Checked out my local electronics store http://www.oomipood.ee yesterday and got some stuff.
First, a breadboard and some wires. Also got me a soldering iron. Those are just for testing. At least I do not have to twist wires together now.
Then I thought, LED-s are cool for something, right? There is a nice site http://www.ladyada.net/learn/arduino/lesson3.html. So I did get 10 1/4W 1K ohm resistors, and some leds, specifically 2 red, 2 blue and 2 green. 3mm and somewhere near 2000-4000 mcd.
Looking around, I decided to get one plain Arduino Duemilanove. Luckily a local dealer is near so I did place an order on it at 15:48 and made a bank transfer. At 17:03, less than 1.5 hours later I got an e-mail stating that I can get my hands on it around 19 o'clock. After a quick call, I got confirmation, that my transfer had gone through and couple of hours and a small trip later I was a enthusiastic owner of an Arduino Duemilanove.
Great thanks for http://ittgroup.ee/ and Zazou in particular.
Why start playing with Arduino?
For a long time I was looking for a way to get temperature readings from outside of computer case and draw graphs of them. Specially with linux. There are a lot of ready to use temperature readers, but all of them have some flaws.
Booting from cd and no /dev/md devices?
First, correct kernel modules are needed.
modprobe raid1
If configuration uses different raid, then a different raid module should be loaded. Be it a raid 0,5,6 or whatever.
Devices can be made then
mknod /dev/md0 b 9 0
mknod /dev/md1 b 9 1
and so on. As many of them as needed.
From this point on door is open for mdadm create,assemble or whatever is needed.
Creating a device goes like this:
mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda2 /dev/sdc2
