Hi all,

Model : hEX (mmips)

Just a quickie. I've set up 'graphing' to see data flows and set the "store every" to 5 minutes and "store to disk" is set ON.

Should I be worried about wear on the flash memory? Maybe I should tone down the settings?

viewtopic.php?p=22012&hilit=memory+wearing#p22028

Unfortunately, in that 17 year old post, @normis just complained about the topic and said it had been previously explained, without any reference to where it is explained, and summarized it as follows.

oh not again the infamous `flash wearing out` topic. it was already explained that this number represents the TOTAL writes per flash, not per sector. even with higher rates, you will be able to live a few years with the flash.

But what type of flash was being used at the time, and its durability compared to what is being produced now I don't know. I also don't know how good the wear leveling in the onboard flash is in the hEX.

I did change mine to
/tool graphing
set store-every=24hours

And it still averaged over 66 sectors written per hour (over the previous 140 hours (5 days 20 hours)
One thing I don't know is if when a "normal" shutdown or reboot is done whether the ram it flushed or not. If the power is just disconnected, it would seem you would lose any data since the last write was done, but my question is if you do a reboot, will you still lose up to a day's worth of samples?

This by @mrz seems to indicate that no extra flush is done on requested reboot.

24h setting means that it will store data every 24hours if your router reboots before that nothing will be stored.
What exactly is not working with 5min?

Does anyone know if a requested reboot (or upgrade or shutdown) flushes the data to disk before shutting off and losing RAM in v7?

I also don't know if there is any hook to link a script to before shutdown is done, or if there is a command to force a write to disk "now" or not.

Hi all,

Model : hEX (mmips)

Just a quickie. I've set up 'graphing' to see data flows and set the "store every" to 5 minutes and "store to disk" is set ON.

Should I be worried about wear on the flash memory? Maybe I should tone down the settings?

I have had a RB2011 setup with graphing of a lot of interfaces for some time and indeed it had accumulated flash errors.
(aside from having flash sectors written counts so high that lots of users on the forum would completely freak out)

24h setting means that it will store data every 24hours if your router reboots before that nothing will be stored.
What exactly is not working with 5min?

Does anyone know if a requested reboot (or upgrade or shutdown) flushes the data to disk before shutting off and losing RAM in v7?

My own experience agrees with quoted text by @mrz ... I don't experience too many blackouts (most devices are on UPSes) but I still get a hole in data now and then. Recently holes became more frequent due to upgrades of ROS v7. But the same happens in v6, requested reboot creates a hole in stats data.

I think it's better to just use Prometheus and Grafana for that (fancier).

Or any external tools Syslog/SNMP

See my signature

I am using 24 hours as a setting, and I'm not seeing holes in my data from reboots.