查看磁盘挂载和Raid信息

[root@host-10-105-36-41 ~]# lsblk 
NAME                     MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                        8:0    0 446.6G  0 disk  
├─sda1                     8:1    0     1G  0 part  /boot/efi
├─sda2                     8:2    0     1G  0 part  /boot
├─sda3                     8:3    0   200G  0 part  
│ ├─centos-root          253:0    0   100G  0 lvm   /
│ └─centos-var           253:1    0 241.3G  0 lvm   /var
└─sda4                     8:4    0 141.3G  0 part  
  └─centos-var           253:1    0 241.3G  0 lvm   /var
nvme0n1                  259:2    0   3.5T  0 disk  
└─md1                    9:127  0   3.5T  0 raid1 
  ├─data-test 253:2    0     2T  0 lvm   /var/lib/test
  ├─data-log       253:3    0     1T  0 lvm   /var/lib/log
  └─data-data            253:5    0   2.9T  0 lvm   /data
nvme1n1                  259:0    0   3.5T  0 disk  
└─md1                    9:127  0   3.5T  0 raid1 
  ├─data-test 253:2    0     2T  0 lvm   /var/lib/test
  ├─data-log       253:3    0     1T  0 lvm   /var/lib/log
  └─data-data            253:5    0   2.9T  0 lvm   /data
nvme2n1                  259:1    0   3.5T  0 disk  
└─md0                    9:126  0   3.5T  0 raid1 
  ├─data-st    253:4    0     1T  0 lvm   /var/lib/st
  └─data-data            253:5    0   2.9T  0 lvm   /data
nvme3n1                  259:3    0   3.5T  0 disk  
└─md0                    9:126  0   3.5T  0 raid1 
  ├─data-st    253:4    0     1T  0 lvm   /var/lib/st
  └─data-data            253:5    0   2.9T  0 lvm   /data
# 可以看出，这里有两个软Raid1

清理Raid信息

# 1.卸载目录
[root@localhost ~]# umount /var/lib/test
[root@localhost ~]# umount /var/lib/log
[root@localhost ~]# umount /data
[root@localhost ~]# umount /var/lib/st
# 2.停止软Raid
[root@localhost ~]# mdadm -S /dev/md0
[root@localhost ~]# mdadm -S /dev/md1
# 3.删除软Raid的配置文件
[root@localhost ~]# echo > /etc/mdadm/mdadm.conf
# 4.清理元数据，注意是每块盘
[root@localhost ~]# mdadm --zero-superblock /dev/nvme0n1
[root@localhost ~]# mdadm --zero-superblock /dev/nvme1n1
[root@localhost ~]# mdadm --zero-superblock /dev/nvme2n1
[root@localhost ~]# mdadm --zero-superblock /dev/nvme3n1
# 5.清除/etc/fstab里面的挂载信息

创建Raid

# 创建raid1
[root@localhost ~]# mdadm --create /dev/md0 --level=1 --raid-devices=2 --spare-devices=0 /dev/nvme0n1 /dev/nvme1n1
# 查看raid的详情
[root@localhost ~]# mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Fri Feb 17 11:05:50 2023
        Raid Level : raid1
        Array Size : 3750606144 (3.49 TiB 3.84 TB)
     Used Dev Size : 3750606144 (3.49 TiB 3.84 TB)
      Raid Devices : 2
     Total Devices : 2
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Thu Mar  9 15:20:36 2023
             State : active 
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : bitmap

              Name : localhost.localdomain:0
              UUID : d8229e82:f16763a3:107d988d:3b5a783a
            Events : 931

    Number   Major   Minor   RaidDevice State
       0     259        2        0      active sync   /dev/nvme0n1
       1     259        0        1      active sync   /dev/nvme1n1