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Security + || 5.2 Disaster Recovery and Resiliency
Security + || 5.2 Disaster Recovery and Resiliency
27
Computer Science
Undergraduate 4
12/12/2018

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Cards

Term
Resiliency
Definition
Failover to alternate processing site (or system)

oPlan this process meticulously

oRestore systems to secure configuration
Term
Cold Site (Failover System)
Definition
Not ready to go.

Cheap.

Somewhat difficult to start up.
Term
Warm Site (Failover System)
Definition
Has some network devices, but isn't quite ready to start up.

Expensive.
Term
Hot Site (Failover System)
Definition
An exact clone or duplicate of your current system.

Very expensive.
Term
Testing Disaster Recovery Steps
Definition
•Tabletop exercises

•Simulations

•Review and update plans

•Notify Important Stakeholders and Customers
Term
After-action Report
Definition
AAR
Term
Resiliency Strategies
Definition
•Minimize or eliminate Single Points of Failure

•IT Contingency Planning

•Provide systems that are high availability and fault tolerant
Term
Redundancies
Definition
Systems and procedures that can provide the same (or nearly) level of service despite “incidents”
Term
Scalability
Definition
The costs involved in supplying the service to more users are linear
Term
Elasticity
Definition
System's ability to handle changes in demand in real time
Term
Distributive Allocation
Definition
Ability to switch between available processing and data resources to meet service requests
Term
Recovery Sites
Definition
Alternate processing sites provide redundancy for damage to resources stored on the primary site
Term
RAID 0
Definition
oStriping with parity

oNo fault tolerance
Term
RAID 1
Definition
oMirroring (2 disks / 1 controller)

oDuplexing (2 disks and controllers)
Term
RAID 5
Definition
Striping with distributed parity
Term
RAID 6
Definition
Striping with double parity
Term
RAID 0+1 / RAID 1+0 (RAID 10)
Definition
Mirror of stripes or stripe of mirrors
Term
RAID 5+0 (RAID 50)
Definition
RAID5 sets striped across a RAID0 set
Term
Fault Tolerance
Definition
How much a fault in recovery/resiliency can be tolerated.
Term
Synchronous (Replication Between Sites)
Definition
(must be written at both sites – expensive)
Term
Asynchronous (Replication Between Sites)
Definition
(one site is primary / master and the others secondary)
Term
Order Of Restoration
Definition
•Enable and test power delivery systems (grid power, Power Distribution Units (PDU), UPS, secondary generators

•Enable and test switch infrastructure then routing appliances and systems

•Enable and test network security appliances

•Enable and test critical network servers

•Enable and test backend and middleware and verify data integrity.

•Enable and test front-end applications

•Enable client workstations and devices and client browser access
Term
Differential Backups
Definition
A security copy that contains only those files that have been altered since the last full backup.
Term
Incremental Backups
Definition
Back up since the last Back Up
Term
DR
Definition
Disaster Recovery
Term
Short term retention
Definition
Version control and recovery from corruption / malware
Term
Long term retention
Definition
Regulatory / business requirements
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