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7: Business Continuity and Disaster Recovery
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A server cluster is typically implemented in a single physical location such as a data center However, a cluster can also be implemented where great distances separate the servers in the cluster This type of cluster is called a geographic cluster, or geo-cluster Servers in a geo-cluster are connected through a wide-area network (WAN) connection A typical geographic cluster architecture is shown in Figure 7-10 Network Connectivity and Services An overall application environment that is required to be resilient and have recoverability must have those characteristics present within the network that supports it A highly resilient application architecture that includes clustering and replication would be of little value if it had only a single network connection that was a single point of failure An application that requires high availability and resilience may require one or more of the following in the supporting network: Redundant network connections These may include multiple network adapters on a server, but also a fully redundant network architecture with multiple switches, routers, load balancers, and firewalls This could also include physically diverse network provider connections, where network service provider feeds enter the building from two different directions Redundant network services Certain network services are vital to the continued operation of applications, such as DNS (domain name service, the function of translating server names like wwwmcgraw-hillcom into an IP address), NTP (network time protocol, used to synchronize computer time clocks), SMTP (simple mail transfer protocol), SNMP (simple network management protocol), authentication services, and perhaps others These services are usually operated on servers, which may require clustering and/or replication of their own, so that the application will be able to continue functioning in the event of a disaster
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Disasters and other disruptive events can damage information and information systems It s essential that fresh copies of this information exist elsewhere and in a form that enables IT personnel to easily load this information into alternative systems so that processing can resume as quickly as possible
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Figure 7-10
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NOTE Testing backups is important; testing recoverability is critical In other words, performing backups is only valuable to the extent that backed-up data can be recovered at a future time Backup to Tape and Other Media Tape backup is just about as ubiquitous as power cords From a disaster recovery perspective, however, the issue probably is not whether the organization has tape backup, but whether its current backup capabilities are adequate in the context of disaster recovery An organization s backup capability may need to be upgraded if: The current backup system is difficult to manage Whole-system restoration takes too long The system lacks flexibility with regard to disaster recovery (for instance, how difficult it would be to recover information onto a different type of system) The technology is old or outdated Confidence in the backup technology is low Many organizations may consider tape backup as a means for restoring files or databases when errors have occurred, and they may have confidence in their backup system for that purpose However, the organization may have somewhat less confidence in their backup system and its ability to recover all of their critical systems accurately and in a timely manner Tape is not the only medium for backups While tape has been the default medium since the 1960s, using a hard disk as a backup medium is growing in popularity: hard disk transfer rates are far higher, and disk is a random-access medium, whereas tape is a sequential-access medium E-vaulting is another viable option for system backup E-vaulting permits organizations to back up their systems and data to an off-site location, which could be a storage system in another data center or a third-party service provider This accomplishes two important objectives: reliable backup and off-site storage of backup media Backup Media Off-Site Storage Backup media that remains in the same location as backed-up systems is adequate for data recovery purposes, but completely inadequate for disaster recovery purposes: any event that physically damages information systems (such as fire, flood, hazardous chemical spill, and so on) is likely to also damage backup media To provide disaster recovery protection, backup media must be stored off-site in a secure location Selection of this storage location is as important as the selection of a primary business location: in the event of a disaster, the survival of the organization may depend upon the protection measures in place at the off-site storage location
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