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Chapter 8. Conversion to Active/Active

8.1. Requirements
8.2. Install a Cluster Filesystem - GFS2
8.3. Setup Pacemaker-GFS2 Integration
8.3.1. Add the DLM service
8.3.2. Add the GFS2 service
8.4. Create a GFS2 Filesystem
8.4.1. Preparation
8.4.2. Create and Populate an GFS2 Partition
8.5. Reconfigure the Cluster for GFS2
8.6. Reconfigure Pacemaker for Active/Active
8.6.1. Testing Recovery

Requirements

The primary requirement for an Active/Active cluster is that the data required for your services are available, simultaneously, on both machines. Pacemaker makes no requirement on how this is achieved, you could use a SAN if you had one available, however since DRBD supports multiple Primaries, we can also use that.
The only hitch is that we need to use a cluster-aware filesystem (and the one we used earlier with DRBD, ext4, is not one of those). Both OCFS2 and GFS2 are supported, however here we will use GFS2 which comes with Fedora 13 .