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Resize RAID1 array + add RAID0

made with help of:

https://documentation.suse.com/sles/12-SP4/html/SLES-all/cha-raid-resize.html#sec-raid-resize-decr

https://winitpro.ru/index.php/2020/07/09/parted-upravlenie-razdelami-linux/

Decreasing the Size of the RAID Array to 40Gb

Check
mdadm -D /dev/md4 | grep -e "Array Size" -e "Dev Size"
        Array Size : 898628416 (857.00 GiB 920.20 GB)
     Used Dev Size : 898628416 (857.00 GiB 920.20 GB)
Do

mdadm --grow /dev/md4 -z 41943168

Check changes
mdadm -D /dev/md4 | grep -e "Array Size" -e "Dev Size"
        Array Size : 41943168 (40.00 GiB 42.95 GB)
     Used Dev Size : 41943168 (40.00 GiB 42.95 GB)

Decreasing the Size of 1st partition

Remove 1st disk from /dev/md4

mdadm /dev/md4 --fail /dev/nvme1n1p4 --remove /dev/nvme1n1p4

Resize partition to 50Gb (one command)

parted -a opt /dev/nvme1n1 resizepart 4 90GB

or
Resize partition to 50Gb (inside parted)
parted
(parted) print list
(parted) select /dev/nvme1n1
(parted) resizepart 4 90GB
Warning: Shrinking a partition can cause data loss, are you sure you want to continue?
Yes/No? Yes
Add disk to /dev/md4

mdadm -a /dev/md4 /dev/nvme1n1p4

Waiting until RAID sync

until grep -A1 md4 /proc/mdstat | grep -m 1 "UU"; do grep recovery /proc/mdstat && sleep 10 ; done

or

watch -n 3 cat /proc/mdstat

Decreasing the Size of 2st partition

Remove 2nd disk from /dev/md4

mdadm /dev/md4 --fail /dev/nvme0n1p4 --remove /dev/nvme0n1p4

Resize partition to 50Gb (one command)

parted -a opt /dev/nvme0n1 resizepart 4 90GB

or
Resize partition to 50Gb (inside parted)
parted
(parted) select /dev/nvme0n1
(parted) print list
(parted) resizepart 4 90GB
Warning: Shrinking a partition can cause data loss, are you sure you want to continue?
Yes/No? Yes
Add disk to /dev/md4

mdadm -a /dev/md4 /dev/nvme0n1p4

Waiting until RAID sync

until grep -A1 md4 /proc/mdstat | grep -m 1 "UU"; do grep recovery /proc/mdstat && sleep 10 ; done

or

watch -n 3 cat /proc/mdstat

Creating new partition for /root/ledger

Create partition on 1st disk

parted -a opt /dev/nvme0n1 mkpart primary ext4 90.0GB 100%

Create partition on 2nd disk

parted -a opt /dev/nvme1n1 mkpart primary ext4 90.0GB 100%

Create RAID0

mdadm --create --verbose /dev/md5 --level=0 --raid-devices=2 /dev/nvme0n1p5 /dev/nvme1n1p5

Save RAID config to mdadm.comf

sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf

!!! Comment 2 previous raid configurations !!!
#ARRAY /dev/md2 level=raid1 num-devices=2 devices=/dev/nvme0n1p2,/dev/nvme1n1p2
#ARRAY /dev/md4 level=raid1 num-devices=2 devices=/dev/nvme0n1p4,/dev/nvme1n1p4
ARRAY /dev/md2 metadata=1.0 name=punix:2 UUID=3b5ac19:88798a6:d26c602:b42a1ab
ARRAY /dev/md4 metadata=1.0 name=punix:4 UUID=ae545ef:65a40ca:a6cd140:2cda24a
ARRAY /dev/md5 metadata=1.2 name=D0C3452:5 UUID=cf0f0c2:d7fbb90:0d1b2fc:35aa2ab
Update initramfs

sudo update-initramfs -u

Change /dev/md4 PV size

pvresize /dev/md4 --setphysicalvolumesize 42949804032b

Create RAID0 with LVM /dev/vg01/solana
mkfs.ext4 /dev/md5
pvcreate /dev/md5
vgcreate vg01 /dev/md5
lvcreate -L 1T -n ledger vg01
mkfs.ext4 /dev/vg01/ledger
Save mount info to /etc/fstab
echo '/dev/vg01/ledger /root/ledger   ext4    defaults                0 0' >> /etc/fstab
Mount /root/ledger to RAID0
mkdir -p /root/ledger && mount /dev/vg01/ledger
Making speed test
apt install fio -y
cd /root/ledger
curl -sL yabs.sh | bash -s -- -ig

# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #
#              Yet-Another-Bench-Script              #
#                     v2020-12-29                    #
# https://github.com/masonr/yet-another-bench-script #
# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #

Sun 16 May 2021 10:23:13 AM UTC

Basic System Information:
---------------------------------
Processor  : AMD Ryzen 7 PRO 3700 8-Core Processor
CPU cores  : 16 @ 2202.349 MHz
AES-NI     : ✔ Enabled
VM-x/AMD-V : ✔ Enabled
RAM        : 62.8 GiB
Swap       : 18.6 GiB
Disk       : 1.0 TiB

fio Disk Speed Tests (Mixed R/W 50/50):
---------------------------------
Block Size | 4k            (IOPS) | 64k           (IOPS)
  ------   | ---            ----  | ----           ----
Read       | 772.83 MB/s (193.2k) | 1.42 GB/s    (22.2k)
Write      | 774.87 MB/s (193.7k) | 1.43 GB/s    (22.3k)
Total      | 1.54 GB/s   (386.9k) | 2.85 GB/s    (44.6k)
           |                      |
Block Size | 512k          (IOPS) | 1m            (IOPS)
  ------   | ---            ----  | ----           ----
Read       | 1.51 GB/s     (2.9k) | 1.63 GB/s     (1.5k)
Write      | 1.59 GB/s     (3.1k) | 1.74 GB/s     (1.6k)
Total      | 3.11 GB/s     (6.0k) | 3.37 GB/s     (3.2k)