If you are planning to use the library with iCloud Photo Library, the drive must be formatted MacOS Extended (Journaled). Photos may have problems accessing the drive, if it is on a network volume and not locally mounted.
Prepare the volume: If your iPhoto Library is not in your Pictures folder, but on an external drive, check the drive for compatibility. 
Repair the permissions, and repair the database.
Prepare the library: Ensure that your iPhoto Library has no issues before the migration. Make a Time Machine backup or a bootable clone. Backup: First of all, as always, when upgrading the system, make a full backup, so you can revert to the previous state. (this link is broken: Updating from iPhoto to Photos for OS X - Apple Support)Īnd: Wayback Machine: How Photos handles content and metadata from iPhoto and Aperture 
Get started with Photos for OS X - Apple Support, also see: Updating from iPhoto to Photos for macOS (archive copy). Your migration from iPhoto to Photos will be smoother, if you take a few precautions.
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