[collectd] how to re-create a single rrd file

[Andreas Schuldei]

So today, i had some filesystem trouble and lost one of my rrd files. i
deleted it and hoped, it would be re-created when collected noticed its
absence.

but woe - it did not come back yet.

i restarted collectd, and the other rrd files are updated. can i do that on
the commandline, manually? these are the rrdtool settings:

<Plugin rrdtool>
        DataDir "/var/lib/collectd/rrd"
        CacheTimeout 120
        CacheFlush 900
        WritesPerSecond 30
        RandomTimeout 20
  RRATimespan 3600
  RRATimespan 86400
  RRATimespan 604800
  RRATimespan 2678400
  RRATimespan 31622400
  RRATimespan 315576000
</Plugin>

btw, can i make those RRATimespans longer? (how? i guess i would need to
dump and re-create the rrd files? any howto anywhere?)
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