Hard restart required

[Lists <lists@benjamindsmith.com>]

Trying out BTRFS today for the first time after a few false starts with 
three drives configured raid1. I'm using Oracle Linux 6/64 with all 
updates applied on unremarkable hardware. (cast off Dell Core2 desktop, 
2 GB RAM, no known problems) Here's what it looks like:

[root@oracle ~]# btrfs filesystem show
Label: none  uuid: bdaf3d87-f992-4a89-9e2b-41de0b5ff909
     Total devices 3 FS bytes used 448.82MB
     devid    2 size 1.36TB used 167.01GB path /dev/sdc
     devid    3 size 1.82TB used 167.01GB path /dev/sdd
     devid    1 size 931.51GB used 2.02GB path /dev/sdb

It hard locked and required a power-off system restart. Is this 
atypical? Here's what did it, this should be OK?

# mount -U bdaf3d87-f992-4a89-9e2b-41de0b5ff909 /media/btrfs;

UUID should work, right? Why else have a UUID if not? Currently, I'm 
using below in /etc/fstab, but this is not preferred since I'm expecting 
hard disks to come and go in my eventual use case - I'm rather certain 
that /dev/sdc will not be the correct drive to mount at some point:

/dev/sdc    /backups/spfs     btrfs noatime,subvol=spfs,compress    0 0


Thanks,

-Ben