1. Find the directory where your RRDs are stored
2. Stop the poller
3. Create a tmpfs large enough to hold them, with some buffer. (tmpfs will grow as-needed)
4. Rsync your rrds to a safe spot 
5. Mount the tmpfs
6. Rsync your rrds to the tmpfs (watch your memory!)
7. Turn on the poller
8. Set up a cronjob to rsync the rrds to the safe spot every X often
9. Add a script to, at boot, rsync the rrds from the safe spot to tmpfs
10. Drink Beer