Don't forget the other benefit of hardware raid is being able to boot from a degraded array.

EG if you use software raid and your grub is on a failed drive, you will have to manually force the BIOS to boot from the other (working) drive or it will just hang on boot.

For this reason it's worth considering having at least your grub loader on a RAID partition that uses the hardware RAID controller, even if the rest of your drives use software RAID. Or being aware of this limitation, and being prepared to manually boot or boot grub from an external device if your raid is degraded.

- Noah

On 26 April 2015 at 14:28, Daniel Jitnah <djitnah@greenwareit.com.au> wrote:

Hi all,

I have a system running on a Linux *software raid* 10 setup on Ubuntu
14.04. This system is running very well.

However for some reasons this system needs to be moved from one
(hardware) host to another host (a HP ML110 G7 Proliant Server). I had
in mind to just take the drives from one machine to another. (The
actual workload is in a VM hosted on a very basic KVM installation. so
as long as I get a base host running, I am happy!)

The HP Proliant though has hardware raid, (and I don't think I can
disable it. The original host does not have raid.)

Q:

Can I install software raid on top of a hardware raid system? if Yes,
how would I set the hardware raid? in effect I need the software raid to
still see 4 hard drives?

Thanks
Daniel.

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