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Backup of Exchange DAG

Posted on 2011-03-03
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Last Modified: 2012-05-11
Hello,

even with all the native protection offered by DAG, we will be continuing to backup Exchange 2010.
We have 3 databases in the DAG and all are active on a single server. The passive member of the DAG only contains passive DBs.

question: if we backup the Active copy using MS recommended method of VSS to truncate logs.
Do we need to do anything to the passive copy for log truncation? What mechanism is in place to allow us to keep the logs on the passive under control, or is that not an issue.
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Question by:Intelli-Po
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MichaelVH earned 250 total points
ID: 35030176
Hi there,

log files in a passive database in a DAG are automatically truncated. However; you can customize the delay for this truncation if you'd like.

For more information, look here:
http://technet.microsoft.com/en-us/library/dd979802.aspx

"TruncationLagTime   This parameter specifies the amount of time that the Microsoft Exchange Replication service should wait before truncating log files that have replayed into a copy of the database. The time period begins after the log has been successfully replayed into the copy of the database. The format for this parameter is (Days.Hours:Minutes:Seconds). The default setting for this value is 0 seconds. The maximum allowable setting for this value is 14 days. The minimum allowable setting is 0 seconds. Setting the value for truncation lag time to 0 turns off log truncation delay."

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