Solved Unable to create One Big RAID 10 prior than Centos ?

[Emad R]

Okay here is the scenario, I can ofcourse create this after Centos gets installed, but I want to do it prior, I reckon the superblock can provide all the details and information for the OS.

Using Parted Magic this works 100% and the that OS created the RAID array and was able to see it and mount it correctly everytime.

However with Centos I load up the installer, I switch to terminal prior when I see the installer screen, and I can create successfully RAID devices with the mdadm tool, but Centos installer is not seeing it no matter what.

I was able to mount it under /mnt/raid 10, but I had to create that mountpoint manually, when I do normal mount command it states entry is not found it /etc/fstab and even If i created entry this is live OS session if I rebooted it wont be there ? Also under /mnt I dont see the 4 disks I recall seeing 2 folders system installer and another one.
the devices are under /dev/ folder. I see /dev/sda and /dev/sdb and /dev/sdc/ and /dev/sdd also /dev/md0 which is the RAID i created but it is not allowing me to install on it.

Logically am I doing something wrong trying to do the mdraid prior than the OS ?

The easy way out is install the O.S on its own disk (without RAID) then create RAID with the other drives, but this way I will need 5 storage disks and not 4.

The issue is basically when I go to the Centos installation and click on Disks it shows me the 4 disks separated.

This is not production environment, testing and learning Virtualbox

Thanks in advance.

[scottalanmiller]

Software RAID can never exist until the OS is loaded. So you always have to boot from a non-RAID partition that handled booting.

[Emad R]

@scottalanmiller

I think I got it working with Ubuntu LTS 16.04.2 currently installing the system will see how it goes, however it does make sense that OS needs to be in-charge of this.