rrd error messages

[Steve Holmes]

Greetings,

I am getting a lot of errors in the rrd-status.log file. There are 2 
actually that are appearing at an alarming frequency (and have been for 
quite a while):

2007-05-21 09:42:52 RRD error updating /var/hobbit/data/rrd/client.purdue.edu/disk,export,video.rrd from 128.210.xxx.xxx: unknown consolidation function '^?<F8>'

2007-05-21 09:42:52 RRD error updating /var/hobbit/data/rrd/client.purdue.edu/memory.real.rrd from 128.210.xxx.xxx: illegal
attempt to update using time 1179754972 when last update time is 2146959360 (minimum one second step)

Note that the system time on the hobbit server and on the clients are all 
synchronized with xntpd so the clocks aren't different.

I am also having some trouble with a lot of NAN values in the disk history 
graphs. I'm wondering a) how to fix these errors, and b) if the errors 
have anything to do with not getting good data in the graphs.

Thanks,
Steve 
Holmes