I'm setting up an openBSD 5.6 box with a 4TB raid to back up a video editing cluster. I'll be using BackupPC which likes to have a single large volume so it can de-duplicate files using hard links. Thus the main volume will be all the 4TB.
I know FFS2 can handle that size easily, but I'm worried about fsck taking forever. This machine will have 1.5GB RAM, from what I've read that's not enough memory to fsck a 4TB volume without painful swapping. Is there some filesystem-plus-options for recent OpenBSD that guarantees the disk will always be in a consistent state, even after a crash, so that fsck won't be necessary? (Yes I'll be testing out the RAID before deploying, would like to start with the right filesystem on it from the outset. And yes it will be on a UPS with graceful shutdown. I don't trust myself to get it all right, and bad things still happen...) -y
