SPARC: Recovery Concerns When Using Storage-Based Data Replication

As with all campus clusters, those that use storage-based data replication generally do not need intervention when they experience a single failure. However, if you lose the room that holds your primary storage device (as shown in Figure A–2), problems arise in a 2–node cluster. The remaining node cannot reserve the quorum device and cannot boot as a cluster member. In this situation, your cluster requires the following manual intervention:

1. Your Sun service provider must reconfigure the remaining node to boot as a cluster member.

2. You (or your Sun service provider) must configure an unreplicated volume of your secondary storage device as a quorum device.

3. You (or your Sun service provider) must reconfigure the remaining node to use the secondary storage device as primary storage. This reconfiguration might involve rebuilding volume manager volumes, restoring data, or changing application associations with storage volumes.