Hello,

I'm currently running a PowerDNS setup where I have a hidden primary as well as 
multiple secondaries (spread across multiple countries and datacenters) - I use 
MariaDB as a backend, and all replication is currently done via AXFR.
Roughly 30% of the domains use DNSSEC.

I'm planning on migrating to lmdb eventually as the lightning-stream feature 
becomes available, and then use an S3 backend instead.

However, this obviously means migrating the backends to use lmdb.

Do anyone have any tips/tricks on how to perform this migration with relatively 
low impact? I can block writes to the hidden primary without a problem for 
multiple hours.

Thank you in advance!

Best Regards,
Lucas Rolf 
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