On Tue, Dec 5, 2017 at 8:54 AM, Sami Ketola sami.ketola@dovecot.fi wrote:
Can't really do DNS change to test with one user as DNS change affects all users.
Yes, of course. For test purposes one could justchange the system's host file and simulate a DNS change, after imapsync is complete I meant a simple test just to see what happens at the client size, to see what the user itself could notice.
On Tue, Dec 5, 2017 at 8:54 AM, Sami Ketola sami.ketola@dovecot.fi wrote:
What we usually do is put layer of dovecot proxies in front of the legacy and destination platform and then have database with information if user has been migrated already and forward the connection to legacy or dovecot platform based on that info. That enables us to migrate user-by-user.
Cool, we do that too :D. We might have learned that from you even. In that way users can use our Webmail from day 1 when migration starts.
On Tue, Dec 5, 2017 at 8:54 AM, Sami Ketola sami.ketola@dovecot.fi wrote:
And both users and mail server admins do notice if there is IMAP UID or POP3 UIDL changes. Imagine what happens when millions of users suddenly start to redownload terabytes of data.
Sami
That would just kill my cluster. Happened once due to NFS sharing hang. Terrible day to be alive.
Regards,
Webert Lima DevOps Engineer at MAV Tecnologia *Belo Horizonte - Brasil*