[DRBD-user] active-active mode

Digimer lists at alteeve.ca
Wed Sep 26 04:08:44 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 09/25/2012 02:11 PM, raulhp at ugr.es wrote:
> Hi,
> How I can to use active-active mode or primary-primary mode? I understand
> that I can to use with file system for a cluster GFS, etc.
> Tell me please.
> Regards!

In DRBD, this is called "dual-primary" mode. You are write in that you 
need a cluster-aware file system like GFS2, which I use, or OCFS2.

The most important thing you need to make dual-primary safe is to have a 
fence device. This is a mechanism for forcing one of the nodes to power 
off if the communications between the node breaks. This can be provided 
by a cluster resource manager like Red Hat's cluster service or pacemaker.

Beyond this, the topic starts to get more complex. If you want more 
advice, you will need to be a little more specific on what it is you 
want to do.

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