rh436 - iscsi服务端配置(rhel5.5)

iscsi服务端配置

操作系统版本：

[root@ex333server ~]# lsb_release -a
LSB Version:    :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID:    RedHatEnterpriseServer
Description:    Red Hat Enterprise Linux Server release 5.5 (Tikanga)
Release:    5.5

创建如下两个用来共享的逻辑卷：
[root@ex333server ~]# lvs
  /dev/cdrom: open failed: No medium found
  LV            VG       Attr   LSize Origin Snap%  Move Log Copy%  Convert
  lv_iscsi_244  vg_iscsi -wi-a- 4.00M                                      
  lv_iscsi_demo vg_iscsi -wi-a- 4.00M          


安装软件包：
yum install scsi-target-utils

启动服务：
/etc/init.d/tgtd restart
chkconfig tgtd on


1. 通过命令配置iscsi服务端：
创建一个target：
tgtadm --lld iscsi --op new --mode target --tid=1 --targetname iqn.2012-05.com.example.ex333server:rdisks.demo

绑定共享设备到target：
tgtadm --lld iscsi --op new --mode=logicalunit --tid=1 --lun=1 --backing-store /dev/vg_iscsi/lv_iscsi_demo

设置可以访问共享的网段：
tgtadm --lld iscsi --op bind --mode=target --tid=1 --initiator-address=192.168.221.0/24

本地查看共享设备：
tgtadm --lld iscsi --op show --mode target

检查结果：
[root@ex333server init.d]# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2012-05.com.example.ex333server:rdisks.demo
    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: 4 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: /dev/vg_iscsi/lv_iscsi_demo
    Account information:
    ACL information:
        192.168.221.0/24
[root@ex333server init.d]# service tgtd restart
Stopping SCSI target daemon: Stopping target framework daemon
                                                           [  OK  ]
Starting SCSI target daemon: Starting target framework daemon

[root@ex333server init.d]# tgtadm --lld iscsi --op show --mode target
[root@ex333server init.d]#

通过命令创建的iscsi共享在系统重启或服务重启后消失。


2. 通过配置文件创建iscsi共享：
vim /etc/tgt/targets.conf
<target iqn.2012-05.com.example:ex333server.demo>
    backing-store /dev/vg_iscsi/lv_iscsi_demo
    initiator-address 192.168.221.0/24
</target>

<target iqn.2012-05.com.example:ex333server.target244>
    backing-store /dev/vg_iscsi/lv_iscsi_244
    initiator-address 192.168.221.244
</target>
         

[root@ex333server tgt]# service tgtd restart
Stopping SCSI target daemon: Stopping target framework daemon
                                                           [  OK  ]
Starting SCSI target daemon: Starting target framework daemon

[root@ex333server tgt]# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2012-05.com.example:ex333server.demo
    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: 4 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: /dev/vg_iscsi/lv_iscsi_demo
    Account information:
    ACL information:
        192.168.221.0/24
Target 2: iqn.2012-05.com.example:ex333server.target244
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00020000
            SCSI SN: beaf20
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: None
        LUN: 1
            Type: disk
            SCSI ID: IET     00020001
            SCSI SN: beaf21
            Size: 4 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: /dev/vg_iscsi/lv_iscsi_244
    Account information:
    ACL information:
        192.168.221.244
[root@ex333server tgt]#


找台244的虚机当客户端测试下：
[root@localhost rules.d]# ifconfig bond0
bond0     Link encap:Ethernet  HWaddr 00:0C:29:F7:5A:00  
          inet addr:192.168.221.244  Bcast:192.168.221.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fef7:5a00/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:11680 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6070 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6193467 (5.9 MiB)  TX bytes:901920 (880.7 KiB)

yum install iscsi-initiator-utils.x86_64
service iscsi restart
chkconfig iscsi on

[root@localhost init.d]# iscsiadm --mode discovery --type sendtargets --portal 192.168.221.254
192.168.221.254:3260,1 iqn.2012-05.com.example:ex333server.demo
192.168.221.254:3260,1 iqn.2012-05.com.example:ex333server.target244

[root@localhost init.d]# iscsiadm --mode node --targetname iqn.2012-05.com.example:ex333server.target244 --portal 192.168.221.254:3260 --login
Logging in to [iface: default, target: iqn.2012-05.com.example:ex333server.target244, portal: 192.168.221.254,3260]
Login to [iface: default, target: iqn.2012-05.com.example:ex333server.target244, portal: 192.168.221.254,3260]: successful


[root@localhost init.d]# fdisk -l

Disk /dev/sda: 85.8 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          25      200781   83  Linux
/dev/sda2              26        1330    10482412+  83  Linux
/dev/sda3            1331        1591     2096482+  82  Linux swap / Solaris

Disk /dev/sdb: 4 MB, 4194304 bytes
1 heads, 8 sectors/track, 1024 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/sdb doesn't contain a valid partition table

可以看到4M的sdb已经挂载到本地了。


小贴士：
无论时iscsi客户端还是服务端，包装完后服务都没有启动，在使用前需先启动相关服务；
较长的几个命令可直接在man里找（man tgtd，man iscsiadm）；
记不清包的具体名称可通过yum的搜索功能：yum search scsi。