1. What is the general approach to disaster recovery as specified in Schmidt? 2.

Question

1. What is the general approach to disaster recovery as specified in Schmidt?
2. What is the role of policy in disaster recovery?
3. Compare and contrast shared systems, hot standby systems, and cold standby systems for disaster recovery.
4. When shipping data by file replication, what are some of the problems that can be encountered? How can those problems be resolved?
5. Based on the concepts of this course, how would you change your home or office systems design to provide better availability or recovery capabilities?

Explanation / Answer

1.In information technology, disaster recovery refers to the precautionary measures needed to enable production operation and therefore mission-critical applications to be resumed after partial or total destruction of a production site (“data center” in an IT infrastructure A disaster refers to the failure of a data center due to power outage or destruction (by fire, flooding, explosion, earthquake, storm, sabotage, etc) or, more specifically, to the failure of a host and local storage peripherals or only parts of storage peripherals on which current production data resides. In essence, a disaster of this kind is an event which is caused by external factors and results in an interruption of production operation. Consequently, it is necessary to switch over to analogous resources in a standby data center in order to resume production operation. In the following, the term standby data center refers either to a remote data center with equivalent hardware or to hardware equipment (usually host, disk storage, network components) which is capable of supporting the corresponding applications, which is separated from the production host and its associated disk storage subsystems by at least a firewall, and which has its own power supply.

3.Cold standby / hot standby / backup These are terms which describe the role of a standby data center. Cold standby (or backup data center) refers to a standby data center that is not in production use (but may well be used for test applications) and is activated only if a disaster occurs. Cold standby cannot therefore be part of a symmetric disaster tolerant architecture. Hot standby is a system that is up-and-running and is always ready to run the applications of the work data center in the event of a disaster. Downtime is therefore shorter and both symmetric and asymmetric disaster recovery are possible.

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