[DRBD-user] 3 way replication

Brian R. Hellman brian at linbit.com
Fri Mar 20 14:51:53 CET 2009

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


Mark Olliver wrote:
> Hi,
> 
> If i want to migrate my 2 node DRBD setup (standard primary/secondary)
> to become a 3 node setup do i need to first unmount the live primary
> disk or can i just make the changes needed in the drbd.conf then drbdadm
> adjust as required / bring online the stacked resource.

Yes you should be able to.

> 
> Also i see it says we make the upper level primary two which makes sense
> as it is the sync source but i take it that the lower level primary is
> the one which we should still actually mount and write data too?
You'll actually write to the primary of the stacked resource.
I wrote a howto located here that may assist you :)
It is designed to be a copy paste howto, so it is fairly basic, but it
works.
http://www.howtoforge.com/drbd-8.3-third-node-replication-with-debian-etch

> 
> Regards
> 
> Mark
> 
> 
> *Mark Olliver BSc (Hons) MBCS CITP FCNSA,*
> *Thermeon (Systems Admin)*
> Russ Hill Farm, Russ Hill, Charlwood, Surrey, RH6 0EL, UK
> E. mark at thermeon.com <mailto:mark at thermeon.com>
> M. +44 79 20 062 647
> 
> 
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