Your first message says you have the problems on the lv mounted at /mnt/raid.
/dev/raid_vg0/raid_lv0 /mnt/raid ext3 defaults 0 0
then later
I am thinking about reformatting this volume, but /var is on that volume as well.
If you mean that /var is a separate lv in your raid_vg0 volume group, then just umount /mnt/raid and run your fsck on /dev/raid_vg0/raid_lv0.
If you have services that live in or depend on /mnt/raid being mounted, stop all those services first. Or init 1 to single user console.