I was trying to install proxmox 4.3 on my server recently and stumbled on that pretty common problem with software RAID ; You cannot configure it directly during the installation process.
To make this new volume usable, we have to go through 3 steps :
- We have to create a raid device
- We must create a valid partition
- And finally create a volume group
Technically, we need first to install mdadm :
apt install mdadm -y
The, in my situation, I will create a RAID 1 for 2 disks :
mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sdb /dev/sdc
And it’s important to save your mdam configuration :
mdadm --detail --scan >> /etc/mdadm/mdadm.conf
/dev/md0 will be your new RAID device.
Then you will have to create a new partition on this RAID device :
mkfs -t xfs -f /dev/md0
Just then follow the instructions and finally do these 2 operations :
pvcreate /dev/md0 vgcreate "main-storage_or_whatever_u_want" /dev/md0
And finally add this new raid array in your storage section in Proxmox(just remember to add it as a lvm volume).