1、Systems Availability and Business Continuity,Chapter FourPrepared by: Raval, Fichadia,Raval Fichadia John Wiley & Sons, Inc. 2007,Chapter Four Objectives,Understand system availability and business continuity, and recognize differences between the two.Comprehend incident response systems and their r
2、ole in achieving the system availability objective.Explain disaster recovery planning objectives and its, design, implementation and testing requirements.Comprehend the link between business continuity and disaster recovery.Understand the role of backup and recovery in disaster recovery plans.,Power
3、 outage at Northwest Airlines,Thunderstorm and lightening at the datacenter location caused the problem. Systems, down initially, operated in a degraded manner the next morning. Took very long to check people in flights. NWA triggered manual processes. Lines became longer and so did the delays in de
4、parture. Arrivals were late, but the departures from gates at the destination airport made the flights to wait before they could get to the gate. NWA announced an embargo, limiting itself to what it can handle under the circumstances.,System Availability and Business Continuity,System availability a
5、ssures you that business will continue to operate. Business continuity is necessary for systems to add value on an ongoing basis. The issues of business continuity and systems availability are related and even overlap to a degree.,Incident Response,Incident: A level of interruption in the system ava
6、ilability that appears to be temporary. An incident can be triggered by an accidental action by an authorized user, it may result from a threat. Incidents may be detected by: End-users who may describe the symptom but not the cause. Those monitoring systems and processes may detect anomalies which l
7、ead to an incident that has occurred. Attack: A series of steps taken by an attacker to achieve an unauthorized result. Event: An action directed at a target that is intended to result in a change of state, or status, of the target. An event consists of an action and a target.,Nature of Response to
8、an Incident,Assess the business significance of the incidents impact. Identify critical business processes that might have been compromised. Determine the root causes of the incident. This might present a challenge, for every incident could be of a different variety. The team may need to consult exp
9、erts from outside the team. Training in forensics could help the team collect and evaluate evidence systematically. Standard procedures must be followed for restoring the affected systems and processes, instead of ad hoc, one-off attempts to restore what is compromised or lost.,Preventive Measures,P
10、revention is better and could be more cost effective - than a cure. Preventive measures require an anticipation or prediction of what might happen in terms of incidents and consequent compromises. Lessons learned from the organizations and from others experiences can help design and implement effect
11、ive preventive measures.,Incident Response Team,A multi-skilled group, since the incident may be any variety and may impact almost any information asset. May include representation from human resources, legal, information systems, networks and communications, physical security, information security,
12、 and public relations. A top management team member may be designated as a direct contact for counseling and support.,CERT,CERT stands for Computer Emergency Readiness Team. Also called CERT Coordination Center (CERT CC), it is the Internets official emergency team. Provides alerts and offers incide
13、nt handling and avoidance guidelines. Is located at Carnegie-Mellon University. www.cert.org,Disaster Recovery,Disaster: An event that causes a significant and perhaps prolonged disruption in system availability. Disasters can be man-made or natural. Man-made disasters can be malicious or unintentio
14、nal. Disaster recovery is a systematic effort to recover from the impact of a disaster. Best way to understand recovery is by focusing on post-disaster phases. Post-disaster phases Immediate response Near-term resumption Recovery toward normalization Restoration to pre-disaster state,Timeliness of A
15、ction and Value of Recovery,Timeliness of action The timeline of actions planned should reflect value of the action at the time. Certain steps can wait while others must be taken without delay, to minimize losses. Value of recovery Timeliness of action reflects value of the recovery target. Consider
16、ing this, recovery tasks should be systematically assigned to each post-disaster phase.,Disaster Recovery Planning (DRP),DRP: The definition of business processes, their infrastructure supports and tolerances to interruptions, and formulation of strategies for reducing the likelihood of interruption
17、 or its consequences. Component steps of DRP: Define the process Identify what supports the process and its tolerance to interruptions Determine and implement strategies that would reduce the likelihood and cosequences of interruptions.,Disaster Recovery Planning (DRP),Assessing potential losses: Di
18、saster Impact Analysis What disasters the firm is likely to face? What is the probability of each type of disaster? What is the impact of the disaster on the firm?,Disaster Recovery Planning (DRP),Value-based recovery planning Definition of criticality and criteria to determine criticality Identific
19、ation of critical business processes and their supports Identification of the role of information systems resources in the critical process Determination of process owners and process customers Determination of the amount of time the business can survive without the process post-disaster Identify in
20、terdependencies between the process and the rest of the business processes and systems To find critical processes, consider attributes such as importance, key users, tolerance to outage, waiting time between cycles, possibility of data recovery.,Disaster Recovery Planning (DRP),Disaster recovery str
21、ategies How do we recover a system given its priority? Address the question by system components. Data (e.g., designate off-site storage) Processing (e.g., backup and store offsite current copies of the software) Network and communication (e.g., backup and store offsite a copy the current network co
22、nfiguration) Dependencies with other systems (e.g., identify how these processes will be interfaced post-disaster),DRP: Recovery Locations,Recovery location: A site(s) where processes and systems will be recovered post-disaster. Hot sites: Near-perfect replicas of the operations. Cold sites: Just th
23、e infrastructure (computer operations room, platform for installing hardware, power and communication lines, cabling, etc.). Warm sites: More than just a cold site, but not quite as ready as a hot site. For example, it may include commonly used computers and operating system. Reciprocal agreements:
24、Sharing of similar resources by those in the same or similar computing enviornments. Colocations: Recovery is planned using availability of computing resources at the firms many locations.,DRP: Teams,Purpose of forming teams is to ensure that recovery tasks are accomplished in an orderly and respons
25、ible manner. The number and nature of teams could vary across organizations. However, each team should include knowledge and skills necessary to perform its assigned tasks. Recovery teams can be organized by recovery phases. Flexibility in assignments is necessary, for an actual disaster may need ad
26、justments to the team. Non-availability of some team members when disaster strikes is also likely.,DRP: Disaster Readiness,Meaning of readiness: Having the assurance that if and when a disaster strikes, the firm has a high likelihood of recovering from the disaster. Testing of the plan is crucial to
27、 get this assurance. Disaster readiness practices include: Walkthroughs: Having a plan preparer walk though others to show how the plan leads from point A to point B. Rehearsals: An “as-if” exercise to simulate a disasters impact and have people responsible recreate recovery of “lost” processes and
28、systems. Compliance (Live) testing: Actual test of recovery with a simulated disaster.,Business Continuity Planning (BCP),BCP: The totality of plans made to recover the business operations following a disaster. Recovery of all operations is involved, not just information assets. Methods and strategi
29、es adopted for BCP are comparable to, and often overlap with, those used in DRP.,Business Continuity Planning (BCP),Business impact analysis is an exercise in risk assessment. Identify vulnerabilities of the firm. Assess the business impact Focus on a particular disaster and determine processes that
30、 might be affected, and/or Analyze all business processes to assess probable business impact in the event that a disaster strikes. Initiate a planning process to develop methods and strategies to mitigate risk. Business recovery Approaches and methods for business recovery are similar to those discu
31、ssed in disaster recovery planning.,Assurance Considerations,Any assurance that BCP/DRP will be effective requires an examination of such plans from three angles: Method: Review the method followed in the development of the plan. A sound planning process make possible a plan that is complete and rel
32、iable. Content: Should have been collected from “right” participants, and the instruments and methods used to collect data must be valid. The plan should be current. Testing: Critical components of the plan should be tested, results should be documented, and corrective action, where necessary, should follow.,
