[rrd-users] Combining DS's and LAST

I'm trying to combing a number DS's to display totals. This all works well
for AGV and MAX but LAST always returns nan.

Here's the gist of what I have atm:-

DEF:src1_avg=dbfile1:servers:AVERAGE
DEF:src1_last=dbfile1:servers:LAST
DEF:src1_max=dbfile1:servers:MAX
DEF:src2_avg=dbfile2:servers:AVERAGE
DEF:src2_last=dbfile2:servers:LAST
DEF:src2_max=dbfile2:servers:MAX
....
DEF:srcX_avg=dbfileX:servers:AVERAGE
DEF:srcX_last=dbfileX:servers:LAST
DEF:srcX_max=dbfileX:servers:MAX
CDEF:total_agv=src1_avg,src2_avg,.....,srcX_avg,+, +,....+
CDEF:total_max=src1_max,src2_max,.....,srcX_max,+, +,....+
CDEF:total_last=src1_last,src2_last,.....,srcX_las t,+,+,....+
VDEF:vt_total_last=servers_total_last,LAST
VDEF:vt_total_avg=servers_total_avg,AVERAGE
VDEF:vt_total_max=servers_total_max,MAXIMUM
GPRINT:vt_total_last:%10.0lf
GPRINT:vt_total_avg:%10.0lf
GPRINT:vt_total_max:%10.0lf

I tried checking for undef before doing the sum but that just resulted in
a 0 last instead of nan.

I'm sure this must be possible anyone got any tips?

Regards
Steve

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