[EMAIL PROTECTED] wrote:

>   I have, however, considered merging RRDs for other purposes (like creating
> group statistics for a bunch of devices).

Why?

DEF:val1=/path/to/database1.rrd:....
DEF:val2=/otherpath/to/other/xyz.rrd:...
DEF:val3....
....

CDEF:total=val1,val2,val3,.....+,+

>   This may be the hard way, but I think I would dump the RRDs to XML merge 
> them
> that way, and then convert back to RRD.

That will work.  And then you buy a new device and have to do it
all over again.  And again.

HTH
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