[rrd-users] AW: LAST

[Thorsten Volkmer-Wolf]

>Does the CDEF: LAST do anything other than get the last reading of each 
>RRD ?

That would mean for every variable rrdtool would deliver only one (1!) value, regardless of the time you'd want to be graphed. But when creating a graph you specify the starttime and endtime , which means rrdtool has to provide values measured in the past...


Does this make sense?

Regards,
	Thorsten

-----Ursprüngliche Nachricht-----
Von: Steve [mailto:steve at thebloodpack.com]
Gesendet: Montag, 16. Februar 2004 12:47
An: rrd-users at list.ee.ethz.ch
Betreff: [rrd-users] LAST


Hi,

I have run into a problem with aggregating lots of RRD files and getting
a  LAST result. I think I may have corrupted some of my RRD's.

I am creating an aggregate summary graph of lots of switch port inocts 
and outocts.
Using rrdcgi  I am adding up all the ports and creating a single 
agregate switch traffic graph.
This has been working fine up until recently when we had one of our 
switches go bezerk  and
I had to remove some spikes  manually by dumping the rrd's to text and 
removing all the +08's
and +09's from the files.
Now as a result of this the graphs look okay (the AREA is fine) but the 
LAST reading does
not match the AREA ??

Does the CDEF: LAST do anything other than get the last reading of each 
RRD ?
or is there anyway of checking the figures in an RRD are consistent ?


thanks
Steve


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