> cd /var/lib/rrdcached/db/pve2-vm/; for i in *; do perl rrdaddsource.pl > $i $i.new readiops:DERIVE:120:0:NaN writeiops:DERIVE:120:0:NaN; mv > $i.new $i; done > > rrdaddsource.pl file attached. This could be packaged to run on update. Thanks - I will try that.