undomiel wrote: » It depends upon how stale the data on the secondary is. When you do a reload from master the server wipes the zone and does a complete (AXFR) zone transfer from the primary. When you do a reload from master then the server attempts an incremental transfer (IXFR) by checking the SOA and comparing serial numbers. Of course this will tell it that its out of date and needs to update. The primary server then checks its log of incremental updates and transfers over only the changes. That makes transfer a lighter load. This works peachy unless the secondary has been out of commission too long and the logs don't go back that far. Then an AXFR transfer will occur. In that case transfer or reload will both generate about the same amount of traffic. For more info on zone transfers check here: Understanding zones and zone transfer: Domain Name System(DNS)
