Delete migration batch and start over

Question

we've successfully migrated all but one group of on-prem mailboxes to O365.

On this last batch, something has gone wrong -- several of the mailboxes show 10 times more items and data than actually exist in the user's mailboxes, according to on-prem Exchange Management Shell. It seems like the migration batch is corrupted or broken somehow, I don't think it's ever going to finish. 

For example -- user A has 3700 items of 449 MB in their on prem mailbox. However, the migration batch shows it has migrated 17,000 items and 5GB of data. I'm 100% certain this user's mailbox has never gotten that large, she's a light mail user and we use retention policies to keep Deleted Items cleared out. 

This is also the case for the other mailboxes in the batch. At one point this batch changed to "failed" because of a timeout,  I had too many mailbox moves going at once. I Resumed this last batch after the other finished, and it's been using full bandwidth since then, but the data shown is not correct.

Question is -- can I safely Stop the migration batch, then once it's stopped, delete it and try creating it again? Is that safe to do without losing any data from my user's mailboxes?

Answer 1

I found the powershell commands to safely remove the migration batch, and restarted the mailbox moves in smaller batches running one at a time.