[DRBD-user] Can i add Third Node with existing DRBD setup ?

Andreas Kurz andreas at hastexo.com
Wed Nov 16 20:40:11 CET 2011

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


On 11/16/2011 06:13 PM, fosiul alam wrote:
> Hi
> I just completed my test of DRBD with 3node
> 
> our Situation is like ethis :
> 
> We will have 2 node in Uk and One node in Denmark.
> 
> suppose If i create 2 node in Uk  with internal meta-disk options, with
> bellow drbd.conf
> 
> http://www.drbd.org/users-guide/re-drbdconf.html
> 
> and if its runs for couple of month ..
> 
> 
> then if i want to add a 3rd node ..
> will i be able to do this without lossing data of node1 and node2 ??

If you already know for sure you will add a third node you can set up
your system with stacked devices from the beginning:

http://www.drbd.org/users-guide-8.3/s-three-nodes.html

... and run without third node. This has the advantage that there will
be no service downtime when adding the third node.

If you want to start with a two-node setup, this is also possible but
you need to prepare your setup to keep some free space at the end of the
device for the internal meta-data that is obligatory for a stacked
resource.

No problem if you use LVM, then you can resize the device later ... or
you create a file system smaller than the device ... or change to
external meta-date for the lower resource later ... there are several
possibilities ...

Regards,
Andreas

-- 
Need help with DRBD?
http://www.hastexo.com/now

> 
> Please advise ..
> 
> Thanks
> Fosiul.
> 
> 
> 
> 
> 
> 
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> drbd-user at lists.linbit.com
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