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Franco Masotti 4 years ago
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title: Fixing the /dev/md127 problem
tags: [parabola, raid, kernel naming, /dev/md127, mdadm]
updated: 2018-10-18 11:00
description: Fixing a RAID array kernel name
A quick *how to* today.
`/dev/md127`. It happened again while I was adding a new RAID array to
replace another one. You have no idea the number of times I had to look on the
Internet on how to fix this problem. It usually take 1/2 hour to get the
correct instructions, and I always tell to myself:
> The solution to this problem is very simple. **I know I will remember how
> to deal with it the next time.**
But this is not the case, hence the reason for writing this post.
The fix is quite simple:
- Get the list of all raid arrays
# mdadm --detail --scan
- Copy the array of interest from previous output. Remove the `name`
variable and append what remains in `/etc/mdadm.conf`. If you have for
ARRAY /dev/md127 metadata=1.2 name=<hostname>:127 UUID=<some_uuid>
just keep
ARRAY /dev/md10 metadata=1.2 UUID=<some_uuid>
Notice how `/dev/md127` changed to `/dev/md10` which is our desired device
kernel name.
- Update the initramfs. In my case, on Parabola GNU/Linux-libre
# mkinitcpio -p linux-libre
# mkinitcpio -p linux-libre-lts
- Reboot and check if the RAID device name is now correct.
All this applies if you use mdadm and a GNU/Linux system.