Hello
I also see a similar behavior to @seti running this on a VM platform connected to a SAN, and RRDcached creates severe IO so much so the box is nearly unusable at times. System load averages were high as a result of the system waiting. In-fact I think this caused the gaps in the graphs I’ve been previously experiencing.
After RRDcached is turned off, atop and iotop shows my disk going down from 110% to 2% and everything is back to being responsive.
I think to be running RRDcached it really needs to be on a standalone server with a local disk.Though according to the RRDcached website there is a strange mention of IO.
The daemon was written with big setups in mind. Those setups usually run into IO related problems sooner or later for reasons that are beyond the scope of this document.
I can provide some screenshots if anyone’s interested.
laf i will look into your suggestion and thanks for fixing my last problem!