Autarchy of the Private Cave

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    Archive for May, 2011

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

    17th May 2011


    • 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

    Inspired by: Debian Etch RAID guide, serverfault question.
    Read the rest of this entry »


    Posted in *nix, how-to, Software | 6 Comments »

    Using Python in a Java project

    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

    Posted in Links, Movies, Programming, Python | No Comments »