Originally posted by Aquatic
OK I'm ready to make the jump.
However when I was cloning with CCC, I got a message about .hotfiles.btree can't be copied. Is that a problem?
I don't think so. The log of the Migration Assistant lists that file as "excluded" -
Skipping excluded file /.DS_Store
Skipping file which already exists on new system /Library/.localized
Skipping excluded file /.hotfiles.btree
Skipping excluded file /.Spotlight-V100
Probably because the .hotfiles database won't be synched with the new files on the new volume. The .hotfiles file is a list of the disk locations of frequently-used files. Any file less than 20 MB will be auto-defragged and put there if it is frequently used. Files are put in that area because it is the part of the disk that reads the fastest. The Migration Assistant probably doesn't want to assume that the files that are "hot" will necessarily be "hot" (or even exist) on the new volume, so it does not copy that database file.
The output above also explains why the new volume gets Spotlight indexed again - the Migration Assistant does not copy over the Spotlight index (.Spotlight-V100).