[DRBD-user] stacking drbd 3 high

Felix Frank ff at mpexnet.de
Thu Aug 30 16:02:16 CEST 2012

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

On 08/28/2012 09:50 PM, Two Spirit wrote:
> I'm sorry, I have no clue what the diagram represents nor what the ()
> signifies in the diagram. I'm still a newbie, could I get layman english
> translation please.

Hmm, turns out thunderbird displays this quite awkwardly, for one.

>      A--B
>      |  |
>     (C) C
>         |
>      offsite

What I'm saying is:

You have failover nodes A and B, one of which mounts a stacked resource.
C is the third node in your three-node setup. On C's side, its drbd
resource (which is lower level from A/Bs perspective) is stacked on yet
another drbd resource that is shared with the offsite node.

Please note that there can be no "read only mirror" in this scheme. DRBD
secondaries are not read-only. Rather they are "hands off" until you
loose the primary and promote the standby node. You can opt to use it in
read-only mode then.


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