Shutting Down a Robot-Mounted Pi

[viggy96]

Originally Posted by Jared

Please don't give out misleading information on the internet based off of personal experience. The raspberry pi has documented issues that occur when power is cut, and it runs Linux.

The issues is more about hardware than software. The FTL (flash transition layer) will remap storage on the fly as part of its wear leveling feature. If you kill power during a remapping, you pretty much lose the whole disk. This is different from flash storage on something like a roboRIO or a wireless router, which doesn't have that additional layer of abstraction.

Linux does care when its file system is no longer usable.

Originally Posted by Foster

/sigh. No computer system that I've used from mainframes to Raspberry Pi, from MCP to Unix, including Windows and Linux deals well with hard power off when there are IOs in process. You've been lucky.

Lots of people have borked the SD card in a Raspberry Pi. The OP asked a good question, and people are trying to help. Your "whistling in the dark" isn't productive and I predict that someday you will either spend the night hand sewing inodes to restore a file system, or spend most of the day hoping your backup system really works while you boss yells at you about lost orders.

Hmmmm... Let's see, first, was referring purely to the software when I made those statements, not the hardware, and yes you can run into issues dealing with the SD card if the power is suddenly cut, IN SOME CASES. If you have set it up, correctly, and are using it as a vision co-processor, all you are doing is cutting the power while a programme is running. I have done exactly this hundreds, actually thousands, of times, with a Pi B+. I have used it for vision, and just unplugged it to turn it off. Every time, it booted correctly the next time I needed it. Of course, during setup, I made sure to never to that.

So please folks, don't question my intelligence.