Re: arm, both disk able to boot (raid1)
I have a raid1 setup on my ts-209 (from the original install). See my fstab below.
If your raid1 setup is done, just update your fstab and run "update-initramfs -u && flash-kernel" to update the initramfs with the new fstab and install the initramfs to flash. I'd advice you to have a serial console in case something goes wrong.
--- 8< ----
$ cat /etc/fstab
# /etc/fstab: static file system information.
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/md0 / ext3 noatime,errors=remount-ro 0 1
/dev/md2 /home ext3 noatime 0 2
/dev/md1 none swap sw 0 0
none /proc/bus/usb usbfs defaults 0 0
--- >8 ---