http://www.linuxidc.com/Linux/2015-04/116093.htmRHCE7認證學習筆記34——配置ISCSI
[日期：2015-04-12] | 來源：Linux社區 作者：linjohn |
RHCE7認證學習筆記34——配置ISCSI
一、存儲設備類型
DSA：直接區域存儲
NAS:網絡區域存儲
SAN：存儲區域網絡，塊級別共享
二、配置iscsi服務器端
這裏舉例子說明，假如服務器有2個分區/dev/sdb7,/dev/sdb8要共享出去:
/dev/sdb7 1230848 1640447 200M Linux filesyste
/dev/sdb8 1640448 2459647 400M Linux filesyste
安裝target包：
[root@linuxidc ~]# yum install target\* -y
啓動target服務
[root@linuxidc ~]# systemctl start target
配置步驟：
1、準備要共享的塊；
使用targetcli命令進入target配置界面：
[root@linuxidc ~]# targetcli
/> pwd
/
/> ls
o- / .........................................................................................................................[...]
o- backstores..............................................................................................................[...]
| o- block ..................................................................................................[Storage Objects: 0]
| o- fileio.................................................................................................[Storage Objects: 0]
| o- pscsi ..................................................................................................[Storage Objects: 0]
| o- ramdisk................................................................................................[Storage Objects: 0]
o- iscsi............................................................................................................[Targets: 0]
o- loopback.........................................................................................................[Targets: 0]
進入backstores/block目錄創建要共享的塊，創建block1和block2：
/> cd backstores/
/backstores> ls
o- backstores................................................................................................................[...]
o- block ....................................................................................................[Storage Objects: 0]
o- fileio...................................................................................................[Storage Objects: 0]
o- pscsi ....................................................................................................[Storage Objects: 0]
o- ramdisk..................................................................................................[Storage Objects: 0]
/backstores/block> create block1 dev=/dev/sdb7
Created block storage object block1 using /dev/sdb7.
/backstores/block> create block2 dev=/dev/sdb8
Created block storage object block2 using /dev/sdb8.
/backstores/block>ls
o- block......................................................................................................[Storage Objects: 2]
o- block1..........................................................................[/dev/sdb7 (200.0MiB) write-thru deactivated]
o- block2..........................................................................[/dev/sdb8 (400.0MiB) write-thru deactivated]
exit退出保存targetcli，並重新進入：
/backstores/block> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
[root@linuxidc ~]# targetcli
2、創建一個target;
target標準名字格式：
年 月 域名倒寫名字
iqn.2015-02.com.sg:disk1
進入iscsi目錄，創建target:
/iscsi>create iqn.2015-02.com.sg:disk1
/iscsi> ls
o- iscsi..............................................................................................................[Targets: 1]
o- iqn.2015-02.com.sg:disk1............................................................................................[TPGs: 1]
3、在target上面創建一個lun；
進入/iscsi/iqn.2015-02.com.sg:disk1/tpg1目錄：
/iscsi/iqn.20...sg:disk1/tpg1> ls
o- tpg1.....................................................................................................[no-gen-acls, no-auth]
o- acls................................................................................................................[ACLs: 0]
o- luns................................................................................................................[LUNs: 0]
o- portals..........................................................................................................[Portals: 0]
acls目錄創建共享密碼：
/iscsi/iqn.20...sg:disk1/tpg1> acls/ createiqn.2015-02.com.sg:diskpasswd
創建lun:
/iscsi/iqn.20...sg:disk1/tpg1> luns/ create /backstores/block/block1
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2015-02.com.sg:diskpasswd
/iscsi/iqn.20...sg:disk1/tpg1> luns/ create /backstores/block/block2
Created LUN 1.
Created LUN 1->1 mapping in node ACL iqn.2015-02.com.sg:diskpasswd
o-luns..........................................................................................................[LUNs: 2]
| | o- lun0.......................................................................................[block/block1 (/dev/sdb7)]
| | o- lun1.......................................................................................[block/block2 (/dev/sdb8)]
portal創建共享端口和地址：
/iscsi/iqn.20...sg:disk1/tpg1> portals/ create 10.35.89.32
Using default IP port 3260
Created network portal 10.35.89.32:3260.
exit退出並保存：
Configurationsaved to /etc/target/saveconfig.json
配置文件保存在：/etc/target/saveconfig.json，可以直接修改配置文件
三、客戶端配置iscsi連接
安裝target包：
[root@client ~]# yum install target\* -y
查看fuw服務器端共享的內容：
[root@client ~]# iscsiadm -m discovery -t st -p 10.35.89.32
10.35.89.32:3260,1 iqn.2015-02.com.sg:disk1
編輯/etc/iscsi/initiatorname.iscsi文件，配置服務器端共享的名字和密碼：
InitiatorName=iqn.2015-02.com.sg:diskpasswd
重啓iscscid服務：
[root@client~]# systemctl restart iscsid.service
掛載服務器端共享的內容：
[root@client~]# iscsiadm -m node -T iqn.2015-02.com.sg:disk1 -p 10.35.89.32 -l
掛載成功後，使用fdisk命令即可查看到新增加的兩塊磁盤：
斷開掛載的連接：
[root@client ~]# iscsiadm -m node -T iqn.2015-02.com.sg:disk1 -p 10.35.89.32 -u
使用fdisk命令劃分共享的磁盤，格式化，並掛載文件夾，編輯fstab文件設置開機自動掛載：
[root@client ~]# fdisk /dev/sdb
DeviceBoot Start End Blocks Id System
/dev/sdb1 8192 114687 53248 83 Linux
[root@client~]# mkfs.xfs /dev/sdb1
[root@client/]# mount /dev/sdb1 /aa
編輯fstab文件時候，將default換成_netdev參數：
/dev/sdb1 /aa xfs _netdev 0 0
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