RRDTool

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RRDTOOL

ERROR: could not lock RRD

Appears due to broken NFS locks

Usually after abnormal network outage between NFS storage server and client system where RRDTOOL works

Fix

mv dbase.rrd dbase.rrd.old

cp dbase.rrd.old dbase.rrd

rm dbase.rrd.old

Another fix

restart both systems