When you move a mailbox from Microsoft Exchange Server 2007 to Exchange Server 2013, the migration process much slower than expected.
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.
To fix this issue, install Cumulative Update 11 for Exchange Server 2013.
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
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.