Howto mdadm¶

lsblk is your best friend

lsblk

we are going to use partitions as base for the raid

create Linux RAID partitions¶

fdisk /dev/nvme0n1

create new GPT disklabel¶

g

create new partion¶

n

change type to Linux RAID¶

t

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repeat for all drives e.g. /dev/nvme0n1 and /dev/nvme1n1

check with lsblk

create Raid¶

mdadm --create /dev/md20 --level=1 --raid-devices=2 /dev/nvme0n1p1 /dev/nvme1n1p1

check with lsblk

create filesystem on Raid¶

mkfs.xfs /dev/md20

update mdadm.conf¶

mdadm --detail --scan

add the ARRAY info in /etc/mdadm.conf
should look similar to this

# JKE 2024-09-17
#ARRAY /dev/md20 metadata=1.2 name=hostXX.example.com:20 UUID=d80d7e3a:833baf6d:a428f02d:6f27f791
ARRAY /dev/md20 UUID=d80d7e3a:833baf6d:a428f02d:6f27f791

assemble raid¶

mdadm --assemble --scan

check raid¶

cat /proc/mdstat

mount raid¶

mkdir /mnt/raid
mount /dev/md20 /mnt/raid/

add mount to fstab¶

add following line to fstab

/dev/md20    /mnt/raid    xfs   defaults   0 0

check notification works¶

mdadm --monitor --scan -1 -t