server：192.168.0.91（scsi服务器）
client: 192.168.0.191
Server端将本地的一个分区（最好是格式化好的，但不要挂载）、lvm、整个硬盘共享出去
Client端将server共享出来的设备导入到本地，进行正常的分区、格式化、挂载，就像使用本地端硬盘一样
Server配置(192.168.0.91)
1.安装rpm包
yum -y install scsi*
查看具体的rpm包端包名
[root@desktop91 ~]# rpm -qa | grep scsi
lsscsi-0.23-2.el6.x86_64
iscsi-initiator-utils-6.2.0.873-2.el6.x86_64
scsi-target-utils-1.0.24-2.el6.x86_64
根据具体的包名，查看安装出来的命令和配置文件
[root@desktop91 ~]# rpm -ql scsi-target-utils
/etc/rc.d/init.d/tgtd
/etc/sysconfig/tgtd
/etc/tgt/targets.conf
/usr/sbin/tgt-admin
/usr/sbin/tgt-setup-lun
/usr/sbin/tgtadm
/usr/sbin/tgtd
/usr/sbin/tgtimg
/usr/share/doc/scsi-target-utils-1.0.24
/usr/share/doc/scsi-target-utils-1.0.24/README
/usr/share/doc/scsi-target-utils-1.0.24/README.iscsi
/usr/share/doc/scsi-target-utils-1.0.24/README.iser
/usr/share/doc/scsi-target-utils-1.0.24/README.lu_configuration
/usr/share/doc/scsi-target-utils-1.0.24/README.mmc
/usr/share/man/man5/targets.conf.5.gz
/usr/share/man/man8/tgt-admin.8.gz
/usr/share/man/man8/tgt-setup-lun.8.gz
/usr/share/man/man8/tgtadm.8.gz
2.修改主配置文件
[root@desktop91 ~]# vim /etc/tgt/targets.conf
38 #
找到该文件的38行（大概），复制该3行的内容进行修改
38 #
注意：如果此处设备的配置项用的是整个硬盘的配置项，会报以下错误
[root@desktop91 ~]# bash /etc/init.d/tgtd start
Starting SCSI target daemon: [ OK ]
Both SCSI INQUIRY and fetching ATA information failed on /dev/sda6
inquiry: pass through os error: Inappropriate ioctl for device
inquiry: failed, res=-1
READ CAPACITY (16) failed [res=-1], try with '-v'
3.启动服务
注意：该服务启动脚本中用shell是sh，所以在启动该服务时一定要用bash，否则会报错
[root@desktop91 ~]# /etc/init.d/tgtd start
Starting SCSI target daemon: [FAILED]
[root@desktop91 ~]# bash /etc/init.d/tgtd start
Starting SCSI target daemon: [ OK ]
Client配置(192.168.0.191)
1.安装rpm包
[root@server91 ~]# yum -y install iscsi*
找到具体端rpm包端包名
[root@server91 ~]# rpm -qa | grep iscsi
iscsi-initiator-utils-6.2.0.872-41.el6.x86_64
iscsi-initiator-utils-devel-6.2.0.872-41.el6.x86_64
根据具体的包名，查看安装出来的命令和配置文件
[root@server91 ~]# rpm -ql iscsi-initiator
package iscsi-initiator is not installed
[root@server91 ~]# rpm -ql iscsi-initiator-utils
/etc/NetworkManager
/etc/NetworkManager/dispatcher.d
/etc/NetworkManager/dispatcher.d/04-iscsi
/etc/iscsi
/etc/iscsi/iscsid.conf
/etc/logrotate.d/iscsiuiolog
/etc/rc.d/init.d/iscsi
/etc/rc.d/init.d/iscsid
/sbin/brcm_iscsiuio
/sbin/iscsi-iname
/sbin/iscsiadm
/sbin/iscsid
/sbin/iscsistart
/sbin/iscsiuio
/usr/lib64/libiscsi.so.0
/usr/lib64/python2.6/site-packages/libiscsimodule.so
/usr/share/doc/iscsi-initiator-utils-6.2.0.872
/usr/share/doc/iscsi-initiator-utils-6.2.0.872/README
/usr/share/man/man8/iscsi-iname.8.gz
/usr/share/man/man8/iscsiadm.8.gz
/usr/share/man/man8/iscsid.8.gz
/usr/share/man/man8/iscsistart.8.gz
/usr/share/man/man8/iscsiuio.8.gz
/var/lib/iscsi
/var/lib/iscsi/ifaces
/var/lib/iscsi/isns
/var/lib/iscsi/nodes
/var/lib/iscsi/send_targets
/var/lib/iscsi/slp
/var/lib/iscsi/static
/var/lock/iscsi
2.在client的配置文件中输入用验证端用户名和密码
[root@server91 ~]# vi /etc/iscsi/iscsid.conf
53 node.session.auth.authmethod = CHAP //打开此处要认证的方式
54
55 # To set a CHAP username and password for initiator
56 # authentication by the target(s), uncomment the following lines:
57 node.session.auth.username = user //要认证端用户名
58 node.session.auth.password = uplooking //要认证端密码
59
60 # To set a CHAP username and password for target(s)
61 # authentication by the initiator, uncomment the following lines:
62 #node.session.auth.username_in = username_in
63 #node.session.auth.password_in = password_in
64
65 # To enable CHAP authentication for a discovery session to the target
66 # set discovery.sendtargets.auth.authmethod to CHAP. The default is None.
67 #discovery.sendtargets.auth.authmethod = CHAP
68
69 # To set a discovery session CHAP username and password for the initiator
70 # authentication by the target(s), uncomment the following lines:
71 discovery.sendtargets.auth.username = user //发现需要认证的用户名
72 discovery.sendtargets.auth.password = uplooking //发现需要认证端密码
3.发现设备
[root@server91 ~]# iscsiadm -m discovery -t st -p 192.168.0.91
Starting iscsid: [ OK ]
192.168.0.91:3260,1 iqn.2013-10.com.example:redhat.target3
4.导入设备
[root@server91 ~]# iscsiadm -m node -T iqn.2013-10.com.example:redhat.target3 -p 192.168.0.91 -l
Logging in to [iface: default, target: iqn.2013-10.com.example:redhat.target3, portal: 192.168.0.91,3260] (multiple)
Login to [iface: default, target: iqn.2013-10.com.example:redhat.target3, portal: 192.168.0.91,3260] successful.
5.进行正常的分区、格式化、挂载、正常的使用
[root@server91 ~]# fdisk /dev/sda
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x10907c53.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): p
Disk /dev/sda: 10.7 GB, 10742183424 bytes
64 heads, 32 sectors/track, 10244 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x10907c53
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-10244, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-10244, default 10244):
Using default value 10244
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@server91 ~]# ls /dev/sda
sda sda1
[root@server91 ~]# mkfs.ext4 /dev/sda1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
655776 inodes, 2622460 blocks
131123 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2688548864
81 block groups
32768 blocks per group, 32768 fragments per group
8096 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@server91 ~]# mount /dev/sda1 /mnt
[root@server91 ~]#
[root@server91 ~]#
[root@server91 ~]# cd /mnt/
[root@server91 mnt]#
[root@server91 mnt]#
[root@server91 mnt]# ls
lost+found
[root@server91 mnt]# echo 1234 > file1
[root@server91 ~]# ls -ld /mnt/file1
-rw-r--r--. 1 root root 5 Oct 20 04:24 /mnt/file1