Thanks, Todd,

I assume that cleaning metadata means copying all data from the Source to Destination.
And if took offline my Primary DSS (say for hardware maintenance) I will have to make it Destination, then "Clear metadata" on it to force full replication from Secondary to Primary and when the volume is in consistent state, make Secondary a Destination and make Primary a Source and "clean metadata" again for full replication from Primary Source to Secondary Destination once more.

Am I right here or I may skip "clear metadata" somewhere?

Also, when should I clear metadata on Source volume and when on Destination? Or it does not matter and will force full replication anyway?