[CentOS] Centos 7 and Software Raid Minimal Install

Wed Jun 1 17:52:15 UTC 2016
m.roth at 5-cent.us <m.roth at 5-cent.us>

Matt wrote:
>>> I am trying to install Centos 7 on a couple 4TB drives with software
>>> raid.  In the Supermicro bios I set UEFI/BIOS boot mode to legacy.  I
>>> am using the Centos 7 minimal install ISO flashed to a USB thumb
>>> drive.
>>> So I do custom drive layout something like this using sda and sdb.
>>> Create /boot as 512 MB XFS raid1 array.
>>> Create SWAP as 32 GB SWAP raid1 array.
>>> Create / on 3.xxx TB XFS raid1 array.
>>> I then get error.
>>> "Your BIOS-based system needs a special partition to boot from a GPT
>>> disk label.  To countinue, please create a 1MiB 'biosboot' type
>>> partition."
>>> I cannot seem to create the biosboot partition so it is mirrored to
>>> both drives for redundancy.  Any ideas how to do this?  I want
>>> everything mirrored to both drives.
>> Yeah, you need to create the 1M partition, preferably the first, and its
>> type, like ext4 or xfs or swap, is, in the dropdown, biosboot.
> Is there a way to get this partition mirrored on both drives?

Using software RAID? Build one drive, then add in the other. You do give
RAID the whole drive....