I have rather unusual setup, namely I have two external USB disks connected to old netbook configured in raid1 (mirror). I set it up and it worked well for ~2 days. Today, however, when I turned my NAS on instead one mirror on /dev/md0 I see two degraded ones /dev/md126 and /dev/md127. The same disks are connected to the same USB ports all the time. The only thing which comes to my mind is the fact I was playing with partitions on system disk (not touching the mirror, both disks were disconnected that time) according to the method 4 from http://forums.openmediavault.o…topic.php?f=10&t=192#p734 (but I haven't run "mdadm /dev/md100 --create --force --level=linear --raid-devices=1 /dev/sda3" instruction proposed there to create linear array, I just simply mounted new /dev/sda3 from the Filesytems tab in the UI) - I wonder if that could do something wrong to the raid? Please find below all my current configuration.
- What happened and how to fix it?
- How to prevent this in the future?
mdadm --detail /dev/md/mirror1
mdadm --detail /dev/md126
mdadm --detail /dev/md127
All 3 disks: internal system one and both USB drives are configured
the same way to use minimum power, spin down after 10 minutes and
I'll post filesystems configuration screenshot in another post due to limit of 3 attachments per post.