Thanks to all for your kind replies. It sounds like the full install of 8.1 is the recommended way to go. I have already gotten it off the local FTP server over night. Since I have a spare SCSI disk, I will simply clone the current system disk (/ and /boot partitions) to that, and install 8.1 on top of the current installation and see what happens. Fortunately the system disk is really small, only 2 Gb. Everything else is on /raid and /arch, which are an 18 Gb RAID5 array and a 60 Gb RAID1+0 array. These were made using the *new* RAID tools with autodetect and all, so my assumption will be that the 8.1 version will detect those fine, but otherwise leave them alone. My guess is that something will break, but fixing the broken things will be less of an effort than installing an entirely new 8.1 on a blank disk, and then re-install and re-configure all the other applications (like SAMBA, DNS, etc.). Or do you think would this leave too many old 6.4 things around? If the installation totally fails, all I should have to do is to swap the 2Gb system disks. Med venlig hilsen/With kind regards - Henrik Schultz Senior Systems Architect Consultant to Maersk Data AS Tel.: +45 39 10 21 13 Mobile: +45 22 12 24 29 E-mail: hsz@maerskdata.dk