件
yum install scsi-target-utils -y
3.启动tgtd
service tgtd start
4.设置tgtd服务开机启动
chkconfig tgdtd on
5.定义一个target 设置iqn和tid
tgtadm --lld iscsi --op new --mode target --tid 1 --targetname iqn.-.test.www:target1
6.检查
tgtadm --lld iscsi --op show --mode target
7.分配LUN
tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 --backing-store /dev/sdb1
8.保存配置，下次开机自动就有了LUN和target
vi tgt/targets.conf (注意ALL要大写，不限制访问地址)
<target iqn.-.test.www:target1>backing-store /dev/sdb1initiator-address ALL</target>
9. 查看LUN
tgtadm --lld iscsi --op show --mode target
client端步骤
1.yum install iscsi-initiator-utils -y
2.service iscsi start （/etc/init.d/iscsistart，
3.chkconfig iscsi on
4.service iscsi status
5。
侦测target$iscsiadm-mdiscovery-tsendtargets-p10.0.100.9910.0.100.99:3260,1iqn.-.test:server.target1$ll-R/var/lib/iscsi/nodes/
6.
査看可用的target$iscsiadm-mnode
7、
载入target$iscsiadm-mnode-Tiqn.-.test:server.target1--login
8. fdisk -l
在vmware workstation虚拟机中增加磁盘。两种方法，方法1要重启，方法2不重启。
1.Adding a new disk to a VMWare Virtual Machine in Linux
参见：//05/adding-a-new-disk-to-a-vmware-virtual-machine-in-linux/
2.http://www.cyberciti.biz/tips/vmware-add-a-new-hard-disk-without-rebooting-guest.html
要用到的工具：
1.分区软件fdisk
2.查看文件系统类型，使用blkid命令加上设备名就可以获取该设备的所有信息：
[root@rhel_ha ~]# blkid
/dev/sda3: UUID="5f759db8-ef80-4851-a4ba-227899f3d0c8" TYPE="ext4"/dev/sda1: UUID="a3d2aaab-9ab4-4c75-9819-883e06bdcbba" TYPE="ext4"/dev/sda2: UUID="5574e3a6-bd33-4404-87cd-6334d211e538" TYPE="swap"
3.格式化分区
[root@rhel_ha ~]# mkfs -V -t ext4 /dev/sdb1mkfs (util-linux-ng 2.17.2)mkfs.ext4 /dev/sdb1mke2fs 1.41.12 (17-May-)Filesystem label=OS type: LinuxBlock size=4096 (log=2)Fragment size=4096 (log=2)Stride=0 blocks, Stripe width=0 blocks1310720 inodes, 5241198 blocks262059 blocks (5.00%) reserved for the super userFirst data block=0Maximum filesystem blocks=4294967296160 block groups32768 blocks per group, 32768 fragments per group8192 inodes per groupSuperblock backups stored on blocks:32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,4096000Writing inode tables: done Creating journal (32768 blocks): doneWriting superblocks and filesystem accounting information: doneThis filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
4.tune2fs
(调整/查看ext2/ext3文件系统的文件系统参数，Windows下面如果出现意外断电死机情况，下次开机一般都会出现系统自检。Linux系统下面也有文件系统自检，而且是可以通过tune2fs命令，自行定义自检周期及方式。)
[root@rhel_ha ~]# tune2fs -l /dev/sdb1tune2fs 1.41.12 (17-May-)Filesystem volume name: <none>Last mounted on:<not available>Filesystem UUID:0973912f-ea9f-412e-ab82-f472d9f5d888Filesystem magic number: 0xEF53Filesystem revision #: 1 (dynamic)Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isizeFilesystem flags:signed_directory_hashDefault mount options: (none)Filesystem state:cleanErrors behavior:ContinueFilesystem OS type: LinuxInode count: 1310720Block count: 5241198Reserved block count: 262059Free blocks: 5114909Free inodes: 1310709First block: 0Block size: 4096Fragment size:4096Reserved GDT blocks: 1022Blocks per group:32768Fragments per group: 32768Inodes per group:8192Inode blocks per group: 512Flex block group size: 16Filesystem created: Wed Nov 14 18:58:49 Last mount time:n/aLast write time:Wed Nov 14 18:59:02 Mount count: 0Maximum mount count: 33Last checked: Wed Nov 14 18:58:49 Check interval:15552000 (6 months)Next check after:Mon May 13 19:58:49 Lifetime writes:452 MBReserved blocks uid: 0 (user root)Reserved blocks gid: 0 (group root)First inode: 11Inode size: 256Required extra isize: 28Desired extra isize: 28Journal inode:8Default directory hash: half_md4Directory Hash Seed: 30bcae6f-2257-4d70-8e82-8467f057bf36
Journal backup:inode blocks
5.iSCSI节点名称有两种格式，即 iqn-type 格式和 eui-type 格式。
iqn-type的格式为:
iqn.yyyy-mm.backward_naming_authority:unique_device_name
在Linux上的格式为:
iqn.1987-.cisco:RandomNumber
通常我们可以把RandomNumber更改为具有意义的名称如主机名称等。
缺省的，生成的节点名称可以在/etc/initiatorname.iscsi 得到.
InitiatorName=iqn.1987-.cisco:01.ed671bf29e
我们可以修改为:
InitiatorName=iqn.1987-.cisco:test2
