I have a MQTT input node that goes to a gauge type UI visualization. I have no control over the rate the MQTT data comes in, and it comes in really fast (like every 50ms). I'm running Node-Red on a Pi off of SD card.
So my question is:
Is Node-Red logging/saving any of this MQTT data to SD card? Does Node-Red log/write to SD simply because I have a MQTT input node? Or does it write to sd card because of the visualization? I had assumed that chart UI's maybe write to the SD card, but an instantaneous gauge UI might not? But maybe Node-Red does some saving of data in some kind of log just because?
In general, does Node-Red write to SD card? If I'm just subscribing to MQTT topics and performing logic to execute stuff, is all of that writing to SD card? Any way of minimizing SD card writes?
I also have a related question about mosquitto - if the mosquitto server writes to SD card a lot. A lot of my use cases are Mosquitto + Node-Red running off SD card, and I wonder about the longevity of that. Do QoS settings effect SD card writes?