device with newer data added as spare - data now gone?

[Molinero <marianne@masu.dk>]

Hi all

I've lost quite a lot of data on my /home raid partition and I'm wondering
what exactly I did to make it happen. I'd like to know so something similar
won't happen in the future.

I'm pretty much a raid newbie. I setup raid1 on my home server and I'm
guessing that something like this happened. Please tell me if it's possible.

* Some time ago I did something to have one device fail which resulted md3
in having only 1 device.
* Time went by without me noticing (because I suck)
* An update broke my raid setup and gave me a kernel panic (because I suck).
Didn't put the mdadm and raid hooks in mkinitcpio.conf
* Booted a live-cd, mounted the drives and chrooted back into the system and
fixed the mkinitcpio.conf
* Rebooted and noticed that md3 was running with only 1 device
* Added sdb4 to md3 and it then read 1 device with 1 spare
* cat /proc/mdstat started to say "recovery"
* All data from approx. 1 year is gone

I guessing that the old (not updated) device was set as "master" and the
data on the drive (containing newer data) was overwritten by data on the old
device - is this plausible?

If not what exactly did I do to delete all of the data? 

It's not the end of the world but it does suck a lot - especially some email
and pictures are gone that I will miss.

Any clarifications will be much appreciated.
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