[rrd-users] ERROR: could not lock RRD

[Laghate, Prasanna]

Just starting to try out rrdtool. Had some questions regarding it:

1. Why does this work?
bash-2.05b$ rrdtool create mem.rrd --start 1074477204 --step 86400
DS:mem:GAUGE:86400:U:U RRA:AVERAGE:0.5:1:7
bash-2.05b$ rrdtool update mem.rrd 1074563604:169.877 1074650004:172.343
1074736404:170.233
bash-2.05b$ rrdtool fetch mem.rrd AVERAGE --start 1074477204 --end
1075168404                       mem
 
 1074470400: nan
 1074556800: 1.6987700000e+02
 1074643200: 1.7214880250e+02
 1074729600: 1.7039916250e+02

and this doesnt?
bash-2.05b$ rrdtool create test.rrd --start 920804400
DS:speed:COUNTER:600:U:U RRA:AVERAGE:0.5:1:24 RRA:AVERAGE:0.5:6:10
bash-2.05b$ rrdtool update test.rrd 920804700:12345 920805000:12357
920805300:12363
ERROR: could not lock RRD

2. Cant we update multiple DS's in different rrd's at the same time? Is
there a global lock?

3. Also, does rrdtool log more detailed errors anywhere?

Thanks,
Prasanna

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