[CentOS] Centos 7 and Software Raid Minimal Install

Wed Jun 1 17:40:20 UTC 2016
Matt <matt.mailinglists at gmail.com>

>> 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?