Internal error while talking to rrdcached

Hi,

I'm getting following error from Zenoss monitoring setup, but the root
cause is unclear.
Possibly you could give some insight or tips where to look at? Already
tried via Zenoss community forum (http://community.zenoss.org/thread/18663)
but no luck there so far.

[Error]
2012-11-02 10:20:32,411 ERROR zen.ThresholdInstance: Unable to read RRD
file for usedBlocks_usedBlocks
Traceback (most recent call last):
  File "/opt/zenoss/Products/ZenModel/ThresholdInstance.py", line 150, in
checkRaw
    cycleTime, rrdType = self._getRRDType(dataPoint)
  File "/opt/zenoss/Products/ZenModel/ThresholdInstance.py", line 173, in
_getRRDType
    data = rrdtool_fn()
  File "/opt/zenoss/Products/ZenUtils/Utils.py", line 1739, in _inner
    return fn(*args,**kwargs)
  File "/opt/zenoss/Products/ZenModel/ThresholdInstance.py", line 172, in
rrdtool_fn
    return rrdtool.info(self.context().path(dp), *rrd_daemon_args())
error: request: internal error while talking to rrdcached

[Process]
zenoss   12303  0.0  0.0 114288  1156 ?        Ssl  10:06   0:00
/usr/bin/rrdcached -b /opt/zenoss/perf -p /opt/zenoss/var/rrdcached.pid -l
/opt/zenoss/var/rrdcached.sock -j /opt/zenoss/var/rrd_journals


Is there any (rrdcached?) command that I could run/tryout test whether the
problem really is in rrdtool/rrdcached ?

Br,
Juha

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