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Today I added a 5th drive in my array, I did the following:

mdadm --add /dev/md0 /dev/sdf1

My drive was added as a spare, I then did:

mdadm --grow /dev/md0 --raid-devices=5

But when I want to check the progress with

watch cat /proc/mdstat

it gets stuck and I can't see what's going on. Meanwhile, I can't access the data wich I assume or hope is normal. Any ideas?

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