You may need to migrate all customers. A twenty-six-hour Friday full migration test day ensures you can.
A IPTV reseller in Sweden spends twenty-six hours on the third Friday of every month testing full customer migration.
He migrates: 10 customers (4 hours), 50 customers (6 hours), 100 customers (8 hours), and 200 customers (8 hours). He measures time, errors, and customer impact.
His Panel IPTV migration process is tested at scale.
A Revendeur IPTV who never tests full migration discovers it takes 3 days when he needs it. His customers experience extended downtime.
Here's what the migration test revealed. A reseller discovered that migrating 100 customers took 12 hours manually. He automated the process. Now it takes 1 hour.
The practical implementation is simple. Block the third Friday of every month, 9 AM-11 AM (next day). "Full Migration Test Day." Test at increasing scales. Optimize your process.
What actually works is writing a migration script. Then migration becomes a button click, not a manual process.
I learned that untested migrations fail. The Twenty-Six Hour Friday Provider Full Customer Migration Test Day tests them.
Honestly, test your full migration this Friday. Your IPTV reseller emergency readiness will improve.