Hello everyone,
we are migrating about 5000 Mailboxes from Domino to Exchange. Our first Try was to migrate directly from Domino (9) to Exchange Online. The throughput was under 300MB/hour and we had tried everythig to get it higher (even MS Throttling was set higher). Because we have no chance to migrate all Mailbox Data from the bigger Mailboxes over Night and have a Timeslot till end of March we changed our Strategy and migrate the Mailboxes in the same onPremises Environment and move the Mailboxes from onPrem to Exchange Online. Unfortunately we are getting about the same results (~250MB/hour, some Mailboxes about 700MB/hour), what is way to slow.
Two Years ago we migrated in our "Sister Company" and hat about 800B/hour per Mailbox with the same Migration topology.
We analyzed the Logs and found, that sometimes there are Gaps, where the Migrator seems to do nothing, the CPU goes to zero and nothing happens. The log writes "migrating message" and after a long time "migrated message".
So after a long Wall of Text, here are my Question: What does the Quest Migratotor exactly do between these two Steps and where could be the bottleneck? Is the Thread waiting for something? Is it writing to Disk? Could the Virusscan Engine be a problem?
Every hint could be useful. Thank you in Advance!
Best regards
Christian