[DRBD-user] 3 Node replication

Philip Gaw pgaw at darktech.org.uk
Thu Mar 20 12:18:26 CET 2014

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On 20/03/2014 09:51, Chris Tothill wrote:
> Since no-one else has replied...

I replied to this off-list.

> I can't see any reason why it shouldn't work with a routed address 
> (provided of course that your router/firewall passes traffic on the 
> correct TCP ports) since it's just sending IP packets- it doesn't 
> matter how they make the trip, just that they do. Performance might be 
> questionable depending on the speed of the link. The danger of split 
> brain would be severe- you'd need good fencing, as everyone always 
> says! Personally I prefer to have the DR site have a regular snapshot 
> of the data rather than a live copy in case of corrupted data being 
> written to all your copies and then having to recover from backup, but 
> it depends entirely on your application.
> Chris
>
+1. Only other thing to add here is you might also want to look at 
drbd-proxy depending on the size of the replication link
and the rate of data change.


--------------------------
> Christopher Tothill
> Senior IT Support Specialist
> University of Bristol
> ---------------------------
>
>
> On 18 March 2014 16:53, gerry kernan <gerry.kernan at infinityit.ie 
> <mailto:gerry.kernan at infinityit.ie>> wrote:
>
>     Hi
>
>     I hope this is not a completely dumb question, I have a 3 way
>     replication cluster setup and it is running well no problems. I
>     now wish to move the 3^rd node to a datacentre for DR. can I use a
>     routed address in the drbd resource conf file as the IP address on
>     the 3^rd node or do the addresses have to be on the same subnet.
>
>     Best Regards,
>
>     Gerry Kernan
>
>     InfinityIT
>
>     Suite 17 The Mall | Beacon Court | Sandyford | Dublin 18
>
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>
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