Resiliency

Automation / Scripting

• Reduces risk through repeatable processes and automated courses of action.

• Leveraging sophisticated monitors and sensors / continuous monitoring.

• Configuration Validation - ensures that new equipment has all the proper settings, applications, and drivers as existing equipment through automation and scripting.

• Operating system scripting languages:

  • Linux Shells: Bash, Ksh

  • Windows: PowerShell

Master Image

• AKA 'Gold' Image.

• Creating a model OS verified as 'clean'.

• Used for system restores.

• Needs to be secured.

Managing Cloud Risk

• Nonpersistence - Temporary system images. Snapshot of a known, good state.

• Elasticity / Scalability - Adjusting resources as needed.

• High Availability (HA) - The measures, such as redundancy, failover, and mirroring, used to keep services and systems operational.

• Redundancy - Replicating systems usually at multiple sites. Associated with failover.

• Distributive Allocation / Load Balancing - Distributing burden across multiple systems.

Fault Tolerance

• The ability of a system to sustain operations in the event of a component failure.

• Two key components: spare parts and electrical power.

• Power Protection:

  • Surge Protection

  • Uninterruptible Power Supply (UPS)

  • Backup Power / Generators

RAID Storage

• Redundant Array of Inexpensive Disks

• Focuses on availability of data.

• RAID Types

  • 0 - Disk Striping

  • 1 - Disk Mirroring

  • 3 - Disk Striping with a Parity Disk

  • 5 - Disk Striping with Parity