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How to disable barriers?

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http://serverfault.com – It seems impossible to disable barriers. I have tried loading the kernel with "mount -o barrier=off", "mount -o barrier=0", "barrier=off" and "barrier=0". The kernel is Atomic Secure Linux 2.6.32 with CentOS 6.2 (now 6.3). Anywhere from 20 min to 4 hr after reboot I get an "kernel: JBD: barrier-based sync failed on vda1-8 - disabling barriers" in /var/log/messages. >cat /etc/fstab /dev/mapper/vg_centos62-lv_root / ext4 grpquota,usrquota,rw 0 1 UUID=bb756d7c-5946-4608-bec5-08411daa875e /boot ext4 defaults 1 2 /dev/mapper/vg_centos62-lv_swap swap (HowTos)