One VIM1 that has been running Ubuntu for years got some weird problems (impossible to execute some sh files for example). Decided to overwrite EMCC with newer image from a sd-card with Krescue.
The write process started normally, but got slower and slower. When a whole hour was spent, the writing speed was already dropped to 240 bytes per second(1). I canceled the process (about 90% of the image was written).
What could this mean, is the EMMC weared out? There was a constant log file writing going on, during the useful worktime. Can I make some tests to find out?
If it is EMMC problem, could the bad areas be somehow excluded?