iscsi-分区类型

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iSCSI简介(Internet SCSI):

iSCSI 小型计算机系统接口,IBM公司研发,用于在IP网络上运行SCSI协议;解决了 SCSI需要直连存储设备的局限性;可以不停机扩展存储容量,iSCSI 将 SCSI 接口与 Ethernet 技术结合,使服务器可与使用 IP 网络的存储装置互相交换数据;基于 TCP/IP 协议,创建 SAN,以数据块级别在多个数据存储网络间进行传输


iSCSI 主要功能:
在 TCP/IP 网络上的主机系统(initiator 启动器)和存储设备(target 目标器之间进行数据的封装和可靠传输。
iSCSI 启动器是客户端设备,启动器可以由软件或硬件实现;
·软件:iscsi-initiator-utils(RPM 免费提供的 Linux-Open-iSCSI 驱动)
·硬件:iSCSI HBA(或 TCP 卸载引擎[TOE] 卡) -> 本质使一个专用以太网卡,
其上的 SCSI ASIC 可以从系统CPU内卸载所有工作(TCP 和 SCSI 命令)
iSCSI 目标是 iSCSI 网络的“服务器”组件。通常为一个存储设备

环境准备

两台RHEL虚拟机(拍初始化快照):

  • node1(192.168.22.77)target端( iSCSI服务端)

  • client1(192.168.22.107)initiator端( iSCSI客户端)

一、iSCSI配置

target端分区

[[email protected] ~]# lsblk 
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda             8:0    0   40G  0 disk 
├─sda1          8:1    0  512M  0 part /boot
└─sda2          8:2    0 25.5G  0 part 
  ├─rhel-swap 253:0    0  512M  0 lvm  [SWAP]
  └─rhel-root 253:1    0   25G  0 lvm  /
sr0            11:0    1  3.6G  0 rom  /mnt/cdrom
[[email protected] ~]# fdisk /dev/sda 
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/sda: 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 / 512 bytes
Disk label type: dos
Disk identifier: 0x0009ed86

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1050623      524288   83  Linux
/dev/sda2         1050624    54544383    26746880   8e  Linux LVM

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p): 
Using default response p
Partition number (3,4, default 3): 
First sector (54544384-83886079, default 54544384): 
Using default value 54544384
Last sector, +sectors or +sizeK,M,G (54544384-83886079, default 83886079): +5G     
Partition 3 of type Linux and of size 5 GiB is set

Command (m for help): p

Disk /dev/sda: 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 / 512 bytes
Disk label type: dos
Disk identifier: 0x0009ed86

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1050623      524288   83  Linux
/dev/sda2         1050624    54544383    26746880   8e  Linux LVM
/dev/sda3        54544384    65030143     5242880   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[[email protected] ~]# partprobe /dev/sda

 [[email protected] ~]# lsblk
 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
 sda 8:0 0 40G 0 disk
 ├─sda1 8:1 0 512M 0 part /boot
 ├─sda2 8:2 0 25.5G 0 part
 │ ├─rhel-swap 253:0 0 512M 0 lvm [SWAP]
 │ └─rhel-root 253:1 0 25G 0 lvm /
 └─sda3 8:3 0 5G 0 part
 sr0 11:0 1 3.6G 0 rom /mnt/cdrom

配置yum仓库(all)

vim /etc/yum.repos.d/a.repo
[a]
name=a
baseurl=file:///mnt/cdrom
enabled=1
gpgcheck=0
[[email protected] ~]# mkdir /mnt/cdrom
[[email protected] ~]# mount /dev/sr0 /mnt/cdrom
mount: /dev/sr0 is write-protected, mounting read-only
[[email protected] ~]# 
[[email protected] ~]# 
[[email protected] ~]# yum repolist
Loaded plugins: langpacks, product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
a                                                                   | 4.1 kB  00:00:00     
(1/2): a/group_gz                                                   | 134 kB  00:00:00     
(2/2): a/primary_db                                                 | 3.4 MB  00:00:00     
repo id                       repo name                                         status
a                             a                                                  4,371
repolist: 4,371

 

关闭防火墙及selinux(all)

[[email protected] ~]# systemctl stop firewalld
[[email protected] ~]# systemctl disable firewalld
rm /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service
rm /etc/systemd/system/basic.target.wants/firewalld.service
[[email protected] ~]# setenforce 0

target端配置:

 

1.安装targetcli

[[email protected] ~]# yum -y install targetcli

2. 运行targetcli

[[email protected] ~]# targetcli

2.1 创建后端存储

/> backstores/block create  name=nsd    dev=/dev/sda3

2.2 创建target

/> iscsi/  create   iqn.2019-06.vip.kklinux:node1

注意:IQN 的格式为:iqn.年份-月份.反向域名:自定义标识

如:iqn.2019-06.vip.kklinux:node1;其中的字母均应为小写,即使输入时包含大写,命令执行后,系统会自动转换成小写。 

2.3 创建lun逻辑单元

/iscsi> cd /iscsi/iqn.2019-06.vip.kklinux:node1/tpg1/luns 
/iscsi/iqn.20...de1/tpg1/luns> create /backstores/block/nsd 

2.4 配置acl访问控制(设置访问服务时客户端声称的名字)

/iscsi> cd /iscsi/iqn.2019-06.vip.kklinux:node1/tpg1/acls
/iscsi/iqn.20...de1/tpg1/acls>create iqn.2019-06.vip.kklinux:client1

//客户端配置的名称应与上面一致

如果需要配置用户和密码

cd /iscsi/iqn.2019-06.vip.kklinux:node1/tpg1/acls/iqn.2019-06.vip.kklinux:client1
/iscsi/iqn.20...kklinux:client1> set auth userid=username 
/iscsi/iqn.20...kklinux:client1> set auth password=password

2.5 退出

/iscsi/iqn.20...de1/tpg1/acls> exit

3. 重启target服务,并设置开机自启

systemctl restart target
systemctl enable target

initiator端配置:

 

1. 装包iscsi-initiator-utils

[[email protected] ~]# yum install -y iscsi-initiator-utils

2. 修改配置文件

[[email protected] ~]# vi /etc/iscsi/initiatorname.iscsi 
InitiatorName=iqn.2019-06.vip.kklinux:client1      //名称应与服务端acl配置的名称一致

如果target端配置了用户和密码还需添加

node.session.auth.authmethod = CHAP
node.session.auth.username = username
node.session.auth.password = password

 

3. 重启服务 iscsid 

[[email protected] ~]# systemctl restart iscsid             //更新IQN标识。注意是:iscsid

4. 发现服务端IQN

[[email protected]~]# iscsiadm -m discovery -t st -p 192.168.22.77 
192.168.22.77:3260,1 iqn.2019-06.vip.kklinux:node1

5. 识别服务端共享

 

[[email protected] ~]# systemctl restart iscsi
[[email protected] ~]# systemctl enable iscsi
[[email protected] ~]# lsblk 
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda             8:0    0   60G  0 disk 
├─sda1          8:1    0    2M  0 part 
├─sda2          8:2    0    1G  0 part /boot
└─sda3          8:3    0   34G  0 part 
  ├─rhel-root 253:0    0   30G  0 lvm  /
  └─rhel-swap 253:1    0    4G  0 lvm  [SWAP]
sdb             8:16   0    5G  0 disk 
sr0            11:0    1  3.5G  0 rom  /mnt/cdrom

 

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