An error “Mailbox export stalled due to source disk latency” can occur during Exchange mailbox migration to a new database or a new server. This error is not sent as output result rather the migratin is stuck there for quite a long time and then show this error as mentioned above while checking the progress of migration using the Get-MoveRequestStatistics cmdlet.

They may experience this error while exporting mailboxes from the source database to the target database also.

This occurrence of error indicates the mailboxes are stuck in migration. We have the major scenarios, during which Exchange administrators experience this error.

The Exchange Server error “Mailbox export stalled due to source disk latency” may occur in the following scenarios.

• While running a new batch migration with New-MoveRequest -Identity ‘MailboxOrMailUserIdParameter’ -TargetDatabase “Name Of New Database” cmdlets
• While exporting an Exchange Server mailbox to PST file format using this command –
  New-MailboxExportRequest -Mailbox -FilePath <pstFilePath>
• While performing migration to a new mailbox database on the same Exchange Server with this syntax command in the Exchange Management Shell.
  New-MoveRequest “<DescriptiveName>”] -Identity <MailboxIdentity> [<-ArchiveOnly | -PrimaryOnly>] [-TargetDatabase <DatabaseIdentity>

The error itself says that source disk latency is the main issue behind the stalled mailbox export, which is caused due to errors in disk performance, timed-out migration batches, delay in response time, etc.

What you can do as an Exchange Server administrator to resolve the error?

As an Exchange administrator, you can follow the solutions given below to fix this error eventually and restart the mailboxes export or migration.

• Check Windows Server Performance Monitor
  1. Go to the Performance Monitor on the source Windows Server.
  2. Monitor MSExchange Replication, MSExchange Replication Server parameters.
• Check the disk perfrmance
  Exchange administrators can check the disk performance from Disk Management Software. Also, they can check the hard drive condition, drivers, and installers. If all seems not well, then it is recommended to install the latest RAID pack with SSD drives. Once these are installed, re-run the migration cmdlet and check if the error is still there.
• Remove the old Export Requests
  The migration stalled error can be due to old requests that are stuck up. Users can either directly remove then and run them again one by one. Alternately, they can suspend them for about 10 minutes and then resume the export.To remove a mailbox export request, use this command.
  Remove-MoveRequest –Identity “mailbox address”
  Enter a new mailbox export request for the same mailbox with prime priority.
  New-MoveRequest –Identity “mailbox address” –BatchName “Existing Database to New Database Name” –Priority Highest

  Exchange administrators can suspend the mailbox export request by running this command.
  Suspend-MoveRequest -Identity “mailbox address”
  Wait for at least 20 minutes and then resume this mailbox export request.
  Resume-MoveRequest -Identity “mailbox address”

All the suggested solutions need an expert-level knowledge for successful performance.

Many users may still face the error even after following the above methods as the problem can be in the Exchange database. For them, we would like to recommend our final solution – Kernel for Exchange Server.

Final Solution – Kernel Exchange Recovery Tool

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Conclusion

Exchange errors create serious problem for the administrators, especially while performing Exchange mailbox export or migration. Sometimes mailbox export gets stalled due to disk latency. Such error needs to be corrected to continue the process. Some feasible solutions are mentioned in this blog, but the easiest way to perform recovery and migration is using a professional recovery tool.