openbsd 3.6 and ext2

Hi there,

I need to mount a 2 Terabyte RAID 5 volume formatted as ext2 in openbsd 3.6. I can easily mount it read only by..

$ mount -t ext2fs -r /dev/sd2c /mnt/raid

i can then mount it read/write by issuing...

$ mount -uw /mnt/raid

but how would I mount this volume is /etc/fstab?

when I add a line in /etc/fstab like...

/dev/sd2c /mnt/raid ext2fs rw,nodev,nosuid 1 2

an error is thrown basically saying there are inconsistencies and the device is not labelled as ext2

do i need to run disklabel? what command would add the label ext2 without harming the data on the drive?

any advice welcome

thanks

poncenby