[iforgotpassword]

Made that experience once ca. 2011. I hosted a Minecraft server ona box with raid1.

The "cool" part was that I ran a cronjob that rendered the map to a png file once and hour, and at some point a friend asked why there were holes in the map. Back then, Minecraft stored every 16x16 chunk of the map in an individual gzipped file. When the raid1 decided to read the chunk from the bad drive, it couldn't unzip it. If that happened to the renderer, there was a hole on the map. If that happened to the game server, it would regenerate the chunk, and overwrite the old one on both drives, even the healthy one. Luckily as far a I remember that only happened on random terrain, otherwise someone would have ended up with half their house missing.