Hallo, Carl,

Du meintest am 20.01.11:

quoted

If you shutdown the system, at the reboot you should "scan" all the
device in order to find the btrfs ones

# find the btrfs device
btrfs device scan

This must be done at every boot?

Yes - this advice is added in the Wiki (?).

If so, where is recommended, in rc.local?

That depends - it has to be done before mounting. And if the device is  
part of the boot partition then you may put the "scan" command into an  
init-ramdisk.

Viele Gruesse!
Helmut