Hi All, I'm getting to grips with RRD tool for the first time, but I'm running in to problems getting even a simple example working.
The problem: I have a historical set of data (bytes received per minute) that I wish to "preload" in to an RRDB before providing regular (per minute) updates going forward. I'm using rrdtool 1.2.15 on Cygwin. My datasource has periodic gaps - I'm presuming these gaps will automatically be marked as unknown. C:/cygwin/bin/rrdtool.exe create c:/logmunge.dbt.pacs.com/rrd_db/RC1DBWF01.rrd --start 1199967600 --step 60 DS:bytes:ABSOLUTE:600:U:U RRA:LAST:0.5:1:600 How I interpret this: "Create a new RRD database storing times from Thu, 10 Jan 2008 12:20:00 GMT. Records are added every 60 seconds. There is a single datasource called "bytes", consisting of a ABSOLUTE datasource, that is each record is counted from 0, and is not dependant on the last. If no data is received in 600 seconds, mark it as "unknown". Create 1 round robin archive, consisting of the LAST value (As we guarantee only a single update in a minute), and xff of 0.5, and with PDP calculated from a single update. Store 600 rows (10hr 1min)." (RRD File Created) Add a single record: C:/cygwin/bin/rrdtool.exe updatev c:/logmunge.dbt.pacs.com/www/../rrd_db/RC1DBWF01.rrd -t bytes "1199967601:1432694" $ rrdtool.exe info ../rrd_db/RC1DBWF01.rrd filename = "../rrd_db/RC1DBWF01.rrd" rrd_version = "0003" step = 60 last_update = 1199967601 ds[bytes].type = "ABSOLUTE" ds[bytes].minimal_heartbeat = 600 ds[bytes].min = NaN ds[bytes].max = NaN ds[bytes].last_ds = "UNKN" ds[bytes].value = 1.4326940000e+06 <<< VALUE ADDED ds[bytes].unknown_sec = 0 rra[0].cf = "LAST" rra[0].rows = 600 rra[0].pdp_per_row = 1 rra[0].xff = 5.0000000000e-01 rra[0].cdp_prep[0].value = NaN rra[0].cdp_prep[0].unknown_datapoints = 0 Immediately add another record for 23 minutes later: C:/cygwin/bin/rrdtool.exe update c:/logmunge.dbt.pacs.com/www/../rrd_db/RC1DBWF01.rrd -t bytes "1199968981:5990214" $ rrdtool.exe info ../rrd_db/RC1DBWF01.rrd filename = "../rrd_db/RC1DBWF01.rrd" rrd_version = "0003" step = 60 last_update = 1199968981 ds[bytes].type = "ABSOLUTE" ds[bytes].minimal_heartbeat = 600 ds[bytes].min = NaN ds[bytes].max = NaN ds[bytes].last_ds = "UNKN" ds[bytes].value = NaN <<< Why is this NaN??? ds[bytes].unknown_sec = 1 rra[0].cf = "AVERAGE" rra[0].rows = 600 rra[0].pdp_per_row = 1 rra[0].xff = 5.0000000000e-01 rra[0].cdp_prep[0].value = NaN rra[0].cdp_prep[0].unknown_datapoints = 0 Why is this value marked as unknown? I'm itching to generate a graph but don't seem to be able to get my head around the basics - What am I missing? Any help gratefully received! Kind Regards, Neil Saunders.
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