On 10/12/2013 07:16 PM, DTNX Postmaster wrote:
On Oct 12, 2013, at 17:04, teknet9 <tekn...@o2.pl> wrote:
Thank you for advise.
I have many users i can not allow for any downtime (not even few seconds).
Also i can not loose any single email.
Your solution will not guarantee that.
I am looking for true HA solution.
That is why both servers needs to work at the same time for 1-2 months
to allow users to test new account and to migrate when ready.
During migration both servers needs to work correctly (two way sync)
Don't run them side by side, but cut over. This is much less of a disruption
for your users than having them test their account and whatnot. Testing is your
job, not theirs.
Follow the suggestions already given. Whether Jeroen's suggestion or a straight
cut-over with hot sync followed by a cold sync will work best for you will
depend on the specifics of your setup. If you prep this properly you can
probably do this within a planned downtime window of half an hour, maybe even
less.
Mvg,
Joni
Agreed.
My proposal was mostly based on swapping out the server, which can
circumvent DNS expiries if that's what he is worried about.
But even so it would be trivial to keep the old server running as an
incoming relay after the migration, so he doesn't have to wait for the
MX to expire.
I'm curious what you meant by "hot sync" and "cold sync" exactly - from
your reply it seems it's not quite the same I was suggesting.
--
J.
