Exchange DAG Logs

[Faridyasin]

Hi , kindly clarify the following : Both Active and Passive node of Exchage Database logs in DAG Environment should be the same for successful backup and remove the logs.

Awaiting your reply !!

[RiaanBadenhorst · Accepted solution]

It means that the replication between your active and passive copies must synchronised/healty/consisten before the logs will be cleared/truncated.

https://msdn.microsoft.com/en-us/library/office/bb204080%28v=exchg.150%29.aspx#bk_interactions

"Backup-initiated transaction log file truncation is triggered based on the type of backup to be performed. In non-DAG configurations, the Exchange writer will truncate the transaction log files at the completion of successful full or incremental backups. In DAG replicated configurations, log truncation will be delayed by the replication service until all necessary log files are replayed into all other copies. The replication service will delete the backed up log files both from the active and the copy log file paths after it verifies that the log files have successfully been applied to the copy database and both active database and the database copies checkpoint has passed the log files to be deleted."

[Faridyasin]

Dear Riaan, Thanks for your prompt reply.let say once we delete logs from either of DAG member(Active/Passive Nodes) to free up Space in case of failure backup so succesfuly backup when possible when both members have to be same numbers of logs.

Kindly Clarify !!