We are at the point in our environment where we're ready to start moving existing boxes from SLES11sp4 to SLES12sp2. I've gone back through about a year's worth of threads and it seems that it can be problematic at best. I've already run into the libpango error and of course there is the beloved "file system is mounted using kernel name....blah, blah,blah" error.

So what I was wanting to know where your general thoughts on trying to upgrade. Is it worth it? Will I spend the next 5 years dealing with ramifications of this upgrade? Or is it better to simply build a new 12 box from scratch and move the applications/data over to it? Or perhaps you've had ZERO issues with upgrades?