Issue
Ingesting data into an Exchange Server target can lead to performance issues during the ingest relating to the throttling which is built-in to Microsoft Exchange.
Solution
This article explains how to create and apply an unrestricted policy for an ingest service account. Further, it gives some additional TCP/IP tuning which may be considered (but may also be environment specific)
Run the following cmdlets:
–2010
New-ThrottlingPolicy ASThrottlingPolicy
Set-ThrottlingPolicy ASThrottlingPolicy -RCAMaxConcurrency $null -EWSMaxConcurrency $null -EWSMaxSubscriptions $null -CPAMaxConcurrency $null -MessageRateLimit $null -RecipientRateLimit $null
–2013
New-ThrottlingPolicy ASThrottlingPolicy
Set-ThrottlingPolicy ASThrottlingPolicy -RCAMaxConcurrency Unlimited -RcaMaxBurst Unlimited -RcaRechargeRate Unlimited -RcaCutoffBalance Unlimited -EWSMaxConcurrency Unlimited -EWSMaxSubscriptions Unlimited -CPAMaxConcurrency Unlimited -EwsCutoffBalance Unlimited -EwsMaxBurst Unlimited -EwsRechargeRate Unlimited -MessageRateLimit Unlimited -RecipientRateLimit Unlimited
Set-Mailbox migadmin -ThrottlingPolicy ASThrottlingPolicy
Where ‘MigAdmin’ is the name of your migration admin account.
Netsh int tcp set global RSS=Disabled
Netsh int tcp set global chimney=Disabled
Netsh int tcp set global autotuninglevel=Disabled
Netsh int tcp set global ecncapability=Disabled
Netsh int tcp set global timestamps=Disabled
Netsh int ip set global taskoffload=Disabled
 

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