Martin T wrote:
>I'm sure it's showing zeros- when the network outage started, HDD
>temperature value went from previous value directly to zero. If I had
>a network outage and server was unreachable to a machine where
>rrdtools runs, following data was written to RRD:
>
># rrdtool fetch HDD.rrd AVERAGE -s 1307061000 -e 1307075400
> HDD
>
>1307061600: 2.8986899863e+01
>1307062800: 0.0000000000e+00
>1307064000: 0.0000000000e+00
>1307065200: 0.0000000000e+00
>1307066400: 0.0000000000e+00
>1307067600: 0.0000000000e+00
>1307068800: 0.0000000000e+00
>1307070000: 0.0000000000e+00
>1307071200: 0.0000000000e+00
>1307072400: 0.0000000000e+00
>1307073600: 0.0000000000e+00
>1307074800: 1.0011661112e+01
>1307076000: 3.3748035371e+01
Yes, it's storing zeros.
>If any additional information is needed, please ask!
>
>Am I correct, that in my case there are zeros written to the RRD in
>case of UNKNOWN value? If yes, how to change this behavior?
No, I can assure you that if you write unknown (or don't update at
all) then you'll get unknown.
So I'll refer you to a question I asked earlier :
> > Are you sure you are writing unknowns and not zeroes to the database
> > OR are not writing anything ?
I suggest you need to look at your script and see what it's doing. My
guess is that you are not correctly handing a lack of response - I
think you must use the value "U" and not just an empty string. One
useful technique is to add debugging statements and write data to a
text file. For example, if your script had something like this :
rrdtool update "${db_file}" "${timestamp}:${value}"
then you coould change that to :
rrdtool update "${db_file}" "${timestamp}:${value}"
echo rrdtool update "${db_file}" "${timestamp}:${value}" >> "${debugfile}"
Perhaps if you posted the relevant bits of your script ?
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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