upgrade and migrate

Julie Nishimura <[email protected]>
Newsgroups gmane.comp.db.postgresql.general
Message-ID <BYAPR08MB50145D4B77BBAFDEE7C0726BAC420@BYAPR08MB5014.namprd08.prod.outlook.com> 
Hello, what is the best way to migrate from PostgreSQL 8.3.11 on x86_64-redhat-linux-gnu to PostgreSQL 9.6.16 on x86_64-pc-linux-gnu server, with minimal downtime?
The caveat is the source has about 80 databases overall almost 30 TB. I could migrate the smallest ones (up to 1 tb) using pg_dump and pg_restore, but the largest hot database is almost 17 tb, and I am not sure how to approach this effort in a better and efficient way?

Thank you!
-Julie N
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