I have a large iPhoto library (better part of 0.5TB) that sits on an external thunderbolt RAID array. Is there a way to 'migrate in place' when moving to Photos? I do not want to have Photos to try to migrate it to some default location -- this would require I have enough space for the library to be moved (temporarily) onto my machine's internal drive, then spend all the time necessary to move it back out to the external RAID and re-configure Photos. Even if it migrated it to a 'new place' on the RAID array, that would be much more desirable than having it try to mover everything to an internal drive. I haven't found anything conclusive on this, yet. Thanks for any helpful input!