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Q:mdadm created RAID10 became /dev/md127 after a reboot

ATaelMar 30 2017 — edited May 18 2017

Hello,

on my compute instance (Linux <hostname>.localdomain 4.1.12-61.1.28.el6uek.x86_64 #2 SMP Thu Feb 23 20:03:53 PST 2017 x86_64 x86_64 x86_64 GNU/Linux) I created a RAID 10 device as follows:

1. For four NVMe drives:

parted /dev/nvme[0-3]n1

mklabel gpt

mkpart primary 0% 1005

2. Created a RAID 10 device

mdadm --create /dev/md0 --level=10 --raid-devices=4 /dev/nvme[0-3]n1p1

3. Added configuration to mdadm.conf:

mdadm –-detail –-scan | sudo tee –a /etc/mdadm.conf >> /dev/null

4. Created a partion on /dev/md0

parted /dev/md0

mklabel gpt

mkpart primary 0% 100%

5. Created a filesystem

mkfs.ext4 /dev/md0p1

6. Mounted a filesystem to a known directory

mount /dev/md0p1 /u01

7. Added the filesystem and device to /etc/fstab

/dev/md0p1 /u01 ext4 defaults 1 2

I rebooted the machine to test it and /u01 wasn't mounted and /dev/md0 wasn't there either. I've found a device called /dev/md127 that is my RAID10 device. How would I use it without detroying data and why did this happen and finally how can I prevent it from happening again?

Thanks

Andy

This post has been answered by ATael on May 18 2017

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Added on Mar 30 2017

#cloud-applications, #cloud-infrastructure, #compute

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