准备工作：

主机 系统 地址 软件
target主机 CentOS 6.4 i386 192.168.0.22 iscsi-target-utils
initiator主机 CentOS 6.4 i386 192.168.0.23 iscsi-initiator-utils
initiator主机 CentOS 6.4 i386 192.168.0.24 iscsi-initiator-utils

一. 配置target主机

在target主机有两块硬盘，/dev/sda和/dev/sdb，其中sdb作为iSCSI的共享磁盘

1. 安装iSCSI的服务端

[root@target ~]# yum install scsi-target-utils

2. 将tgtd服务设置为开机启动，并将它启动

[root@target ~]# chkconfig tgtd on[root@target ~]# service tgtd startStarting SCSI target daemon:                               [  OK  ]

3. 关于tgtadm命令的简单介绍

[root@target ~]# tgtadm -hUsage: tgtadm [OPTION]Linux SCSI Target Framework Administration Utility, version 1.0.24  --lld 
     
       --mode target --op new --tid 
      
        --targetname 
       
                                add a new target with 
        
          and 
         
          . 
          
            must not be zero. --lld 
           
             --mode target --op delete [--force] --tid 
            
              delete the specific target with 
             
              . With force option, the specific target is deleted even if there is an activity. --lld 
              
                --mode target --op show show all the targets. --lld 
               
                 --mode target --op show --tid 
                
                  show the specific target's parameters. --lld 
                 
                   --mode target --op update --tid 
                  
                    --name 
                    --value 
                   
                     change the target parameters of the specific target with 
                    
                     . --lld 
                     
                       --mode target --op bind --tid 
                      
                        --initiator-address 
                       
 --lld 
                        
                          --mode target --op bind --tid 
                         
                           --initiator-name 
                          
                            enable the target to accept the specific initiators. --lld 
                           
                             --mode target --op unbind --tid 
                            
                              --initiator-address 
                             
 --lld 
                              
                                --mode target --op unbind --tid 
                               
                                 --initiator-name 
                                
                                  disable the specific permitted initiators. --lld 
                                 
                                   --mode logicalunit --op new --tid 
                                  
                                    --lun 
                                   
                                     \ --backing-store 
                                    
                                      --bstype 
                                     
                                       --bsoflags 
                                      
                                        add a new logical unit with 
                                       
                                         to the specific target with 
                                        
                                         . The logical unit is offered to the initiators. 
                                         
                                           must be block device files (including LVM and RAID devices) or regular files. bstype option is optional. bsoflags supported options are sync and direct (sync:direct for both). --lld 
                                          
                                            --mode logicalunit --op delete --tid 
                                           
                                             --lun 
                                            
                                              delete the specific logical unit with 
                                             
                                               that the target with 
                                              
                                                has. --lld 
                                               
                                                 --mode account --op new --user 
                                                
                                                  --password 
                                                 
                                                   add a new account with 
                                                  
                                                    and 
                                                   
                                                    . --lld 
                                                    
                                                      --mode account --op delete --user 
                                                     
                                                       delete the specific account having 
                                                      
                                                       . --lld 
                                                       
                                                         --mode account --op bind --tid 
                                                        
                                                          --user 
                                                         
                                                           [--outgoing] add the specific account having 
                                                          
                                                            to the specific target with 
                                                           
                                                            . 
                                                            
                                                              could be 
                                                             
                                                               or 
                                                              
                                                               . If you use --outgoing option, the account will be added as an outgoing account. --lld 
                                                               
                                                                 --mode account --op unbind --tid 
                                                                
                                                                  --user 
                                                                 
                                                                   delete the specific account having 
                                                                  
                                                                    from specific target. --control-port 
                                                                   
                                                                     use control port 
                                                                    
                                                                      --help display this help and exitReport bugs to 
                                                                     
                                                                      .

首先，创建一个target

[root@target ~]# tgtadm -L iscsi -m target -o new -t 1 -T iqn.2014-03.com.flyence:target1

查看该target的相关情况

[root@target ~]# tgtadm -L iscsi -m target -o show

创建一个LU，并将/dev/sdb作为共享磁盘

[root@target ~]# tgtadm -L iscsi -m logicalunit -o new -t 1 -l 1 -b /dev/sdb

允许192.168.0.0/16网段的主机访问

[root@target ~]# tgtadm -L iscsi -m target -o bind  -t 1 -I 192.168.0.0/24

创建认证账号，并绑定到target上

[root@target ~]# tgtadm -L iscsi -m account -o new --user flyence --password flyence[root@target ~]# tgtadm -L iscsi -m account -o bind -t 1 --user flyence

该账号作为客户机访问服务端的认证账号

创建认证账号，并以outgoing的形式绑定到target上

[root@target ~]# tgtadm -L iscsi -m account -o new --user evan --password evan[root@target ~]# tgtadm -L iscsi -m account -o bind -t 1 --user evan --outgoing

当客户机向服务端写入前，客户机会用此账号验证服务器的身份。

二. 配置客户端

1. 安装iscsi-initiator-utils

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

2. 设置initiator的名字

[root@initiator iscsi]# echo "InitiatorName=`iscsi-iname -p iqn.2014-03.com.flyence`" > /etc/iscsi/initiatorname.iscsi[root@initiator iscsi]# cat initiatorname.iscsiInitiatorName=iqn.2014-03.com.flyence:9e9d0941d1f

3. 在/etc/iscsi/iscsi.conf中配置验证账号信息，启用以下5行，并修改

node.session.auth.authmethod = CHAP                                                                                                                                                                                                                                                                                                                               node.session.auth.username = flyencenode.session.auth.password = flyence                                                                                                                                                                                                                                                                                                                                                     node.session.auth.username_in = evannode.session.auth.password_in = evan

4. 发现服务器的target

[root@initiator iscsi]# iscsiadm -m discovery -t st -p 192.168.0.22:3260Starting iscsid:                                           [  OK  ]192.168.0.22:3260,1 iqn.2014-03.com.flyence:target1

5. 登录上述被发现的target

[root@initiator iscsi]# iscsiadm  -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -lLogging in to [iface: default, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] (multiple)Login to [iface: default, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] successful.

6. 查看当前的磁盘情况

[root@initiator iscsi]# fdisk -l /dev/sd[a-z]Disk /dev/sda: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000925b4   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          26      204800   83  LinuxPartition 1 does not end on cylinder boundary./dev/sda2              26        7675    61440000   8e  Linux LVM/dev/sda3            7675       14049    51200000   8e  Linux LVM/dev/sda4           14049       15666    12983296    5  Extended/dev/sda5           14049       15666    12982272   8e  Linux LVMDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

多出一块硬盘/dev/sdb，并且sdb还没分区，

7. 将sdb分两个区，并将sdb1格式化为ext4

[root@initiator iscsi]# fdisk /dev/sdb....[root@initiator iscsi]# fdisk -l /dev/sdbDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc9458e42   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1        1306    10490413+  83  Linux/dev/sdb2            1307        2612    10490445   83  Linux[root@initiator iscsi]# mkfs.ext4 /dev/sdb1

8. 此时，查看target主机的sdb硬盘情况

[root@target ~]# fdisk -l /dev/sdbDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc9458e42   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1        1306    10490413+  83  Linux/dev/sdb2            1307        2612    10490445   83  Linux

已被分好区

当要开机启动服务时

[root@initiator iscsi]# chkconfig iscsid on

三. 服务端target配置文件的设定

在服务端如果只是在命令行中定义target和LU，在重启时会消失，要使其永久有效，就得写入配置文件/etc/tgt/targets.conf

     
          backing-store /dev/sdb    initiator-address 192.168.0.0/16                                                                                                                                                       incominguser flyence flyence    outgoinguser evan evan

重启服务器主机，再看看target的配置

[root@target ~]# tgtadm -L iscsi -m target -o showTarget 1: iqn.2014-03.com.flyence:target2    System information:        Driver: iscsi        State: ready    I_T nexus information:        I_T nexus: 1            Initiator: iqn.2014-03.com.flyence:9e9d0941d1f            Connection: 0                IP Address: 192.168.0.23    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: 128849 MB, Block size: 512            Online: Yes            Removable media: No            Prevent removal: No            Readonly: No            Backing store type: rdwr            Backing store path: /dev/sdb            Backing store flags:    Account information:        flyence        evan (outgoing)    ACL information:        192.168.0.0/16

此时，由于已修改了target的名字，则客户机无法直接登录，只能删除原有信息，重新发现和登录

在客户机上，先登出原有的target

[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -uLogging out of session [sid: 1, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260]Logout of [sid: 1, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] successful.

删除该target及相关文件

[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -o delete[root@initiator iscsi]# rm -rf /var/lib/iscsi/send_targets/192.168.0.22,3260/

重启服务

[root@initiator iscsi]# service iscsid restartStopping iscsid:Starting iscsid:                                           [  OK  ]

重新发现和登录

[root@initiator iscsi]# iscsiadm -m discovery -t st -p 192.168.0.22:3260192.168.0.22:3260,1 iqn.2014-03.com.flyence:target2[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target2 -p 192.168.0.22:3260 -lLogging in to [iface: default, target: iqn.2014-03.com.flyence:target2, portal: 192.168.0.22,3260] (multiple)Login to [iface: default, target: iqn.2014-03.com.flyence:target2, portal: 192.168.0.22,3260] successful.

查看磁盘

[root@initiator iscsi]# fdisk -l /dev/sdbDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc9458e42   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1        1306    10490413+  83  Linux/dev/sdb2            1307        2612    10490445   83  Linux