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Disaster Recovery : Types Of Replication Methods , Retention And Destruction

Media types used for backup of data-transfer

  • Tape: These include Magnetic tape, DAT (Digital Audio Tape), DLT (Digital Linear Tape).DAT (Digital Audio Tape) drives are also called 4 mm DAT. DAT tape is 4 mm in width. DAT tapes can store data any where between 2 GB and 24 GB(Gig Bytes). The data transfer speed is approximately 20MB/min. DLT (Digital Linear Tape) drives: DLT drives can store much larger capacity, to the tune of 70GB. Transfer speeds for DLT drives can be as high as 300MB per minute. Mammoth: This type of tape drive also have high data transfer capacity, and medium capacity.

  • Disks:these include optical disks and removable hard disks.

  • Optical: optical drive uses laser to read and write to compact disks and there is no contact between drive and the disk .This increase drive wear and longevity. These include CD-RW and recordable DVD

Rotation Schedules

  • Grandfather-Father-Son: In GFS, "Son" is the incremental or differential daily back-up, "Father" is the full weekly back-up, and "Grandfather" is the monthly full back-up.

  • Tower Of Hanoi: Multiple media sets are rotated through in incremental and full back-ups. It uses more media sets than GFS for increased safety.

5.2 Given a scenario, compare and contrast the different types of replication methods

Types of site

  • Hot Site: these sites allow continuous access to the server directly or remotely by backup facility to allow ongoing mirror operations of primary server. Speed of replication depends on distance between primary site and hot site.

  • Cold sites: These site allow periodic connection according to a specific schedule to copy the backup data.

  • Warm Site: It is a compromise between hot and cold. These sites will have hardware and connectivity already established, though on a smaller scale than the original production site or even a hot site. Warm sites will have backups on hand, but they may not be complete and may be between several days and a week old

Clustering:

To configure a clustered server environment, at least 2 servers are required.

All the following are true about clustering:

  • Clustering improves the availability of the network.

  • Processing load is distributed among the clustered servers.

  • Clustering allows for better scalability.

If one of the servers in a cluster fails, other server(s) in the cluster take over the entire load of the failed server without interruption to the services.

5.3 Explain data retention and destruction concepts

  • Backup : It is copy of data taken on a regular basis. Main purpose of taking backup is to restore data in case original data is lost or damaged.

  • Archive: It is collection of historical records. Main purpose of archiving is for future reference and long time retention.

5.4 Given a scenario, carry out the following basic steps of a disaster recovery plan

Disaster Recovery Planning is a practice in which organizations develop policies and procedures to ensure rapid restoration of computer systems and resumption of computer-based operations in the event of a systems disruption. In light of the essential role computers play in virtually all companies, DRP is a critical step in ensuring post-disaster business continuity.

Broadly, disaster recovery plan can be divided into:

  • Risk analysis

  • Establishment of budget,

  • Implementation and testing.

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