Hello,
I am planning currently a migration between a very poorly setup Zimbra server on a debian etch/32bit system.
We have 369 accounts and a mailstore volume of about 370 GB.
The main problem is that the disks are very slow and everything is setup on the same raid1 so we suffer from very poor I/O.
A fullbackup with our backup solution (go through all users, set user in maintenance, sync index store, retrieve a list of messages for this user, set user active, backup those messages, go on to next user ...) takes up to 3 days. This backup is done to a relativly fast server with a good disk array over gigabit Network.
I understand I have to upgrade to at least zimbra 6.0.7, do you have any preference for a 6.0 version or does it not matter which i choose to upgrade to?
After that, how long will the export approximatly take? As long as the discribed fullbackup above, or will it be shorter?
What happens to my system while the export is in progress, do people have access to their mailboxes?
What happens to mail received after I started the export? Could I do incremental export after the initial export (which would be much faster as it does not contain that much emails and therefore I could stop accepting mails for this last export/import and start accepting mails on the new server once finished)?
Could convert the standalone server with the the new server (64bit, 7.1.1) into a multiserver setup and migrate with your tool the mailboxes in multiple batches and leaving both servers active at the same time?
Are there other ways I could migrate the mailboxes I have not thought about without much service interruption?
Thank you for your hints,
best regards
Raimund