crpb
thanks for your answer! That´s what I did, I added a 8TB additional volume in the virtualization cluster to this VM and mounted it to /var/lib/gromox. That´s much more faster now. In round about 20 minutes I migrated 2,5GB and round about 73.000 emails.
I am running now an test migration for the whole old mailsystem to calculate which time it needs.
BTW: @WalterH @crpb it looks like, that you did often migrations. Is there any possibility to apply the changed mails (new, moved, delete, ...) from Kopano to grommunio? So that we can re-run the migration every x-hours and that it is maybe finishing then in round about 1 hour and not in round about 14hours? (As example). Just the delta? Like "rsync"?
Or can we only run the whole migration and have to block the old mail system during this time?
