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Exchange 2013 shadow redundancy

Posted on 2015-02-03
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Last Modified: 2015-03-26
Hi,

In my dual node exchange 2013 DAG I'm seeing Shadow redundancy queue is high at about 300 items on average. On the weekends it drops to about 150. These are the spam emails rejected by anti-spam software.

 I changed safety net hold time to one day (Set-TransportConfig -SafetyNetHoldTime 1.0:0:0) expecting to have queue size drop twice but it had no effect.

Any one knows if this can be lowered or eradicated entirely?

Thank you
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Question by:pomah1
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Will Szymkowski earned 500 total points
ID: 40587736
Shadow Redundancy is different than the Safety Net. The Safety Net is a new term which replaced the "transport dumpster" in previous verison. You can check your Shadow Redundancy settings using the following command...

Get-TransportConfig | fl *shadow*

This will provide all of the settings for Shadow Redundancy. AutoDiscardInterval is set to 2 days. You can also Disbale Shadow Redundancy temporarily for testing as well.

Set-TransportConfig -ShadowRedundancyEnabled $False

Will.
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by:pomah1
ID: 40592572
I ran into this https://technet.microsoft.com/en-us/library/dd351046%28v=exchg.141%29.aspx
and decreased discard interval to 1 day. Queue size was cut in half immediately.

what effects will it have on the system if I disable shadow redundancy permanently?

Thank you
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