[rrd-users] Re: DST

On Tue, Mar 29, 2005 at 08:02:45AM -0800, SWATTON, JEANINE wrote:
> Question re: DSTs.
>
> I would like to get data from a socket every 2 seconds (packet data) and
> get the number of packets received every second. Since the packet data
> is available only every 2 seconds, I was planning on getting the 1st set
> of data, and dividing it by 2, then the next 2 seconds, getting that
> data, divide it by 2, then get the difference between the 1st set and
> the 2nd set. Then store that into the database.
>
That is one possibility, but if your interval is not exactly 2s, it will
give you inaccurate results.
> I guess I am not sure what DST to use. If I use COUNTER or GAUGE? I
> believe Counter stores the actual value but the amount has to be > than
> the previous amount stored.
>
COUNTER would be the correct DST to use. The amount has to be
greater _or equal_ the previous amount, and it automatically does the
substraction and division you would otherwise have to do yourself.

hth,
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