mdadm使用 移除raid

1，移除软raid

# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : active raid5 sda1[0] sdh1[7](S) sdd1[3] sde1[4] sdf1[5] sdb1[1] sdg1[8] sdc1[2]
      46883358720 blocks super 1.2 level 5, 512k chunk, algorithm 2 [7/7] [UUUUUUU]
      bitmap: 0/59 pages [0KB], 65536KB chunk

# umount /dev/md0

# mdadm --stop /dev/md0
mdadm: stopped /dev/md0

# lsblk -o NAME,SIZE,FSTYPE,TYPE,MOUNTPOINT
sda           7.3T                   disk
└─sda1        7.3T linux_raid_member part
sdb           7.3T                   disk
└─sdb1        7.3T linux_raid_member part
sdc           7.3T                   disk
└─sdc1        7.3T linux_raid_member part
sdd           7.3T                   disk
└─sdd1        7.3T linux_raid_member part
sde           7.3T                   disk
└─sde1        7.3T linux_raid_member part
sdf           7.3T                   disk
└─sdf1        7.3T linux_raid_member part
sdg           7.3T                   disk
└─sdg1        7.3T linux_raid_member part
sdh           7.3T                   disk
└─sdh1        7.3T linux_raid_member part

# mdadm --zero-superblock /dev/sda
mdadm: Unrecognised md component device - /dev/sda

# mdadm --zero-superblock /dev/sdb1

• 取消挂载

# vim /etc/fstab

• 注释

# vim /etc/mdadm/mdadm.conf
# cat mdadm.conf
#ARRAY /dev/md0 level=raid5 num-devices=7 metadata=1.2 spares=2 name=zj:0 UUID=640060ec:39df81b8:abaa1b6f:359672f3
#   devices=/dev/sda1,/dev/sdb1,/dev/sdc1,/dev/sdd1,/dev/sde1,/dev/sdf1,/dev/sdg1,/dev/sdh1

# update-initramfs -u

2，软raid

# mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
        Raid Level : raid0
     Total Devices : 1
       Persistence : Superblock is persistent

             State : inactive
   Working Devices : 1

              Name : zj:0  (local to host zj)
              UUID : 640060ec:39df81b8:abaa1b6f:359672f3
            Events : 56382

    Number   Major   Minor   RaidDevice

       -       8        1        -        /dev/sda1

# mdadm --misc --detail /dev/md0
/dev/md0:
           Version : 1.2
        Raid Level : raid0
     Total Devices : 1
       Persistence : Superblock is persistent

             State : inactive
   Working Devices : 1

              Name : zj:0  (local to host zj)
              UUID : 640060ec:39df81b8:abaa1b6f:359672f3
            Events : 56382

    Number   Major   Minor   RaidDevice

       -       8        1        -        /dev/sda1

# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : inactive sda1[0](S)
      7813893120 blocks super 1.2

unused devices: <none>

# mdadm --misc --stop /dev/md0
mdadm: stopped /dev/md0

# mdadm --misc --zero-superblock /dev/sda1

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参考：

1. 如何在Ubuntu 18.04上使用mdadm创建RAID阵列 重置现有RAID设备
2. Debian/Ubuntu上使用mdadm创建RAID阵列 移除现有RAID设备
3. 使用mdadm设置RAID 关闭RAID
4. mdadm命令详解