Build a RAID6 LVM volume, then test failure and replacement of one (or two) of the drives
While learning about different RAID levels and their configurations, I wanted to mess with the RAID abilities of the Linux Logical Volume Manager (LVM), in my case using the Debian lvm2 package in SparkyLinux on a virtual machine setup using VirtualBox.
Long stories short: How I made a "VR" stereoscopic 3D SBS (side-by-side) movie from pictures and videos taken with a Fuji FinePix REAL 3D W3. The article contains more or less reproducible steps, also as a reminder for myself when I try the same thing next time.
While moving some legacy web apps from a real Windows server (headed for retirement, to be somewhat euphemestic about it) to a virtual machine, I encountered the need to make back-ups of this whole VM - for the sake of simplicity, copying / compressing the whole disk images and the virtual machine definition file. Now here comes the issue: Churn on the VDI hard disk causes it to become bigger than necessary, and now I'm trying to reduce it back to the max.
Setting up a virtual development host on ubuntu 15.10 today... - http://www.unixmen.com/setup-apache-virtual-hosts-on-ubuntu-15-10/ .
What do they do - beyond or different from what the Carl Benz Academy has been doing so far?