[DRBD-user] Adding additional 'node' to DRBD

Paul O'Rorke paul at tracker-software.com
Wed Jan 30 16:49:39 CET 2019

Thanks Roland,

I am not sure if I should start a new topic for this, but now you have 
me wondering....

I use a classic 3 node setup, LVM backing devices, and a stacked third 
node for DR using Protocol A.  I have a VPN between the main site and 
off-site and the latency hovers around 10ms.

Are there compelling reasons for me to look into DRBD 9?  My current 
setup is pretty solid, so far I have never needed to use the off site 
copies (touch wood).  I have 12 resources (all KVM HA servers) piped 
through the VPN.


*Paul O'Rorke*
*Tracker Software Products (Canada) Limited *
www.tracker-software.com <http://www.tracker-software.com/>
Tel: +1 (250) 324 1621
Fax: +1 (250) 324 1623


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On 2019-01-30 12:55 a.m., Roland Kammerer wrote:
> On Tue, Jan 29, 2019 at 01:38:14PM -0800, Paul O'Rorke wrote:
>> What does node-id do?
> With more than two nodes DRBD needs some information against which other
> peer(s) it tracks changes. In DRBD8 you only have one peer, "easy", in
> DRBD9 you have to know this is "Node A", this is "Node B",... Using
> information that changes (e.g., hostnames) is too volatile. So one has
> to give nodes an ID, a unique identifier that never changes. (There are
> scenarios where you don't need them even in DRBD9 setups, but let's not
> go down that rabbit hole).
>> Is it a drbd 9.0.x / Linstore thing?  I'm using 8.9.6
> yes, a DRBD9 thing.
> Regards, rck
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