Toyebox

Hey all (dev team and others!), Thanks in advance for any help you may provide! First off, I am a long time hardware raid user.. This is the first time i have ever migrated to any sort of software based storage pools. So far i love it! Have a couple questions i couldn't find though. Maybe yall can help me! So i currently have a small pool with five 2TB drives with duplication enabled (x2). I am trying to figure out what would happen if i move up close to the 9TB pool storage cap and i lose a drive. Let me rephrase... Lets say I have a failing drive and i want to remove it.. does it take all the current files and move them to the other hard drives? What if there is not enough space? On that note.. Is the duplication process a parity type with multiple pieces spread among all drives? Sorry for the jumble of questions.. Just trying to figure what will happen when i come close to my pool limit and i get a drive failure is all. Thanks!! Matthew