Hi guys, just to update you. I tried a 4th time with a brand new 12 TB archive and right after setting up everything and putting some data on it I performed a controlled suspend and restore and so on and yes, it broke again with that terrible messages that it can not mount any more the file system. Then I decided to create only 2TB archives (hard disks) as the slider in the Parallels VM suggests to do. I created 4 x 2TB files, one with persistent size and three expandable. I filled up all hard discs with data and rebooted 5 times (even when writing data to it) and everything runs very stable. So to resume, the Parallels Virtual machine has a problem when the virtual disk is being selected bigger than 2TB. There is (and was) never a problem with the btrfs files system I think. Sorry for bothering you all the time with my bad setup. Thanks a lot for all your help! Chris
