Since I found a 256mb microsd around, I decided it was time to migrate my Raspbian install to my USB Drive, but I'm having issues with it.
My setup is a Raspberry Pi 2 with a 64GB SD and a 300GB drive attached, sharing it's contents via a SMB share.
I start by shrinking the only (NTFS) partition in the USB disk and then moving the ext4 partition from my main 64GB SD card to the USB disk. I then edit the fstab file, delete the /dev/mmcblk0p2 mounting on / and switch it for my new partition (the ext4 I copied from the 64GB SD card to the USB disk)
Then I prepared the 256mb SD with the boot partition and edited the cmdline.txt file so that the part where it says "root=" points to the ext4 partition I copied from the 64GB SD to the USB disk.
Now this is where the problems start. When I boot the Pi, it boots correctly from my ext4 partition copied from the 64GB SD to the USB Disk, but it simply doesn't read my modified /etc/network/interfaces file and instead fetches an IP address from DHCP (it's configured to a static address). Any clues on what's happening here? Did I do anything wrong?
(Besides this, my Samba share obviously doesn't work anymore. Is there any tutorial that points me in the right direction regarding changing the target for the share, or should I configure my share all over again?)