Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Disaster Tolerance and Recovery in an MC/ServiceGuard Cluster
Disaster Tolerant Architecture Guidelines
Chapter 1 43
• A rolling disaster is a disaster that occurs before the cluster is able
to recover from a non-disastrous failure. An example is a data
replication link that fails, then, as it is being restored and data is
being resynchronized, a disaster causes an entire data center to fail.
The effects of rolling disasters can be mitigated by ensuring that a
copy of the data is stored either off-line or on a separate disk that can
quickly be mounted. The trade-off is a lack of currency for the data in
the off-line copy.