upgrade and migrate

From: Julie Nishimura <juliezain(at)hotmail(dot)com>
To: "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>, pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: upgrade and migrate
Date: 2019-12-03 22:32:22
Message-ID: BYAPR08MB50145D4B77BBAFDEE7C0726BAC420@BYAPR08MB5014.namprd08.prod.outlook.com
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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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