Peter, I think there should be no problem with writing to 7 different RRD files with different resolution. I don't know Cacti very well but I think it's possible to create a graph with data from several RRD files, so this shouldn't be a problem. Or just one RRD file with 7 input variables and 7 RRAs corresponding to all your sampling resolutions and CF LAST aggregation (rrdupdate it every 15 minutes, just repeat previous values for percentiles that change less often) All in all, I think rrdupdate should do the job without having to dump/restore anything (but I never did anything similar with rrd) R
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