[rrd-users] Re: rrdtool update usage

[Tobias Oetiker]

Yesterday you sent me mail regarding [rrd-users]  rrdtool update usage:

*> Hi,
*> 
*> I have an RRD with 2 columns.  How do I update the first column first,
*> then the second column?  Following the documentation, I tried,
*> 
*> rrdtool update foo.rrd -t col1 953542800:1
*> ... bunch of commands updating col1 ...
*> rrdtool update foo.rrd -t col2 953542800:3
*> ... bunch of commands updating col2 ...
*> 
*> For some reason the updates for col2 don't seem to take, am I missing
*> something here?  

you can only update all the columns at once ... if you drop some
they will go into the update as *UNKNOWN*

cheers
toib
*> 
*> Because each column is extracted from a different file.  This is more
*> natural.  Alternatively, I have tried proprocessing the inputs, so I
*> could do:
*> 
*> rrdtool update foo.rrd 953542800:1:3
*> 
*> This does work.  Could  one shed some light here?  I am using
*> rrdtool-1.0.13-0.6.0 (from rufus.w3.org) with a RedHat 6.1
*> distribution.
*> 
*> Thanks in advance.
*> 
*> Pete
*> 
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