tunefs superblock changes fail to stick

I am attempting to do the following

- add ACL support to /dev/mirror/rootfsa
- change optimization preference on /dev/mirror/rootfsa

Code:
#tunefs -p /dev/mirror/rootfsa
tunefs: ACLs: (-a)                                         disabled
tunefs: MAC multilabel: (-l)                               disabled
tunefs: soft updates: (-n)                                 enabled
tunefs: gjournal: (-J)                                     disabled
tunefs: maximum blocks per file in a cylinder group: (-e)  2048
tunefs: average file size: (-f)                            16384
tunefs: average number of files in a directory: (-s)       64
tunefs: minimum percentage of free space: (-m)             8%
tunefs: optimization preference: (-o)                      time
tunefs: volume label: (-L)


Code:
#gmirror status
         Name    Status  Components
mirror/rootfs  COMPLETE  ada0s1
                         ada1s1
                         ada2s1
                         ada3s1
                         ada4s1


I have tried booting into single user mode and doing the following:

# tunefs -a enable /dev/gmirror/rootfsa

I receive a message that it was successful. I then check tunefs -p and it shows ACLs as enabled. Then, I mount the volume read/write and it vanishes. tunefs -p now shows it as disabled. The same problem occurs with volume optimization.

I am running FreeBSD 8.0 - Stable (amd64) synced last night and compiled overnight.

Any help would be greatly appreciated. Thanks!
 
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