mdadm 删除 软件 RAID

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1，查看

# mdadm -D /dev/md0
/dev/md0:Version : 1.2Creation Time : Sun Sep 20 16:28:18 2020Raid Level : raid0Array Size : 62511153152 (59615.28 GiB 64011.42 GB)Raid Devices : 8Total Devices : 8Persistence : Superblock is persistentUpdate Time : Sun Sep 20 16:28:18 2020State : cleanActive Devices : 8Working Devices : 8Failed Devices : 0Spare Devices : 0Chunk Size : 512KConsistency Policy : noneName : ubuntu-server:0UUID : 6800c526:128831d0:fd0d9f7b:be6faef7Events : 0Number   Major   Minor   RaidDevice State0       8        0        0      active sync   /dev/sda1       8       16        1      active sync   /dev/sdb2       8       32        2      active sync   /dev/sdc3       8       48        3      active sync   /dev/sdd4       8       64        4      active sync   /dev/sde5       8       80        5      active sync   /dev/sdf6       8       96        6      active sync   /dev/sdg7       8      112        7      active sync   /dev/sdh

• raid0

# cat /proc/mdstat
Personalities : [raid0] [linear] [multipath] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid0 sdd[3] sda[0] sdc[2] sdb[1] sdh[7] sdg[6] sde[4] sdf[5]62511153152 blocks super 1.2 512k chunksunused devices: <none>

# cat /etc/mdadm/mdadm.conf
ARRAY /dev/md0 metadata=1.2 name=ubuntu-server:0 UUID=6800c526:128831d0:fd0d9f7b:be6faef7
MAILADDR root

# df -Th
/dev/md0p1     ext4       58T  100K   56T   1% /chain

umount /chain

2，删除

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

# lsblk -o NAME,SIZE,FSTYPE,TYPE,MOUNTPOINT
NAME          SIZE FSTYPE            TYPE MOUNTPOINT
sda           7.3T linux_raid_member disk
sdb           7.3T linux_raid_member disk
sdc           7.3T linux_raid_member disk
sdd           7.3T linux_raid_member disk
sde           7.3T linux_raid_member disk
sdf           7.3T linux_raid_member disk
sdg           7.3T linux_raid_member disk
sdh           7.3T linux_raid_member disk

# cat /etc/mdadm/mdadm.conf
ARRAY /dev/md0 metadata=1.2 name=ubuntu-server:0 UUID=6800c526:128831d0:fd0d9f7b:be6faef7
MAILADDR root
# cat /dev/null > /etc/mdadm/mdadm.conf

• 删除元数据

# mdadm --zero-superblock /dev/sda
# mdadm --zero-superblock /dev/sdb
# mdadm --zero-superblock /dev/sdc
# mdadm --zero-superblock /dev/sdd

# lsblk -o NAME,SIZE,FSTYPE,TYPE,MOUNTPOINT
NAME          SIZE FSTYPE            TYPE MOUNTPOINT
sda           7.3T                   disk
sdb           7.3T                   disk
sdc           7.3T                   disk
sdd           7.3T                   disk
sde           7.3T                   disk
sdf           7.3T linux_raid_member disk
sdg           7.3T linux_raid_member disk
sdh           7.3T linux_raid_member disk

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参考：

1. mdadm彻底删除software RAID

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