Archive for May, 2011

How to remotely convert live 1xHDD/LVM Linux server to 2xHDD RAID1/LVM (GRUB2, GPT)

17th May 2011

Assumptions:

current HDD is /dev/sda, it has a GPT (with bios_grub being /dev/sda1), separate /boot partition (/dev/sda2), and a physical LVM volume (/dev/sda3), where LVM holds all the remaining partitions (root, /home, /srv, …); LVM is properly configured, and system reboots with no problems
your new drive is /dev/sdb, it is identical to /dev/sda, and it comes empty from the manufacturer (this is important! wipe the drive if it is not empty, especially if it used to be a part of another RAID)
your system is Debian or Debian-based; in this exact example I’ve been using Ubuntu Server 10.04
your LVM volume group is named vg0
make sure you understand what each command does before executing it
you do have an external backup of all your important data, and you do understand that the following operations are potentially dangerous to your data integrity

17th May 2011

If you are a Python zealot, and Java doesn’t feel right, but the project you are working on is a Java project – try

Jython – Python for the Java platform, compile your python scripts into Java bytecode
Groovy – not Python, but still a scripting language which compiles to jars