I've followed this procedure for my TS-451DeU and two M2 SSDs in RAID1 used for system disk (it's too much and I want one for SSD cache). However in the end of procedure RAID1 works well with first SSD, but second SSD is marked as Faulty, and thus not available for system. Have tried to clear the superblock, but no result.
What I can do, preferrably without removing this M2 SSD? P.S. I think it is possible with creation of another one one-disk RAID1 on this faulty disk and later destroying it, but I am not sure that it is good idea. A command that I plan to this:
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mdadm --create --assume-clean --level=1 --force --raid-devices=1 /dev/mdX /dev/sdXY