Centos 挂在iSCSI磁盘

[root@localhost /]# yum -y install iscsi-initiator-utils

[root@localhost /]# vim /etc/iscsi/initiatorname.iscsi

[root@localhost /]# systemctl start iscsi
[root@localhost /]# systemctl enable iscsi

Created symlink from /etc/systemd/system/remote-fs.target.wants/iscsi.service to /usr/lib/systemd/system/iscsi.service.
[root@localhost /]# systemctl status iscsi
● iscsi.service - Login and scanning of iSCSI devices
   Loaded: loaded (/usr/lib/systemd/system/iscsi.service; enabled; vendor preset: disabled)
   Active: inactive (dead)
Condition: start condition failed at 四 2022-04-28 21:01:36 CST; 26s ago
     Docs: man:iscsiadm(8)
           man:iscsid(8)

4月 27 16:17:48 localhost.localdomain systemd[1]: Unit iscsi.service cannot ...
4月 27 16:17:48 localhost.localdomain systemd[1]: Unit iscsi.service cannot ...
4月 27 16:20:16 localhost.localdomain systemd[1]: Unit iscsi.service cannot ...
Hint: Some lines were ellipsized, use -l to show in full.

iscsiadm -m discovery -t st -p 10.213.132.24

	```
	iscsiadm -m discovery -t st -p 10.213.132.24
	
	iscsiadm: cannot make connection to 10.213.132.24: Connection refused
	```

iscsiadm -m discovery -t st -p 10.213.132.24  -l

10.213.132.30:3260,2461 iqn.2007-11.com.nimblestorage:nimblegroup-g4f9e7cc0916de8eb
10.213.132.31:3260,2461 iqn.2007-11.com.nimblestorage:nimblegroup-g4f9e7cc0916de8eb
Logging in to [iface: default, target: iqn.2007-11.com.nimblestorage:nimblegroup-g4f9e7cc0916de8eb, portal: 10.213.132.30,3260] (multiple)
Logging in to [iface: default, target: iqn.2007-11.com.nimblestorage:nimblegroup-g4f9e7cc0916de8eb, portal: 10.213.132.31,3260] (multiple)
Login to [iface: default, target: iqn.2007-11.com.nimblestorage:nimblegroup-g4f9e7cc0916de8eb, portal: 10.213.132.30,3260] successful.
Login to [iface: default, target: iqn.2007-11.com.nimblestorage:nimblegroup-g4f9e7cc0916de8eb, portal: 10.213.132.31,3260] successful.

 lsscsi

0:0:66:0]   enclosu HUAWEI   Expander 12Gx16  131   -        
[0:2:0:0]    disk    AVAGO    HW-SAS3508       5.06  /dev/sda 
[0:2:1:0]    disk    AVAGO    HW-SAS3508       5.06  /dev/sdb 
[0:2:2:0]    disk    AVAGO    HW-SAS3508       5.06  /dev/sdc 
[0:2:3:0]    disk    AVAGO    HW-SAS3508       5.06  /dev/sdd 

[15:0:0:0]   disk    Nimble   Server           1.0   /dev/sde 
[16:0:0:0]   disk    Nimble   Server           1.0   /dev/sdf

yum install -y device-mapper-multipath
rpm -qa | grep multipath

device-mapper-multipath-0.4.9-123.el7.x86_64
device-mapper-multipath-libs-0.4.9-123.el7.x86_64

mpathconf --enable

systemctl restart multipathd

defaults {
    user_friendly_names yes
}

设置黑名单列表，示例环境sda、sdb磁盘为系统RAID盘，故而排除

blacklist {

devnode "^sd[a-b]"

}

multipaths {

multipath {

path_grouping_policy    multibus

#path_checker           readsector0

prio                    "random"

path_selector           "round-robin 0"

}

}

devices {

device {

vendor        "vcluster"

product       "12.2.12"

path_checker  readsector0

path_selector "round-robin 0"

failback      immediate

no_path_retry fail

}

systemctl restart multipathd

multipath -F

 *multipath -ll*

fdisk -l

Disk /dev/mapper/mpatha: 10995.1 GB, 10995116277760 bytes, 21474836480 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

mkfs -t ext4 /dev/mapper/mpatha

mkdir  /data
mount  /dev/mapper/mpatha   /data
df -h

echo '/dev/mapper/mpatha  /data ext4       defaults        0 0' >> /etc/fstab

mount -a

df -h