Using Dovecot 2.2.15.8

We use dsync as shown at http://wiki.dovecot.org/Replication 
<http://wiki.dovecot.org/Replication> to have a second copy of our mail store. 
Users connect to one server and the other is considered a secondary, and is 
there “just in case”. If one-way backup/sync would make more sense, I would 
consider that, but at the time we set it up (October 2013), I recall there was 
some issue with one-way not being as reliable. 

We had some problems with the secondary mail server and had to take it off line 
for while. Now that the mail on that server is stale, what is the best way of 
starting over? When I simply turned it back on after a lengthy break (weeks), 
some users were reporting deleted messages showing up in their inboxes. I know 
dsync is master/master and uses index files, but I am not certain of the 
details and whether this behavior is completely unexpected or not.


The laundry list:
What are the f and R flags for sync? http://wiki2.dovecot.org/Tools/Doveadm/Sync
Use doveadm backup to get the initial data over to the seconday?
Can the server be in use while I do backup?
Do I need to wipe the secondary and start over?


Thanks !
-JK

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John "JK" Krug
System Administrator
The University of Chicago | Laboratory Schools
1362 East 59th Street  |  Chicago, IL  60637
Phone: (773) 834-4476
j...@ucls.uchicago.edu <mailto:jka...@ucls.uchicago.edu> | 
http://helpdesk.ucls.uchicago.edu
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