Setting up my 2nd set of Raid drives - HPE Gen10 Plus

[Robert Moskowitz]

This is for my HPE Gen10 Plus.

In the Ubuntu 24 install, I put the boot drive on the Internal USB 
stick, as you will see below.

I set up two Raid groups, messed up and restarted Install.  Only this 
time just creating one Raid group (md0) and setting it up as one big 
ext4 partition.

Now I want to setup the remaining 2 drives as an ext4 partition as 
directory /storage2

The only guide I have so far is:

https://askubuntu.com/questions/1299978/install-ubuntu-20-04-desktop-with-raid-1-and-lvm-on-machine-with-uefi-bios

df -h shows:

Filesystem      Size  Used Avail Use% Mounted on
tmpfs           780M  1.3M  778M   1% /run
efivarfs        494K  125K  365K  26% /sys/firmware/efi/efivars
/dev/md0        3.6T  393G  3.1T  12% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/sdf1       688M  6.2M  682M   1% /boot/efi
tmpfs           780M   12K  780M   1% /run/user/1000

So definitely md0.  But I run cat /proc/mdstat:

Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sdc[1] sda[0]
       3906886464 blocks super 1.2 [2/2] [UU]
       bitmap: 0/30 pages [0KB], 65536KB chunk

md0 : active raid1 sdb[0] sdd[1]
       3906886464 blocks super 1.2 [2/2] [UU]
       bitmap: 0/30 pages [0KB], 65536KB chunk

And somehow, my aborted effort to make that 2nd Raid group stayed in the 
install.  Or so it seems.

But to further confuse me:

# lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINTS
sda             8:0    0  3.6T  0 disk
└─md2           9:2    0  3.6T  0 raid1
   └─vg0-lv--0 252:0    0  3.6T  0 lvm
sdb             8:16   0  3.6T  0 disk
└─md0           9:0    0  3.6T  0 raid1 /
sdc             8:32   0  3.6T  0 disk
└─md2           9:2    0  3.6T  0 raid1
   └─vg0-lv--0 252:0    0  3.6T  0 lvm
sdd             8:48   0  3.6T  0 disk
└─md0           9:0    0  3.6T  0 raid1 /
sde             8:64   0  2.7T  0 disk
└─sde1          8:65   0  2.7T  0 part
sdf             8:80   1 14.5G  0 disk
└─sdf1          8:81   1  689M  0 part  /boot/efi

I did choose lvm in that aborted install for the 2nd Raid group, and it 
seems like that is still there?

I don't think I need lvm, I am open to why I might.  But can someone 
point me to a guide that will get md2 usable as /storage2?

My googling for such a guide has come up empty...

Thanks!

Oh, and I will need to figure out which physical drives are which sd_ so 
if I need to, I will know which to fix.

And I have rsyncd up on this box ready to start receiving backups. But 
no poweron hardware timer, it seems, in the Gen10+, so I will need a 
powerstrip with a timer to turn it on at 1am and a cron job to shutdown 
at 4am...