tune2fs journal_data_writeback is not permanently saved.

[slamp slamp]

hello,

i am running fedora 11 with all the latest updates on LVM on top of md
raid1. i reboot into the live cd and run tune2fs -o
journal_data_writeback on all my lvs modified fstab to mount
data=writeback. rebooted into fedora and all is well. i shutdown and
the next morning i booted my fedora i had errors because the lvs are
back to data=ordered. how is this so? doesn't tune2fs save its changes
to the filesystem?

any help would be appreciated.