RRD_HWREAPPLY(1) rrdman RRD_HWREAPPLY(1)NAMErrd_hwreapply - Re-apply Holt-Winters prediction parameters to RRD data
SYNOPSISrrd_hwreapply in.rrd out.rrd [--force] [--start=start] [--delta=scale-
value] [--deltapos=scale-value] [--deltaneg=scale-value] [--fail‐
ure-threshold=failure-threshold] [--window-length=window-length]
[--alpha=adaption-parameter] [--beta=adaption-parameter] [--gamma=adap‐
tion-parameter] [--gamma-deviation=adaption-parameter] [--rralen=rows]
[--season=rows] [--defaults]
DESCRIPTION
The prorgam takes the input RRD, and copies all data to the output RRD,
with new Holt-Winters prediction parameters applied. If the input file
is not Holt-Winters enabled, all parameters must be specified, or use
the --defaults option.
The resulting RRD will not contain exactly the same data as the source
file. It is a result of numerous transformations during the data
fetching and storing. However, the tests have shown quite good results:
for a counter with average values of order of 1e+06, the resulting data
relative difference is of order of 1e-10. For a counter with average
values at the level of 1e+03, the precision is approximately 1e-08.
OPTIONS--force
Forces the output file to be overwritten. Otherwise the program
terminates if the output file already presents.
--start=start
Specifies the earliest date to copy the data for. If not specified,
the earliest available data with one-step (no consolidation) AVER‐
AGE RRAs will be taken.
--delta=scale-value, --deltapos=scale-value, --deltaneg=scale-value,
--failure-threshold=failure-threshold, --window-length=window-length,
--alpha=adaption-parameter, --beta=adaption-parameter, --gamma=adap‐
tion-parameter, --gamma-deviation=adaption-parameter
Set the Holt-Winters algorithm parameters. See rrdtune(1) and the
article of Jake Brutlag on Aberrant Behavior Detection.
--rralen=rows
Set the length of HWPREDICT RRA. Default is 4032 (2 weeks of
5-minute samples).
--season=rows
Set the length of SEASONAL RRA. Default is 288 (1 day of 5-minute
samples).
--defaults
Use the default values for all Holt-Winters parameters. Individual
parameters may be overwritten by the above options. The default
values are:
delta = 2
alpha = 0.1
beta = 0.0035
gamma = 0.1
window_length = 9
failure_threshold = 6
hw_rra_length = 4032
seasonal_period = 288
RESTRICTIONS
This program requires RRDtool version 1.1.x (currently available as
development snapshot only), Perl version 5.8.2 (version 5.8.0 is known
to have bugs which break this utility).
NOTES
RRDman is a set of utilities that manipulate the RRDtool database
files.
AUTHOR
Stanislav Sinyagin <ssinyagin@yahoo.com>
rrdman 1.0.1 2004-05-16 RRD_HWREAPPLY(1)
