There is a MQTT Endpoint in settings called "RamDiskMode". But I cant find a single Ressource about it, what is it, how does it work? Anyone has an idea?
"settings/Settings/Vrmlogger/RamDiskMode"
asked
What is the "RamDiskMode"?
Moving to modifications
But this link may help.
https://linuxhint.com/create-ramdisk-linux/
Guessing it's a boolean indicator.
Why modification? Its build in from Victron and in each cerboGX by default.
I know what a RamDisk is, but not what Victron is doing with it.
What is stored inside the Ramdisk - and why? Maybe logging is directed tehre to reduce writing to eMMC for duration? Why is it then disabled by default?
Looked at the code and it appears this only affects VRM logging when an error writing to the internal storage or an inserted SD/USB card occurs.
The VRM logging stores records in local storage only until they can be sent to the server. Using a RAM disk for this temporary storage means stored records would be lost on a GX device reboot. So it is only a last ditch effort to maintain records.
Thank you. Any chance to activate this by intend to save eMMC writes or is it only active after the file system is broken?
Currently CerboGX write about 9 GB/Month even with VRM disabled. That calculates to exactly 20 Years of lifetime of the eMMC - no spare time left...
I suspect not. I believe most of the writes are to the VRM cache if the VRM server isn't accessible, for settings updates and to logs. Settings updates MUST be non-volatile or their values would not survive a reboot/crash. Logs are valuable for post-mortem should there be a problem.
VRM cache is moved to an inserted SD card which can then be easily replaced.
I suppose you could mount /data to the SD card also but that takes changes to Venus OS every time the firmware is updated.
