Cody Lo wrote: > I have RRDTool monitoring for my equipments well, I'm really appreciate > with it. But one thing I don't understand is the the xff of the RRA > while creating it. > > xff The xfiles factor defines what part of a consolidation interval may > be made up from *UNKNOWN* data while the consolidated value is still > regarded as known.
The consolidation interval is the amount of time that each slot in the RRA covers. For instance, if "--step" == 300 and the RRA uses 6 "steps" to build one row, the amount of time is 1800 seconds (30 minutes). xff determines the part of this half hour that may be unknown. > In some of the examples, the value of xff is 0.5, which is likely to > mean 5 minutes. No, it is not. It is a number between 0 and 1 ( 0 <= xff < 1 ) > But how will it behaves when I have this value set to 0. > 1 ? or some other values ? 3 ? Look at it as a percentage. Multiply the number by 100 and you will understand it better I think. 0.5 --> 50% --> half of the intervals used (3 steps * 300 seconds in the example) may be unknown to build one, known, interval (6 steps * 300 seconds). 0.0 --> 0% --> every PDP (look this up on the faq site if needed) must be known in order to build a known CDP (dito). 0.999 --> almost 100% --> a known CDP is built even if there's only one known PDP out of many PDPs. HTH -- __________________________________________________________________ / [EMAIL PROTECTED] [EMAIL PROTECTED] \ | work private | | My employer is capable of speaking therefore I speak only for myself | +----------------------------------------------------------------------+ | Technical questions sent directly to me will be nuked. Use the list. | +----------------------------------------------------------------------+ | http://faq.mrtg.org/ | | http://rrdtool.eu.org --> tutorial | +----------------------------------------------------------------------+ -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
