Bjoern,
If I understand your situation correctly on the server that you need to 
transfer data from you need to set the default replication server to the 
desired target then on selected nodes you remove them from their current 
replication role and update their replication mode.

There may be a better way but this worked for me:

Example:
(Assuming the two server are already defined to each other)
On the "new" target server set the default replication server to the new source 
server:
SET REPLSERVER source_server_name

Remove the node you wish to replicate from its current replication role:
REMOVE REPLNODE node_name

Update the note to its replication state/mode:
UPDATE NODE node_name REPLSTATE=ENABLED REPLMODE=SEND

Repeat the REMOVE REPLNODE and UPDATE NODE commands for the same node on the 
server that will receive the data so it is configured to receive instead of 
send data:
REMOVE REPLNODE node_name
UPDATE NODE node_name REPLSTATE=ENABLED REPLMODE=RECEIVE

Then use the node replication command to replicate the data.
When complete change the replication mode for each node back to their desired 
state.
SENDING node back to REPLMODE=SEND and receiving node back to REPLMODE=RECEIVE

-Rick Adamson


-----Original Message-----
From: ADSM: Dist Stor Manager <ADSM-L@VM.MARIST.EDU> On Behalf Of Nachtwey, 
Bjoern
Sent: Thursday, January 31, 2019 5:07 AM
To: ADSM-L@VM.MARIST.EDU
Subject: [ADSM-L] Question on switching server roles in replication

* This email originated outside of the organization. Use caution when opening 
attachments or clicking links. *

----------------------------------------------------------------------
Dear all,

I set up a new server for one of our customers and will use the old server and 
library as target for replication. First I tried to export the data, but this 
takes too long due to the amount of data. So my next approach is to set up 
replication from the existing server to the new one and afterwards switch the 
roles: the former source server becomes the target server and vice versa, later 
on I switch both rules and replicate from the new server to the old one.

Unfortunately some data was backed up to the "former source server" but not 
replicated to the "former target server" when switching the roles for some 
nodes.
So now some backups are already run to the "new source server" (former target) 
server and the "new" target server (former source server) holds some data, the 
"new source server does" not have.

What's the best way to get both servers synchronized?
Perhaps I do a wrong assumption: Will that "additional" data on the "new target 
server" be deleted if I start the replication or can I switch the roles as 
often I like and synchronize by replicating the data first in one direction and 
then vice versa?

Thanks & best
Bjørn
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Bjørn Nachtwey

Arbeitsgruppe "IT-Infrastruktur"
Tel.: +49 551 201-2181, E-Mail: bjoern.nacht...@gwdg.de
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