This guide describes DRBD version 8.4.x. For 9.0 please look here(8.3).


2.2. Dual-primary mode

In dual-primary mode, a resource is, at any given time, in the primary role on both cluster nodes. Since concurrent access to the data is thus possible, this mode requires the use of a shared cluster file system that utilizes a distributed lock manager. Examples include GFS and OCFS2.

Deploying DRBD in dual-primary mode is the preferred approach for load-balancing clusters which require concurrent data access from two nodes. This mode is disabled by default, and must be enabled explicitly in DRBD’s configuration file.

See Section 6.8, “Enabling dual-primary mode” for information on enabling dual-primary mode for specific resources.


This guide describes DRBD version 8.4.x. For 9.0 please look here(8.3).