FIX: Mailbox migration from Exchange Server 2007 to Exchange Server 2013 is very slow

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Symptoms

When you move a mailbox from Microsoft Exchange Server 2007 to Exchange Server 2013, the migration process much slower than expected.

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Cause

This issue occurs when Workload Management (WLM) disables the Disk Latency monitor and the last update time is not updated. This throttles the mailbox migration process.

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Resolution

To fix this issue, install Cumulative Update 11 for Exchange Server 2013.

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Workaround

To work around this issue, add an Override for the Disk Latency monitor, as in the following example:

New-SettingOverride EnableDiskLatency -Component WorkloadManagement -Section DiskLatency -Parameters @("Enabled=true","UrgentUnderloaded=10000","UrgentOverloaded=10000","UrgentCritical=10000","CustomerExpectationUnderloaded=10000","CustomerExpectationOverloaded=10000","CustomerExpectationCritical=10000","InternalMaintenanceUnderloaded=10000","InternalMaintenanceOverloaded=10000","InternalMaintenanceCritical=10000","DiscretionaryUnderloaded=10000","DiscretionaryOverloaded=10000","DiscretionaryCritical=10000") -Reason "Enable disk latency throttling as a temporary work around to increase MRS throughput." -MaxVersion 15.1.107

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