Group 2 Bernard Smith Thomas Laborde Hannah Prather Fault Tolerance Environment Power Topology and Connectivity Servers Hurricane Preparedness Network Edition Guide

Hurricane Preparedness: Fault Tolerance Power Environment Section 1: Fault Tolerance, Environment, and Power 1

Hurricane Preparedness: Fault Tolerance Power Environment Data Protection Plan: Excessive Heat Moisture Break-ins National Disasters Prevention: Locked doors Air conditioning Maintained at constant humidity. Power Power Flaws: Surge Noise Brownout Blackout Fault Tolerance The capacity of a system to continue performing despite an unexpected hardware or software malfunction. Fault vs Failure 2

Hurricane Preparedness: Fault Tolerance Power Factors to consider in deciding which UPS is right for you: UPS (Uninterruptible Power Supplies) Generators 4 Amount of Power Needed (volt-amps) Period of time to keep a device running Line Conditioning Cost OnlineStandby What type of generator do we need? Diesel? Steam? natural gas? liquid propane gas? 3

Hurricane Preparedness: Fault Tolerance Power Figure 14-2 UPSs and a generator in a network design Generators typically are combined with UPSs to ensure clean power is always available 4

Hurricane Preparedness: Fault Tolerance Power Environment Section 2: Topology and Connectivity 5

 LAN- a star topology  WAN- full-mesh topology  SONET  T1 link Hurricane Preparedness: Fault Tolerance Contact Internet Service Provider and establish a Virtual Private Network Hurricane Preparedness: Fault Tolerance Power Topology 6 Determine your network’s needs Supply multiple paths for the data Concerns: Capacity Scalability

Hurricane Preparedness: Fault Tolerance Power 7 Connectivity Internet Failover Hot swappable Load balancing With many devices connected in one network, leaves more room for failure

Hurricane Preparedness: Fault Tolerance Power Environment Section 3: Servers 8

Advantage: each server can provide its own data processing -always ready to take over for failed server -reduces cost -improves performance Hurricane Preparedness: Fault Tolerance Power Server Mirroring Redundancy ensures fault tolerant servers 9 Clustering Servers NICs Processors Hard disks One device duplicates the activities of another Advantage: servers involved do not have to be next to each other Disadvantage: time consuming Links multiple servers together to act as a single server

Hurricane Preparedness: Fault Tolerance Power Environment Section 3: RAID 10

Hurricane Preparedness: Fault Tolerance Power Disk 1 Disk 3Disk 2 Disk 4 Disk Controller RAID drive 64 KB 128-KB file RAID Redundant Array of Independent Disks 1.A collection 2.Single disk Failure 3.Increase Storage 4.Better Disk Performance Level 0 1.Simple 2.64 bit blocks 3.No Redundancy 4.Multiple 5.Best Performance AKA Disk Stripping 11

Hurricane Preparedness: Fault Tolerance Power Disk 1 Disk 3Disk 2 Disk 4 Disk Controller RAID drive 128 KB 128-KB file - Disk - mirroring -Failed disk = Auto switch -Costly – identical disks Level 1 Software is taxing on the CPU 12

Hurricane Preparedness: Fault Tolerance Power Disk 1 Disk 3Disk 2 Disk 4 Disk Controller RAID drive 1 KB.33 KB 1 KB.33 KB 1 KB.33 KB Parity File 1 (3 KB) File 2 (1 KB) RAID Level 3 - Disk Stripping, Error Correction Code algorithm -Parity, integrity of data -Sum of data plus parity = odd or even -Written then read -Parity on one disk- could fail 13

Hurricane Preparedness: Fault Tolerance Power - Most Popular -Parity with error checking -Fault Tolerance Failed disk, software Disk 1 Disk 3Disk 2 Disk 4 Disk Controller RAID drive 4 KB File 1 (12 KB) File 2 (16 KB) Parity 4 KB Hot Spare – part of system, ready to go Cold Spare – not installed RAID Level 5 14

Hurricane Preparedness: Fault Tolerance Power Environment Section 4: NAS & SANS 15

Hurricane Preparedness: Fault Tolerance Power NAS (Network Attached Storage)SANs Storage Area Networks 1.Connected to a Network 2.Optimized for saving and serving files Must have a file server to interact 1.Communicates Directly 2.Mesh Topology 3.Most Fault Tolerant 4.Fiber Optics Multiple storage devices connected to multiple servers 16

Hurricane Preparedness: Fault Tolerance Any questions? Call Kari Walters for more information