linux 7.4 版本 iscsi搭建共享存储实战
主机：
10.10.6.83 rac1
10.10.6.84 rac2
---版本
[root@rac1 iscsi]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
我在 rac1 主机上划分了一个50G的空间盘，打算用iscsi服务共享给两台主机rac1，rac2 ，下面是操作步骤
1、查看共享存储用的盘
[root@rac1 iscsi]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e5720
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 104857599 52222976 8e Linux LVM
/dev/sda3 104857600 209715199 52428800 5 Extended
/dev/sda5 104859648 209715199 52427776 83 Linux
Disk /dev/mapper/centos-root: 49.2 GB, 49178214400 bytes, 96051200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 4294 MB, 4294967296 bytes, 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
这里我用盘/dev/sda5 来做两台主机的共享存储
2、安装iscsi 客户端软件
yum -y installiscsi-initiator-utils
---重启服务
[root@rac2 iscsi]# systemctl restart iscsi
[root@rac2 iscsi]# systemctl enable iscsi
---修改两台主机iscsi客户识别号
[root@rac1 iscsi]# pwd
/etc/iscsi
[root@rac1 iscsi]# ls
initiatorname.iscsi iscsid.conf
[root@rac1 iscsi]# vi initiatorname.iscsi
InitiatorName=iqn.1994-05.com.redhat:rac1
[root@rac2 iscsi]# cat initiatorname.iscsi
InitiatorName=iqn.1994-05.com.redhat:rac2
3、在rac1 主机上 建立iscsi 服务
3.1 安装iscsi软件
[root@rac1etc]# yum install targetcli*
3.2 启动target服务
systemctl start target
systemctl enable target
3.3 进入管理控制台
[root@rac1etc]# targetcli
3.4 建立一个块储存server1，使用上面新添加硬盘/dev/sda5
/backstores/block create server1 /dev/sda5
创建完成后，会在 /backstores/block 下面可以看出多了server1
3.5 建立target的id ：
注意： iqn.1994-05.com.redhat:rac1 名称的选取一定要与server1 磁盘所对应的InitiatorName一样，（或者修改initiatorname.iscsi 文件内容）
建立一个名称iqn为iqn.1994-05.com.redhat:rac1
/> cd iscsi
/iscsi>create iqn.1994-05.com.redhat:rac1
3.6 设置哪些设备可以连接到此iqn上:
cd /iscsi/iqn.1994-05.com.redhat:rac1/tpg1/acls
create iqn.1994-05.com.redhat:rac2
create iqn.1994-05.com.redhat:rac1
3.7 lun 和具体的磁盘联系在一起，前面已经把/dev/sda5磁盘创建成了server1
Cd /iscsi/ iqn.1994-05.com.redhat:rac1/tpg1/luns
Create /backstores/block/server1
3.8 配置target监听IP和端口（默认在所有接口IP的3260/tcp监听）
Cd /iscsi/ iqn.1994-05.com.redhat:rac1/tpg1/portals
delete 0.0.0.03260
Create 10.10.6.83
Create 10.10.6.84
3.9 保存配置
/iscsi/iqn.20.../tpg1/portals>cd /
/>saveconfig
[root@rac1 iscsi]# iscsiadm -m discovery -t st -p 10.10.6.83
10.10.6.83:3260,1 iqn.1994-05.com.redhat:rac1
[root@rac2 iscsi]# cat initiatorname.iscsi
InitiatorName=iqn.1994-05.com.redhat:rac2
4 客户端登陆服务
[root@rac1iscsi]# iscsiadm -m discovery -t st -p 10.10.6.83
10.10.6.83:3260,1iqn.1994-05.com.redhat:rac1
[root@rac1iscsi]# iscsiadm -m node -T iqn.1994-05.com.redhat:rac1 -p 10.10.6.83:3260 -l
Logging in to[iface: default, target: iqn.1994-05.com.redhat:rac1, portal: 10.10.6.83,3260](multiple)
Login to[iface: default, target: iqn.1994-05.com.redhat:rac1, portal: 10.10.6.83,3260]successful.
[root@rac2iscsi]# iscsiadm -m discovery -t st -p 10.10.6.83
10.10.6.83:3260,1iqn.1994-05.com.redhat:rac1
[root@rac2iscsi]# iscsiadm -m node -T iqn.1994-05.com.redhat:rac1 -p 10.10.6.83:3260 -l
Logging in to[iface: default, target: iqn.1994-05.com.redhat:rac1, portal: 10.10.6.83,3260](multiple)
Login to[iface: default, target: iqn.1994-05.com.redhat:rac1, portal: 10.10.6.83,3260]successful.
[root@rac1 iscsi]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e5720
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 104857599 52222976 8e Linux LVM
/dev/sda3 104857600 209715199 52428800 5 Extended
/dev/sda5 104859648 209715199 52427776 83 Linux
Disk /dev/mapper/centos-root: 49.2 GB, 49178214400 bytes, 96051200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 4294 MB, 4294967296 bytes, 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdb: 53.7 GB, 53686042624 bytes, 104855552 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 33550336 bytes
磁盘共享成功