We have 3 replica setup in a single datacenter with one primary replica and one sync secondary and one ASYNC secondary. We have just added in 3 more ASYNC secondaries in a different data center. Since doing this we have seen our HADR_SYNC_COMMIT waits increase in both number and duration. My understanding is that these waits are only shown when waiting for the sync replica to send back the acknowledgement that the transaction has been hardened to stable media. So wondering why the increase in this wait just from adding ASYNC secondaries?Any insight would be appreciated.
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