We’re planning for a scheduled downtime on Sunday, August 5 for migrating our database server to new hardware. Open Library will be unavailable for  about 3 hours during 7:00 PM PST – 10:00 PM PST. We’ll post here when the site’s back online.

UPDATE 8:40PM PST: The migration is  complete. Both openlibrary.org and covers.openlibrary.org are back online.