Negative values on a graph?
Hi,
I'm using a custom monitor to graph a value that can drop below zero. The value returned is in tenths-of-units, so I put "/10" on the end of OID I'm querying.
Whilst this value is positive, I get the desired result of OIDValue/10. When the value goes negative, I get (32768 + (OIDValue/10)) instead. For example, if the polled value is -50, I get 32763 shown in the table and the graph.
I don't know how these values are stored within OpManager, but it looks like it might be some kind of signed/unsigned mismatch on a 16-bit numeric data type?
32763 in binary is 0111 1111 1111 1011
-5 in binary is 1111 1111 1111 1011
??
alec
I'm using a custom monitor to graph a value that can drop below zero. The value returned is in tenths-of-units, so I put "/10" on the end of OID I'm querying.
Whilst this value is positive, I get the desired result of OIDValue/10. When the value goes negative, I get (32768 + (OIDValue/10)) instead. For example, if the polled value is -50, I get 32763 shown in the table and the graph.
I don't know how these values are stored within OpManager, but it looks like it might be some kind of signed/unsigned mismatch on a 16-bit numeric data type?
32763 in binary is 0111 1111 1111 1011
-5 in binary is 1111 1111 1111 1011
??
alec