在之前文章《multipath多路径实验01-构建iSCSI模拟环境》中，已经介绍了如何构建iSCSI模拟环境（RHEL6），但在RHEL7中已经不适用，本文记录下新的配置方法。

环境：RHEL 7.3

1.LVM创建

在RHEL7.3中，对于lvm操作部分与之前RHEL6版本没有区别,还是创建pv，vg，lv的方法，命令参考如下：

pvcreate /dev/sdb

vgcreate vg_storage /dev/sdb

lvcreate -L 1g -n lv_lun1 vg_storage

lvcreate -L 1g -n lv_lun2 vg_storage

lvcreate -L 1g -n lv_lun3 vg_storage

lvcreate -L 40g -n lv_lun4 vg_storage

lvcreate -L 10g -n lv_lun5 vg_storage

lvcreate -L 10g -n lv_lun6 vg_storage

lvcreate -L 10g -n lv_lun7 vg_storage

lvcreate -L 16g -n lv_lun8 vg_storage

最终可以看到新建的lv信息：

[root@Storage-B yum.repos.d]# lvs

  LV      VG         Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert

  home    rhel       -wi-ao---- 23.33g

  root    rhel       -wi-ao---- 47.79g

  swap    rhel       -wi-ao----  7.88g

  lv_lun1 vg_storage -wi-a-----  1.00g

  lv_lun2 vg_storage -wi-a-----  1.00g

  lv_lun3 vg_storage -wi-a-----  1.00g

  lv_lun4 vg_storage -wi-a----- 40.00g

  lv_lun5 vg_storage -wi-a----- 10.00g

  lv_lun6 vg_storage -wi-a----- 10.00g

  lv_lun7 vg_storage -wi-a----- 10.00g

  lv_lun8 vg_storage -wi-a----- 16.00g

2.服务端配置

之前在RHEL6中安装的iscsi服务端rpm包的名字是：scsi-target-utils，这在RHEL7中变成了targetd、targetcli这两个包。
**2.1 使用yum安装targetd和targetcli**

yum -y install targetd targetcli

systemctl status targetd

systemctl start targetd

systemctl enable targetd

systemctl list-unit-files|grep targetd

同时确认targetd服务启动状态和开启启动。

2.2 使用targetcli创建设备

targetcli进入命令行，cd到/backstores/block 目录下，创建设备：

create disk1 /dev/mapper/vg_storage-lv_lun1

create disk2 /dev/mapper/vg_storage-lv_lun2

create disk3 /dev/mapper/vg_storage-lv_lun3

create disk4 /dev/mapper/vg_storage-lv_lun4

create disk5 /dev/mapper/vg_storage-lv_lun5

create disk6 /dev/mapper/vg_storage-lv_lun6

create disk7 /dev/mapper/vg_storage-lv_lun7

create disk8 /dev/mapper/vg_storage-lv_lun8

创建完成，可以成功看到：

/backstores/block> ls

o- block ...................................................................................................... [Storage Objects: 8]

  o- disk1 ........................................................ [/dev/mapper/vg_storage-lv_lun1 (1.0GiB) write-thru deactivated]

  o- disk2 ........................................................ [/dev/mapper/vg_storage-lv_lun2 (1.0GiB) write-thru deactivated]

  o- disk3 ........................................................ [/dev/mapper/vg_storage-lv_lun3 (1.0GiB) write-thru deactivated]

  o- disk4 ....................................................... [/dev/mapper/vg_storage-lv_lun4 (40.0GiB) write-thru deactivated]

  o- disk5 ....................................................... [/dev/mapper/vg_storage-lv_lun5 (10.0GiB) write-thru deactivated]

  o- disk6 ....................................................... [/dev/mapper/vg_storage-lv_lun6 (10.0GiB) write-thru deactivated]

  o- disk7 ....................................................... [/dev/mapper/vg_storage-lv_lun7 (10.0GiB) write-thru deactivated]

  o- disk8 ....................................................... [/dev/mapper/vg_storage-lv_lun8 (16.0GiB) write-thru deactivated]

2.3 使用targetcli创建iqn和LUN

然后cd到/iscsi目录下，创建iqn；cd到/iscsi/iqn.20...0be/tpg1/luns下创建LUN，参考命令如下：

cd /iscsi

create

cd /iscsi/iqn.20...0be/tpg1/luns

create /backstores/block/disk1

create /backstores/block/disk2

create /backstores/block/disk3

create /backstores/block/disk4

create /backstores/block/disk5

create /backstores/block/disk6

create /backstores/block/disk7

create /backstores/block/disk8

实际执行过程如下：

/backstores/block> cd /iscsi

/iscsi> ls

o- iscsi .............................................................................................................. [Targets: 0]

/iscsi> create

Created target iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be.

Created TPG 1.

Global pref auto_add_default_portal=true

Created default portal listening on all IPs (0.0.0.0), port 3260.

/iscsi> ls

o- iscsi .............................................................................................................. [Targets: 1]

  o- iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be ......................................................... [TPGs: 1]

    o- tpg1 ................................................................................................. [no-gen-acls, no-auth]

      o- acls ............................................................................................................ [ACLs: 0]

      o- luns ............................................................................................................ [LUNs: 0]

      o- portals ...................................................................................................... [Portals: 1]

        o- 0.0.0.0:3260 ....................................................................................................... [OK]

/iscsi/iqn.20...0be/tpg1/luns> ls

o- luns .................................................................................................................. [LUNs: 8]

  o- lun0 ........................................................................... [block/disk1 (/dev/mapper/vg_storage-lv_lun1)]

  o- lun1 ........................................................................... [block/disk2 (/dev/mapper/vg_storage-lv_lun2)]

  o- lun2 ........................................................................... [block/disk3 (/dev/mapper/vg_storage-lv_lun3)]

  o- lun3 ........................................................................... [block/disk4 (/dev/mapper/vg_storage-lv_lun4)]

  o- lun4 ........................................................................... [block/disk5 (/dev/mapper/vg_storage-lv_lun5)]

  o- lun5 ........................................................................... [block/disk6 (/dev/mapper/vg_storage-lv_lun6)]

  o- lun6 ........................................................................... [block/disk7 (/dev/mapper/vg_storage-lv_lun7)]

  o- lun7 ........................................................................... [block/disk8 (/dev/mapper/vg_storage-lv_lun8)]

/iscsi/iqn.20...0be/tpg1/luns>

2.4 使用targetcli创建acls

cd到acls目录下，创建client；然后cd到portals目录下创建portals, 参考命令如下：

cd /iscsi/iqn.20...0be/tpg1/acls

create iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be:client

cd /iscsi/iqn.20...0be/tpg1/portals

delete 0.0.0.0 3260

create 10.10.1.21

create 10.10.2.21

实际执行过程如下：

/iscsi/iqn.20.../tpg1/portals> pwd

/iscsi/iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be/tpg1/portals

/iscsi/iqn.20.../tpg1/portals> ls

o- portals ............................................................................................................ [Portals: 2]

  o- 10.10.1.21:3260 .......................................................................................................... [OK]

  o- 10.10.2.21:3260 .......................................................................................................... [OK]

2.5 使用targetcli查看当前配置信息

在/下执行ls，或者ls /查看当前配置信息：

/iscsi/iqn.20.../tpg1/portals> ls /

o- / ......................................................................................................................... [...]

  o- backstores .............................................................................................................. [...]

  | o- block .................................................................................................. [Storage Objects: 8]

  | | o- disk1 ...................................................... [/dev/mapper/vg_storage-lv_lun1 (1.0GiB) write-thru activated]

  | | o- disk2 ...................................................... [/dev/mapper/vg_storage-lv_lun2 (1.0GiB) write-thru activated]

  | | o- disk3 ...................................................... [/dev/mapper/vg_storage-lv_lun3 (1.0GiB) write-thru activated]

  | | o- disk4 ..................................................... [/dev/mapper/vg_storage-lv_lun4 (40.0GiB) write-thru activated]

  | | o- disk5 ..................................................... [/dev/mapper/vg_storage-lv_lun5 (10.0GiB) write-thru activated]

  | | o- disk6 ..................................................... [/dev/mapper/vg_storage-lv_lun6 (10.0GiB) write-thru activated]

  | | o- disk7 ..................................................... [/dev/mapper/vg_storage-lv_lun7 (10.0GiB) write-thru activated]

  | | o- disk8 ..................................................... [/dev/mapper/vg_storage-lv_lun8 (16.0GiB) write-thru activated]

  | o- fileio ................................................................................................. [Storage Objects: 0]

  | o- pscsi .................................................................................................. [Storage Objects: 0]

  | o- ramdisk ................................................................................................ [Storage Objects: 0]

  o- iscsi ............................................................................................................ [Targets: 1]

  | o- iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be ....................................................... [TPGs: 1]

  |   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]

  |     o- acls .......................................................................................................... [ACLs: 1]

  |     | o- iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be:client ................................... [Mapped LUNs: 8]

  |     |   o- mapped_lun0 ................................................................................. [lun0 block/disk1 (rw)]

  |     |   o- mapped_lun1 ................................................................................. [lun1 block/disk2 (rw)]

  |     |   o- mapped_lun2 ................................................................................. [lun2 block/disk3 (rw)]

  |     |   o- mapped_lun3 ................................................................................. [lun3 block/disk4 (rw)]

  |     |   o- mapped_lun4 ................................................................................. [lun4 block/disk5 (rw)]

  |     |   o- mapped_lun5 ................................................................................. [lun5 block/disk6 (rw)]

  |     |   o- mapped_lun6 ................................................................................. [lun6 block/disk7 (rw)]

  |     |   o- mapped_lun7 ................................................................................. [lun7 block/disk8 (rw)]

  |     o- luns .......................................................................................................... [LUNs: 8]

  |     | o- lun0 ................................................................... [block/disk1 (/dev/mapper/vg_storage-lv_lun1)]

  |     | o- lun1 ................................................................... [block/disk2 (/dev/mapper/vg_storage-lv_lun2)]

  |     | o- lun2 ................................................................... [block/disk3 (/dev/mapper/vg_storage-lv_lun3)]

  |     | o- lun3 ................................................................... [block/disk4 (/dev/mapper/vg_storage-lv_lun4)]

  |     | o- lun4 ................................................................... [block/disk5 (/dev/mapper/vg_storage-lv_lun5)]

  |     | o- lun5 ................................................................... [block/disk6 (/dev/mapper/vg_storage-lv_lun6)]

  |     | o- lun6 ................................................................... [block/disk7 (/dev/mapper/vg_storage-lv_lun7)]

  |     | o- lun7 ................................................................... [block/disk8 (/dev/mapper/vg_storage-lv_lun8)]

  |     o- portals .................................................................................................... [Portals: 2]

  |       o- 10.10.1.21:3260 .................................................................................................. [OK]

  |       o- 10.10.2.21:3260 .................................................................................................. [OK]

  o- loopback ......................................................................................................... [Targets: 0]

/iscsi/iqn.20.../tpg1/portals>

最后配置防火墙策略，或者直接关闭防火墙，建议后者，视具体要求而定。

--防火墙添加放行tcp 3260端口：

firewall-cmd --permanent --add-port=3260/tcp

firewall-cmd --reload

--关闭防火墙：

systemctl disable firewalld

systemctl stop firewalld

3.客户端配置

**3.1 使用yum安装iscsi-initiator-utils**

yum -y install iscsi-initiator-utils

3.2 编辑/etc/iscsi/initiatorname.iscsi

vi /etc/iscsi/initiatorname.iscsi

#InitiatorName=iqn.1994-05.com.redhat:babc7da33c48

InitiatorName=iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be:client

注释之前的示例，添加一行实际的配置。

3.3 使用iscsiadm发现可用存储设备并登陆连接

iscsiadm -m discovery -t st -p 10.10.1.21

[root@db92 yum.repos.d]# iscsiadm -m discovery -t st -p 10.10.1.21

10.10.1.21:3260,1 iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be

10.10.2.21:3260,1 iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be

登陆连接：

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be -p 10.10.1.21 --login

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.storage-b.x8664:sn.46b1dc2750be -p 10.10.2.21 --login

此时使用fdisk -l 查看已经正常显示所有设备：

[root@db90 ~]# fdisk -l

Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: 0x0001b841

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     2099199     1048576   83  Linux

/dev/sda2         2099200   167772159    82836480   8e  Linux LVM

Disk /dev/mapper/rhel-root: 51.3 GB, 51308920832 bytes, 100212736 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/rhel-swap: 8455 MB, 8455716864 bytes, 16515072 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/rhel-home: 25.1 GB, 25052577792 bytes, 48930816 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: 1073 MB, 1073741824 bytes, 2097152 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

Disk /dev/sdc: 1073 MB, 1073741824 bytes, 2097152 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

Disk /dev/sdd: 1073 MB, 1073741824 bytes, 2097152 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

Disk /dev/sde: 1073 MB, 1073741824 bytes, 2097152 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

Disk /dev/sdg: 1073 MB, 1073741824 bytes, 2097152 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

Disk /dev/sdf: 42.9 GB, 42949672960 bytes, 83886080 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

Disk /dev/sdh: 1073 MB, 1073741824 bytes, 2097152 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

Disk /dev/sdi: 10.7 GB, 10737418240 bytes, 20971520 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

Disk /dev/sdj: 42.9 GB, 42949672960 bytes, 83886080 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

Disk /dev/sdl: 10.7 GB, 10737418240 bytes, 20971520 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

Disk /dev/sdk: 10.7 GB, 10737418240 bytes, 20971520 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

Disk /dev/sdn: 10.7 GB, 10737418240 bytes, 20971520 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

Disk /dev/sdm: 10.7 GB, 10737418240 bytes, 20971520 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

Disk /dev/sdo: 10.7 GB, 10737418240 bytes, 20971520 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

Disk /dev/sdp: 17.2 GB, 17179869184 bytes, 33554432 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

Disk /dev/sdq: 17.2 GB, 17179869184 bytes, 33554432 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

[root@db90 ~]#

由于是两条链路，所以fdisk看到的存储LUN是两倍，后续再使用多路径软件聚合即可使用。

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