I also had a double disk failure on my Hetzner server quite recently. The server didn't respond, and when I hardware reset it began rebuilding the RAID, but it

I also had a double disk failure on my Hetzner server quite recently. The server didn't respond, and when I hardware reset it began rebuilding the RAID, but it didn't say which disk failed. It happened again very shortly. Hetzner changed the cables and it has now been a month without any issues. After the disk failures, however, some of the virtual images I had on there had trouble booting. They were complaining about bad blocks. After running fsck they ran again. The whole experience made me realize that I really need to run on a filesystem with checksumming. Just plain RAID-1 only helps for a limited subset of errors, and only if it is able to detect which disk failed correctly.