We are planning on migrating our existing SQL 2012 servers from current windows servers to new windows servers. Only difference is we are migrating this current instance which is standalone to Clustered SQL instance. [New windows server has been built and SQL is configured as clustered instance]
Therefore we need to migrate on the same SQL2012 and windows 2012 version. Total database sizes on the instances are over 20 TB. And yes this is 24*7.
What all measures should i take or please suggest any action plan for this migration that can help me to kick start the migration process in above scenario?