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RRD_HWREAPPLY(1) rrdman RRD_HWREAPPLY(1) NAME rrd_hwreapply - Re-apply Holt-Winters prediction parameters to RRD data SYNOPSIS rrd_hwreapply in.rrd out.rrd [--force] [--start=start] [--delta=scale- value] [--deltapos=scale-value] [--deltaneg=scale-value] [--failure-thresh- old=failure-threshold] [--window-length=window-length] [--alpha=adaption- parameter] [--beta=adaption-parameter] [--gamma=adaption-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 termi- nates 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) AVERAGE RRAs will be taken. --delta=scale-value, --deltapos=scale-value, --deltaneg=scale-value, --failure-threshold=failure-threshold, --window-length=window-length, --al- pha=adaption-parameter, --beta=adaption-parameter, --gamma=adaption-parame- ter, --gamma-deviation=adaption-parameter Set the Holt-Winters algorithm parameters. See rrdtune(1) and the arti- cle 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 sam- ples). --defaults Use the default values for all Holt-Winters parameters. Individual pa- rameters 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 devel- opment 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)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | RESTRICTIONS | NOTES | AUTHOR
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