[CentOS] C7 + UEFI + GPT + RAID1

[Gordon Messmer]

On 03/12/2016 08:22 AM, Alessandro Baggi wrote:
> From several how-to concerning raid1 installation, I must put each 
> partition on a different md devices.

Not necessarily.  You could put LVM on top of the RAID device, and 
create logical volumes.

> I've asked times ago if it's more correct create the md device, 
> partitioning it and create fs on each partition created on md device:

Partitionable RAID devices are supported by Linux, but not by the 
Anaconda installer.  You're better off not using them.

> I'm installing C7 1511 on a skylake machine with UEFI and I'm confused.
> After googling, for my installation I must create gpt table, 1 
> partition with fat32 type of 512M, and 2 partition for swap and / 
> (I've excluded /home), clone gpt partition table on second disk with 
> sgdisk, create md device for swap and /.

Don't clone the partitions.  If you do that, then you also need to 
randomize the UUIDs on the destination drive.  It's probably easier to 
just create the partitions on each disk:

parted -s /dev/sda mklabel gpt \
     mkpart primary ext4 1M 200M \
     mkpart primary ext4 200M 1224M \
     mkpart primary ext4 1224M 100%
parted -s /dev/sdb mklabel gpt \
     mkpart primary ext4 1M 200M \
     mkpart primary ext4 200M 1224M \
     mkpart primary ext4 1224M 100%