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Raid 1 sincronization very slow and stop

us flag

I have a Raid 1 software in Ubuntu 22.04.1.

One day I saw that I had two raids instead of one: md0 and md127, and that both had one disk. Then I looked for which of the raid was the main one, turned off the computer, removed the disk from the wrong raid (the md127) and added the hard disk to the old raid. Everything was fine and it synchronized fine.... until it gets to 51.2%... then it starts to slow down the sync speed until it gets to 0K/sec:

~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] [raid10] [raid6] [raid5] [raid4] [raid10 
md0 : active raid1 sda1[1] sdb[2]
      4883603456 blocks super 1.2 [2/1] [_U]
      [==========>..........] recovery = 51.2% (2504214464/4883603456) finish=4538643.5min speed=8K/sec
      bitmap: 6/37 pages [24KB], 65536KB chunk

unused devices: <none>

Some idea?

Thanks

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