一、配置環(huán)境（Vmware WorkStation虛擬環(huán)境）

服務(wù)端與客戶端OS：openEuler 22.03-LTS

CPU：1U1C

內(nèi)存：2G

硬盤：5個SCSI磁盤，其中一個作為系統(tǒng)盤，另外四個配置為RAID5陣列

服務(wù)器IP：192.168.17.200

二、詳細配置過程

1、配置RAID5

mdadm -Cv /dev/md0 -n 3 -l 5 -x 1 /dev/sdb /dev/sdc /dev/sdd /dev/sde

其中，-Cv參數(shù)為創(chuàng)建陣列并顯示過程，/dev/md0為生成的陣列組名稱，-n 3參數(shù)為創(chuàng)建RAID 5磁盤陣列所需的硬盤個數(shù)，-l 5參數(shù)為RAID磁盤陣列的級別，-x 1參數(shù)為磁盤陣列的備份盤個數(shù)。

執(zhí)行以下命令查看RAID5陣列詳情

mdadm -D /dev/md0

2、配置iSCSI服務(wù)端

（1）在服務(wù)器上安裝iSCSI服務(wù)軟件包

dnf install -y targetcli

（2）配置iSCSI服務(wù)端共享資源

• 查看iSCSI服務(wù)端共享資源

[root@ipsan ~]# targetcli
targetcli shell version 2.1.54
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> 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]
  o- vhost ................................................................................................ [Targets: 0]
  o- xen-pvscsi ........................................................................................... [Targets: 0]

• 將前面創(chuàng)建的RAID 5磁盤陣列md0作為iSCSI共享設(shè)備

/> cd /backstores/block
/backstores/block> create disk0 /dev/md0
Created block storage object disk0 using /dev/md0.
/backstores/block> cd /
/> ls
o- / ............................................................................................................. [...]
  o- backstores .................................................................................................. [...]
  | o- block ...................................................................................... [Storage Objects: 1]
  | | o- disk0 ............................................................. [/dev/md0 (40.0GiB) write-thru deactivated]
  | |   o- alua ....................................................................................... [ALUA Groups: 1]
  | |     o- default_tg_pt_gp ........................................................... [ALUA state: Active/optimized]
  | o- fileio ..................................................................................... [Storage Objects: 0]
  | o- pscsi ...................................................................................... [Storage Objects: 0]
  | o- ramdisk .................................................................................... [Storage Objects: 0]
  o- iscsi ................................................................................................ [Targets: 0]
  o- loopback ............................................................................................. [Targets: 0]
  o- vhost ................................................................................................ [Targets: 0]
  o- xen-pvscsi ........................................................................................... [Targets: 0]

• 創(chuàng)建iSCSI target名稱及配置共享資源

/> cd iscsi 
/iscsi> create 
Created target iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195.
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.ipsan.x8664:sn.a54ce739d195 ................................................. [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> cd iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195/
/iscsi/iqn.20....a54ce739d195> cd tpg1/luns
/iscsi/iqn.20...195/tpg1/luns> create /backstores/block/disk0
Created LUN 0.

• 設(shè)置訪問控制列表（ACL）

iSCSI協(xié)議通過客戶端名稱進行驗證的。即iSCSI客戶端的名稱與服務(wù)端中設(shè)置的訪問控制列表中某一名稱條目一致即可。acls參數(shù)目錄用于存放能夠訪問iSCSI服務(wù)端共享存儲資源的客戶端名稱，推薦在前面系統(tǒng)生成的iSCSI target后面追加上類似于:client的參數(shù)，這樣既能保證客戶端的名稱具有唯一性，又非常便于管理和閱讀。

/iscsi/iqn.20...195/tpg1/luns> cd ../acls 
/iscsi/iqn.20...195/tpg1/acls> create iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195:client
Created Node ACL for iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195:client
Created mapped LUN 0.

• 設(shè)置iSCSI服務(wù)端的監(jiān)聽IP地址和端口號

默認情況下，iSCSI允許所有網(wǎng)卡提供iSCSI服務(wù)，但這種配置存在安全隱患，可以刪除默認配置，然后指定服務(wù)接口IP地址。

/iscsi/iqn.20...195/tpg1/acls> cd ../portals/
/iscsi/iqn.20.../tpg1/portals> ls
o- portals ................................................................................................ [Portals: 1]
  o- 0.0.0.0:3260 ................................................................................................. [OK]
/iscsi/iqn.20.../tpg1/portals> delete 0.0.0.0 3260
Deleted network portal 0.0.0.0:3260
/iscsi/iqn.20.../tpg1/portals> create 192.168.17.200
Using default IP port 3260
Created network portal 192.168.17.200:3260.

• 查看并確認配置

/iscsi/iqn.20.../tpg1/portals> cd /
/> ls
o- / ............................................................................................................. [...]
  o- backstores .................................................................................................. [...]
  | o- block ...................................................................................... [Storage Objects: 1]
  | | o- disk0 ............................................................... [/dev/md0 (40.0GiB) write-thru activated]
  | |   o- alua ....................................................................................... [ALUA Groups: 1]
  | |     o- default_tg_pt_gp ........................................................... [ALUA state: Active/optimized]
  | 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.ipsan.x8664:sn.a54ce739d195 ............................................... [TPGs: 1]
  |   o- tpg1 ................................................................................... [no-gen-acls, no-auth]
  |     o- acls .............................................................................................. [ACLs: 1]
  |     | o- iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195:client ........................... [Mapped LUNs: 1]
  |     |   o- mapped_lun0 ..................................................................... [lun0 block/disk0 (rw)]
  |     o- luns .............................................................................................. [LUNs: 1]
  |     | o- lun0 .......................................................... [block/disk0 (/dev/md0) (default_tg_pt_gp)]
  |     o- portals ........................................................................................ [Portals: 1]
  |       o- 192.168.17.200:3260 .................................................................................. [OK]
  o- loopback ............................................................................................. [Targets: 0]
  o- vhost ................................................................................................ [Targets: 0]
  o- xen-pvscsi ........................................................................................... [Targets: 0]

• 保存配置

/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup/.
Configuration saved to /etc/target/saveconfig.json

3、配置防火墻，放行iSCSI服務(wù)

[root@ipsan ~]# firewall-cmd --permanent --zone=public --add-port=3260/tcp
[root@ipsan ~]# firewall-cmd --reload

4、配置iSCSI客戶端

以下操作在iSCSI客戶端完成

（1）安裝iSCSI客戶端服務(wù)程序initiator

dnf install iscsi-initiator-utils

（2）編輯iSCSI客戶端配置文件

CNA01:~ # vi /etc/iscsi/initiatorname.iscsi 

InitiatorName=iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195:client

（3）重啟iSCSI服務(wù)

systemctl restart iscsid
systemctl enable  iscsid

（3）掃描發(fā)現(xiàn)遠程iSCSI服務(wù)端

iscsiadm -m discovery -t st -p 192.168.17.200

其中，-m discovery參數(shù)的目的是掃描并發(fā)現(xiàn)可用的存儲資源，-t st參數(shù)為執(zhí)行掃描操作的類型，-p 192.168.17.200參數(shù)為iSCSI服務(wù)端的IP地址

（4）登錄iSCSI服務(wù)端

CNA01:~ # iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195 -p 192.168.17.200 --login
Logging in to [iface: default, target: iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195, portal: 192.168.17.200,3260] (multiple)
Login to [iface: default, target: iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195, portal: 192.168.17.200,3260] successful.

其中，-m node參數(shù)為將客戶端所在主機作為一臺節(jié)點服務(wù)器，-T參數(shù)為要使用的存儲資源，-p 192.168.17.200參數(shù)為iSCSI服務(wù)端的IP地址，--login或-l參數(shù)表示登錄。

（4）查看共享設(shè)備

在iSCSI客戶端成功登錄之后，會在客戶端主機上多出一塊名為/dev/sdb的設(shè)備文件。

CNA01:~ #  ls -l /dev/sdb
brw-rw---- 1 root disk 8, 16 Feb 21 05:19 /dev/sdb
CNA01:~ # file /dev/sdb 
/dev/sdb: block special (8/16)

（5）格式化共享設(shè)備

CNA01:~ # mkfs.ext4 /dev/sdb
mke2fs 1.45.0 (6-Mar-2019)
/dev/sdb is apparently in use by the system; will not make a filesystem here!

若出現(xiàn)上述錯誤，則執(zhí)行以下命令解決問題

CNA01:~ # dmsetup remove_all
CNA01:~ # dmsetup status

正常格式化共享設(shè)備的輸出信息如下

CNA01:~ # mkfs.ext4 /dev/sdb
mke2fs 1.45.0 (6-Mar-2019)
Creating filesystem with 10477056 4k blocks and 2621440 inodes
Filesystem UUID: f012928f-9e69-4631-b0bc-1d97e75a305b
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (65536 blocks): done
Writing superblocks and filesystem accounting information: done

（6）編輯/etc/fstab配置文件

因是網(wǎng)絡(luò)共享設(shè)備，通常采用UUID進行掛載，且掛載選項中選用_netdev參數(shù)。

CNA01:~ # blkid | grep /dev/sdb
/dev/sdb: UUID="f012928f-9e69-4631-b0bc-1d97e75a305b" TYPE="ext4"?

CNA01:~ # vi /etc/fstab
……在文件末尾添加以下掛載信息……
UUID="f012928f-9e69-4631-b0bc-1d97e75a305b" /iscsi      ext4    defaults,_netdev 0 0?

（7）掛載共享設(shè)備

CNA01:~ # mkdir /iscsi
CNA01:~ # mount -a

注：如果不再需要使用iSCSI共享設(shè)備資源了，可以用iscsiadm命令的-u參數(shù)將其設(shè)備卸載，命令如下：文章來源地址http://www.zghlxwxcb.cn/news/detail-832338.html

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.ipsan.x8664:sn.a54ce739d195 -u

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