Exchange 2010/2013/2016/Office 365 Throttling – CloudM

Problem

Exchange 2010 and above has a low throttling limit and you may see errors or performance issues related to this.

Solution

If using Office 365, you can contact Microsoft and request that the limit for EWSMaxConcurrency is raised to the highest level possible (or removed) for your domain, or setup more admin users to avoid reaching the max concurrency.

You can also disable throttling parameters for the admin account by running the following commands in the Exchange Management Shell, replacing ADMIN with your admin user:

PowerShell Commands

New-ThrottlingPolicy CloudMigratorPolicy
 
Set-ThrottlingPolicy CloudMigratorPolicy -RCAMaxConcurrency $null -RCAPercentTimeInAD $null -RCAPercentTimeInCAS $null -RCAPercentTimeInMailboxRPC $null -EWSMaxConcurrency $null -EWSPercentTimeInAD $null -EWSPercentTimeInCAS $null -EWSPercentTimeInMailboxRPC $null -EWSMaxSubscriptions $null -EWSFastSearchTimeoutInSeconds $null -EWSFindCountLimit $null -CPAMaxConcurrency $null -CPAPercentTimeInCAS $null -CPAPercentTimeInMailboxRPC $null -CPUStartPercent $null 
 
Set-Mailbox “ADMIN” -ThrottlingPolicy CloudMigratorPolicy

These items should be blank:

CPAMAXCONCURRENCY (EXCHANGE 2010 SP1)
CPAPERCENTTIMEINCAS (EXCHANGE 2010 SP1)
CPAPERCENTTIMEINMAILBOXRPC (EXCHANGE 2010 SP1)
EWSMAXCONCURRENCY
EWSPERCENTTIMEINAD
EWSPERCENTTIMEINCAS
EWSPERCENTTIMEINMAILBOXRPC
EWSMAXSUBSCRIPTIONS
EWSFASTSEARCHTIMEOUTINSECONDS
EWSFINDCOUNTLIMIT
RCAMAXCONCURRENCY
RCAPERCENTTIMEINAD
RCAPERCENTTIMEINCAS
RCAPERCENTTIMEINMAILBOXRPC

To check which throttling policy is applied to the Admin account, execute the following command:

Get-Mailbox "ADMIN" | fl -property ThrottlingPolicy

Item Export Delay

You could also try implementing an item export delay in CloudM Migrate. This is found under Common > Other Options > Item Export Delay. We recommend entering a value in milliseconds from between 1000 to 3000, it's trial and error though, so start at 1000 and increase to 2000 or 3000 if it persists in failing.