多路径的配置

server configure:
install target service:
yum -y install targetd targetcli 
 
systemctl start target 
systemctl status target 

systemctl enable target 
systemctl status target 

entry targetcli:
targetcli
create block:
create name=disk1 dev=/dev/sdb 
create name=disk2 dev=/dev/sdc
create name=disk3 dev=/dev/sdd
create name=disk4 dev=/dev/sde
create name=disk5 dev=/dev/sdf

create iqn:
cd /iscsi
create iqn.2023-04.com.xxbj:racdisk

create lun:
cd luns
create lun=lun1 storage_object=/backstores/block/disk1 
create lun=lun2 storage_object=/backstores/block/disk2 
create lun=lun3 storage_object=/backstores/block/disk3 
create lun=lun4 storage_object=/backstores/block/disk4 
create lun=lun5 storage_object=/backstores/block/disk5 

allow access no password:
cd acls 
create wwn=iqn.2023-04.com.xxbj:rac19c1
create wwn=iqn.2023-04.com.xxbj:rac19c2

client configure:
install target client 
yum -y install iscsi-initiator-utils 

systemctl start iscsid.service 
systemclt start iscsi.service 

systemctl enable iscsid.service 
systemclt enable iscsi.service 

two nodes:
vi /etc/iscsi/initiatorname.iscsi 
InitiatorName=iqn.2023-04.com.xxbj:rac19c1

vi /etc/iscsi/initiatorname.iscsi 
InitiatorName=iqn.2023-04.com.xxbj:rac19c2

restart client service:
systemctl restart iscsid.service 
systemctl restart iscsi.service

discovery sharestorage:
iscsiadm -m discovery -t st -p 192.168.20.30

connect to sharestorage:
iscsiadm -m node -T iqn.2023-04.com.xxbj:racdisk -p 192.168.20.30:3260 -l 

lsblk

lsscsi 

connect to storage session:
iscsiadm -m session 

logout connect:
iscsiadm -m node -T iqn.2023-04.com.xxbj:racdisk -p 192.168.20.30:3260 -u 

iscsiadm -m discovery -t st -p 192.168.20.31
iscsiadm -m node -T iqn.2023-04.com.xxbj:racdisk -p 192.168.20.31:3260 -l 

now storage is double 

install multipath
yum install device-mapper-multipath device-mapper -y 

systemctl enable multipathd.service 

generate config files
/sbin/mpathconf --enable 

systemctl start multipathd.service 

cd /etc/multipath 
cat bindings 
will generate bindings, the share storage binding completely.

fdisk -l | grep /dev/mapper