Hi, I had a question regarding the update of HW prediction related parameters from rrd_update.
In rrd_hw.c, there is a comment saying that DEVSEASONAL and DEVPREDICT arrays store the same value: line 260: /* there really isn't any "update" here; the only reason this information is stored separately from DEVSEASONAL is to preserve deviation predictions for a longer duration than one seasonal cycle. */ However we see that the values in these two arrays are not exactly the same. The reason we came up on this is that DEVSEASONAL seems to do a better job at storing seasonal trends (based on the values we see) where as DEVPREDICT is the one being used in the confidence band calculation. These are the last 20 values from an rrd file that we have for these two arrays: DEVSEASONAL - last 20 values: <!-- 2006-09-18 13:54:00 EDT / 1158602040 --> <row><v> 6.7479187052e+02 </v></row> <!-- 2006-09-18 13:56:00 EDT / 1158602160 --> <row><v> 6.8014805212e+02 </v></row> <!-- 2006-09-18 13:58:00 EDT / 1158602280 --> <row><v> 7.1526216969e+02 </v></row> <!-- 2006-09-18 14:00:00 EDT / 1158602400 --> <row><v> 7.3048319709e+02 </v></row> <!-- 2006-09-18 14:02:00 EDT / 1158602520 --> <row><v> 6.6526793619e+02 </v></row> <!-- 2006-09-18 14:04:00 EDT / 1158602640 --> <row><v> 6.4740017657e+02 </v></row> <!-- 2006-09-18 14:06:00 EDT / 1158602760 --> <row><v> 6.6632103446e+02 </v></row> <!-- 2006-09-18 14:08:00 EDT / 1158602880 --> <row><v> 6.8383080944e+02 </v></row> <!-- 2006-09-18 14:10:00 EDT / 1158603000 --> <row><v> 6.6914494305e+02 </v></row> <!-- 2006-09-18 14:12:00 EDT / 1158603120 --> <row><v> 6.4563236435e+02 </v></row> <!-- 2006-09-18 14:14:00 EDT / 1158603240 --> <row><v> 7.2319254784e+02 </v></row> <!-- 2006-09-18 14:16:00 EDT / 1158603360 --> <row><v> 6.9837722813e+02 </v></row> <!-- 2006-09-18 14:18:00 EDT / 1158603480 --> <row><v> 6.4696817613e+02 </v></row> <!-- 2006-09-18 14:20:00 EDT / 1158603600 --> <row><v> 6.5821443074e+02 </v></row> <!-- 2006-09-18 14:22:00 EDT / 1158603720 --> <row><v> 6.4258822610e+02 </v></row> <!-- 2006-09-18 14:24:00 EDT / 1158603840 --> <row><v> 6.5186322754e+02 </v></row> <!-- 2006-09-18 14:26:00 EDT / 1158603960 --> <row><v> 6.9563451085e+02 </v></row> <!-- 2006-09-18 14:28:00 EDT / 1158604080 --> <row><v> 6.7803150283e+02 </v></row> <!-- 2006-09-18 14:30:00 EDT / 1158604200 --> <row><v> 6.6917753321e+02 </v></row> <!-- 2006-09-18 14:32:00 EDT / 1158604320 --> <row><v> 6.7315462260e+02 </v></row> <!-- 2006-09-18 14:34:00 EDT / 1158604440 --> <row><v> 6.6018746037e+02 </v></row> DEVPREDICT - last 20 values: <!-- 2006-09-18 13:54:00 EDT / 1158602040 --> <row><v> 7.1795098121e+02 </v></row> <!-- 2006-09-18 13:56:00 EDT / 1158602160 --> <row><v> 7.1730298323e+02 </v></row> <!-- 2006-09-18 13:58:00 EDT / 1158602280 --> <row><v> 7.1663328392e+02 </v></row> <!-- 2006-09-18 14:00:00 EDT / 1158602400 --> <row><v> 7.1594734445e+02 </v></row> <!-- 2006-09-18 14:02:00 EDT / 1158602520 --> <row><v> 7.1552220024e+02 </v></row> <!-- 2006-09-18 14:04:00 EDT / 1158602640 --> <row><v> 7.1504178086e+02 </v></row> <!-- 2006-09-18 14:06:00 EDT / 1158602760 --> <row><v> 7.1448710608e+02 </v></row> <!-- 2006-09-18 14:08:00 EDT / 1158602880 --> <row><v> 7.1419651423e+02 </v></row> <!-- 2006-09-18 14:10:00 EDT / 1158603000 --> <row><v> 7.1372565394e+02 </v></row> <!-- 2006-09-18 14:12:00 EDT / 1158603120 --> <row><v> 7.1292603401e+02 </v></row> <!-- 2006-09-18 14:14:00 EDT / 1158603240 --> <row><v> 7.1222275576e+02 </v></row> <!-- 2006-09-18 14:16:00 EDT / 1158603360 --> <row><v> 7.1202793491e+02 </v></row> <!-- 2006-09-18 14:18:00 EDT / 1158603480 --> <row><v> 7.1165836499e+02 </v></row> <!-- 2006-09-18 14:20:00 EDT / 1158603600 --> <row><v> 7.1089053618e+02 </v></row> <!-- 2006-09-18 14:22:00 EDT / 1158603720 --> <row><v> 7.1039830564e+02 </v></row> <!-- 2006-09-18 14:24:00 EDT / 1158603840 --> <row><v> 7.1003574931e+02 </v></row> <!-- 2006-09-18 14:26:00 EDT / 1158603960 --> <row><v> 7.0927786296e+02 </v></row> <!-- 2006-09-18 14:28:00 EDT / 1158604080 --> <row><v> 7.0859560556e+02 </v></row> <!-- 2006-09-18 14:30:00 EDT / 1158604200 --> <row><v> 7.0823369100e+02 </v></row> <!-- 2006-09-18 14:32:00 EDT / 1158604320 --> <row><v> 7.0692641183e+02 </v></row> <!-- 2006-09-18 14:34:00 EDT / 1158604440 --> <row><v> 7.0558473505e+02 </v></row> Can someone please shed any light on this ? Thanks in advance, Praveen. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-developers WebAdmin http://lists.ee.ethz.ch/lsg2.cgi