Using the SLES SP3 DVD to upgrade an OES (nothing) server the installation cannot find the root partition. Showing all it shows evms partitons as well as the normal (LVM?) but whichever I choose I get errors.

The errors seem to be that it can't find the disk id. I have previously upgraded an identical server but via SP1 and I didn't have this problem during installation. However I do remember an issue caused because the SCSI device IDs changed formats at some stage in the process. Might this be a cause of my problem? And if so can I just change fstab so that it doesn't refer to the root partition by-id?