ISCSI共享

共享存储

ISCSI共享

服务端

• 软件安装

Install epel-release:
# yum install epel-release
Install scsi-target-utils rpm package:
# yum install scsi-target-utils

• 修改配置文件

vi /etc/tgt/targets.conf

<target iqn.2020-0930:disk2> #iqn名称
backing-store /dev/sdc # Becomes LUN 1 添加磁盘
initiator-address ALL #创建ACL，允许哪些主机访问
</target>

• 启动iscsi服务

[root@localhost ~]# systemctl start tgtd

• 查看共享磁盘情况

tgtadm --lld iscsi --op show --mode target

[root@localhost ~]# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2020-0930:disk2
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 85899 MB, Block size: 512
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: rdwr
Backing store path: /dev/sdc
Backing store flags:
Account information:
ACL information:
ALL

客户端挂载

• 安装iscsi客户端程序

103、104、105客户端主机安装客户端工具

一般主机客户端都已经安装

yum install -y iscsi-initiator-utils

• 共享发现

查找存储对外提供的逻辑卷

iscsiadm -m discovery -d 3 -t sendtargets -p 172.16.176.100:3260

[root@host103 by-id]# iscsiadm -m discovery -d 3 -t sendtargets -p 172.16.176.100:3260
iscsiadm: ip 172.16.176.100, port 3260, tgpt -1
iscsiadm: Max file limits 131072 131072
iscsiadm: starting sendtargets discovery, address 172.16.176.100:3260,
iscsiadm: connecting to 172.16.176.100:3260
iscsiadm: connected local port 52476 to 172.16.176.100:3260
iscsiadm: connected to discovery address 172.16.176.100
iscsiadm: login response status 0000
iscsiadm: discovery process to 172.16.176.100:3260 exiting
iscsiadm: disconnecting conn 0x5606a75d5ad8, fd 3
172.16.176.100:3260,1 iqn.2020-0930:disk2

• 映射逻辑卷到Linux系统中

[root@host103 by-id]# iscsiadm -m node -T iqn.2020-0930:disk2 -p 172.16.176.100:3260 -l
Logging in to [iface: default, target: iqn.2020-0930:disk2, portal: 172.16.176.100,3260] (multiple)
Login to [iface: default, target: iqn.2020-0930:disk2, portal: 172.16.176.100,3260] successful.
[root@host103 by-id]#

• 设置开机自动映射

[root@host103 by-id]# iscsiadm -m node -T iqn.2020-0930:disk2 -p 172.16.176.100:3260 --op update -n node.startup -v automatic
[root@host103 by-id]#

• LVM逻辑卷

# pvcreate /dev/sdb
# vgcreate vg-100 /dev/sdb
# lvcreate -L 75G vg-100 -100
--格式化#只需要格式化一次（共享主机间）
mkfs.xfs /dev/vg-100/lvol0
--挂载
mount /dev/vg-100/lvol0 /iscsi_data/
--设置开机自动挂载
vim /etc/fstab
/dev/vg-100/lvol0 /iscsi_data/ defaults,_netdev 0 0

• 其他共享存储主机
• 共享发现
• 映射逻辑卷
• 开机自动映射
• 挂载lvm逻辑卷
• 设置开机自动挂载