From 7a8782f42e2bdaf3dce5542a1253a22b91164450 Mon Sep 17 00:00:00 2001
From: Nicolas <nicolas@nonan.net>
Date: Wed, 13 Dec 2023 22:56:40 +0000
Subject: [PATCH] raid config added (raid 5 with 3 disk)

---
 setup_raid.sh | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 setup_raid.sh

diff --git a/setup_raid.sh b/setup_raid.sh
new file mode 100644
index 0000000..4166063
--- /dev/null
+++ b/setup_raid.sh
@@ -0,0 +1,79 @@
+#!/bin/bash
+
+#sources:
+#https://wiki.archlinux.org/title/bcache
+#https://stackoverflow.com/questions/20797819/command-to-change-the-default-home-directory-of-a-user
+#https://unix.stackexchange.com/questions/156102/optimizing-bcache
+#https://evilpiepirate.org/git/linux-bcache.git/tree/Documentation/bcache.txt
+
+#Block devices
+hdddev0=/dev/sdb
+hdddev1=/dev/sdc
+hdddev2=/dev/sdd
+
+#Name of the raid device:
+devname=/dev/md0
+
+#Name of the mounted raid device:
+mountname=/mnt/raid0
+
+
+partition_settings="start=2048, type=83"
+
+
+set -e
+
+if [ "$EUID" -ne 0 ]; then
+  echo "Please run as root"
+  exit
+fi
+
+read -p "Block devices ${hdddev0}, ${hdddev1} and ${hdddev2} will be wiped, are you sure proceed?" -n 1 -r
+echo
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+  exit
+fi
+
+while [ -b /dev/bcache0 ]; then
+  echo "Canceld, device /dev/bcache0 is allready present"
+  exit
+fi
+
+echo
+echo "Clean disks, remove partition tables... "
+wipefs -a $hdddev0
+wipefs -a $hdddev1
+wipefs -a $hdddev2
+
+echo "Partition disks... "
+echo $partition_settings | sfdisk $hdddev0
+echo $partition_settings | sfdisk $hdddev1
+echo $partition_settings | sfdisk $hdddev2
+
+echo
+echo "Create raid 5... "
+mdadm --create $devname --level=5 --raid-devices=3 ${hdddev0}1 ${hdddev1}1 ${hdddev2}1
+
+
+echo
+echo "Wait until device is ready... "
+while [ ! -b $devname ]; do sleep 1; done
+
+echo
+echo "Format and mount bcache device..."
+mkfs.ext4 $devname
+mkdir $mountname
+mount $devname $mountname
+echo "$devname $mountname ext4 rw 0 0" >> /etc/fstab
+
+echo
+echo "Config default home directory for new users on bcache partition... "
+echo "home path of exising users will not be moved automaticaly"
+mkdir $mountname/home
+echo "#" >> /etc/default/useradd
+echo "# Modifications:" >> /etc/default/useradd
+echo "HOME=$mountname/home" >> /etc/default/useradd
+
+echo
+echo "Setup successfully finished"
+