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99🗝5qzJWoeEqLK✔ https://m.tb.cn/h.5yascOU HU9046【仅剩2个名额，来淘宝和我一起拼耳温枪6525 3人成团到手价265，倒计时 23: 58: 59】

又折腾了下，的确是少了第二步，把sda2加入m2，成功回复，感谢大佬

我也碰到这个问题，是用了贴吧大佬的方法，还是不行。最后显示是这样，大佬指点下
mdadm -D /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Fri Oct 4 15:10:36 2019
Raid Level : raid1
Array Size : 2490176 (2.37 GiB 2.55 GB)
Used Dev Size : 2490176 (2.37 GiB 2.55 GB)
Raid Devices : 16
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu Dec 7 00:10:28 2023
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1

Rebuild Status : 75% complete

UUID : b21b9baf:243e8b11:3017a5a8:c86610be
Events : 0.7511719

Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 49 1 active sync /dev/sdd1
2 8 33 2 active sync /dev/sdc1
16 8 1 3 spare rebuilding /dev/sda1
- 0 0 4 removed