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Flashcards in Redundancy Deck (10):

Raid 0

Not fault tolerant

Dats is striped across multiple disks to increase performance

Minimum amount of disks needed : 2


Raid 1

Fault tolerant
A redundant disk is created (mirror copy)

If one disk fails the other continues to operate

Only uses 2 disks


Raid 5

Striping with parity
Fault tolerant

Minimum amount of disks : 3
Data is striped across multiple disks,

a parity is also written to each disk. This allows the array to reconstruct data if one of the disks fails.

Example: you have 3 disks A, B and C

If B fails , the parity allows A and B to reconstruct the data that was on C


Raid 10

Fault tolerant
Minimum amount of disks : 2 but normally uses 4

Combines advantages of raid 1 and raid 0

Has at least 2 disks that are mirrored and then striped


Failover cluster

Aka high availability cluster

Designed so that a secondary server can take over Incase the primary fails.

Reduces the chance of a single point of failure

Example of use : two Microsoft a Domain controllers (a spare ready to go in case one fails )


Load balancing cluster

Multiple computers/servers connected together for the purposes of sharing resources such as cpu, ram, hd.

The load is literally balanced across the servers, this increases the performance


Hot site

Cold site

Warm site

Hot- up and ready to go, no configuration required (high availability HA) this is expensive but it is the only site that can facilitate (make easy) a full recovery

Warm- has the equipment may require configuration before users can work on them. May have backups that need to be restored.
This is a good option because the downtime is less than starting from scratch and it isn’t as expensive as a hot site

Cold- has tables and chairs, maybe some phones but everything else needs to be set up and configured. This is the cheap option but there is a lot of downtime. Downtime can equal lots of lost revenue (money)


Grandfather father son backup

Backups are taken daily , the newest backup is the son (usually daily )

The weekly backup is the (father)

Monthly backup (grandfather )

A son will be promoted to father at the end of the week

At the end of the month the father will become grand father

Once the father becomes the grandfather st the end of the month the old grandfather stored somewhere (off-site archive or tape)


Towers of Hanoi

Based on math,

I don’t really know much else or understand it


Business continuity plan (BCP)

Defines how a business will continue to operate if a disaster occurs

Consists of:

Business impact analysis- examination of critical vs non critical functions

Recovery time objective (RTO)- acceptable amount of time it will take to restore services

Recovery point objective (RPO)- the acceptable latency of data, or how much data is allowed to be inaccessible after a disaster