"No filesystem could mount root" after adding a second device to fs

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Hi,

after adding a second device to a btrfs filesystem (kernel 2.6.31)
used for root fs, I am getting a "No filesystem could mount root"
message upon reboot. Is the caveat

"btrfsctl -a is used to scan all of the block devices under /dev and
probe for Btrfs volumes. This is required after loading the btrfs
module if you're running with more than one device in a filesystem. "

still true? If yes, is there a technical reason for it - am I wrong to
assume that btrfs could execute the scan upon mount request when the
filesystem requires it for assembling?

Regards,

Leszek 'skolima' Ciesielski
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