5. Disaster Recovery Planning Flashcards
Disaster Recovery Planning ( DRP)
Is undertaken to reduce risks related to the onset of disasters and other events. It’s closely related to business continuity planning.
Groundwork for DRP
Begins in BCRP activities such as the business impact analysis, critically analysis, establishment of recovery objectives, and testing.
The business impact analysis and critically analysis
Help to prioritize which business processes (and, therefore, which IT systems) are the most important
Key Recovery Target
Specify how quickly IT applications are to be recovered.
Testing of DRP plans
Can be performed in coordination with tests of BCP plans to more accurately simulate real disasters and disaster response.
Recovery Time Objective (RTO)
The period from the onset of an outage until the resumption of service. RTO does not mean that the system /process has been recovered to 100 % of its former capacity,
Recovery Point Objective (RPO)
RPO is the period for which recent data will be irretrievably lost in a disaster.
Pricing RTO and RPO capabilities
The shorter the RTO or RPO for a given system, the more expensive it will be to achieve the target.
Recovery Objective Development
- Conduct BIA
- Establish RTO, RPO recovery targets
- Develop technical architecture and process to support recovery targets
- Implement technologies
Hot Sites
An alternate processing center where backup systems are already running and in some state of near-readiness to assume production workload.
When hot site is the best choice
For systems whose RTO targets range from 0 to several hours, perhaps as long as 24 hours.
Warm Sites
An alternate processing center where recovery systems are present, but at a lower state of readiness than recovery systems at a hot site
When warm site is appropriate
For organization whose RTO figures range from roughly one to seven days.
Cold sites
An alternate processing center where the degree of readiness for recovery system is low.
When is the cold site appropriate
When outage exceed 7 to 14 days. The advantage of a cold site is its low cost.
Mobile site
A portable recovery center that can be delivered to almost any location in the world
Cloud sites
Organizations are using cloud hosting services as their recovery sites
Reciprocal Sites
A data center that is operated by another company
Recovery and Resilience technologies
Once targets have been established, the next major task is the survey and selection of technologies to enable recovery time and recovery point objectives to be meet.
Replication
Activity where data is written to a storage system us also copied over a network to another storage system
Synchronous replication
writing data to a local and to a remote storage system is performed as a single operation, guaranteeing that data are identical.
Asynchronous replication
writing data to the remote storage system is NOT kept in sync with updates
