Cloud+ Outline – Module 2

April 14, 2017 | Views: 2089

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Module 2: Storage Device Configuration Part 1

Unit Overview

 

Storage Types and Configuration

  • Tiering
  • Redundant Array of Independent DIsks (RAID)
  • File System Types

Disk Types and Configurations

Removable Media – 1

  • Interface Type
  • Access Speed
  • Solid-State Drive (SSD)
  • USB Drive
  • Tape

 

Removable Media – 2

  • Disks
  • Floppy Disk
  • USB drive
  • Can be fixed or removable

 

Interface Types

  • Advanced technology attachment (ATA)
  • Integrated device electronics (IDE)
  • Serial ATA (SATA)
  • Serial attached SCSI (SAS)
  • Small computer system interface (SCSI)

Access Speed

  • Hard Disk Speed
  • Latency (the higher the speed, the worse it is for network)
  • Access Time

Solid-State Drive (SSD)

  • Contains no moving parts
  • High-performance storage device

USB Drive

  • Plug and play removable storage
  • Assigned a drive letter on Windows OS
  • Powered by the USB port if small
  • Requires an external power supply for larger hard drives
  • Best for temporary transfer and storage

Tape

  • Requires a device to read the magnetic tape
  • Used primarily for backup data
  • Primarily a means of keeping monthly or yearly full backups
  • Slow seek time
  • Used for off-site storage

 

Tiering

Performance Levels of Each Tier

Policies

 

Performance Levels of Each Tier

Tier 1 – Mission Critical

Performance capacity, reliability and manageability

Tier 2 – Major business applications

Needs to be reasonable fast

Tier 3 – Financial Data

Not accessed often, inexpensive

Tier 4 – Stores e-mails or data for long periods

Large amounts of data, can be slower than the others

 

Policies

  • Used for fitting data in each tier
  • Policy to migrate between tiers
  • Provide guidelines to manage the organization’s data
  • Service License Agreement (SLA)

 

Module 2: Storage Device Configuration Part 2

Redundant Array of Independent Disks (RAID)

RAID 0, 1, 0+1, 1+0 or 10, 5, 6

 

RAID 0

Striped – each drives max storage, no fault tolerance, performance only.

A1 A2 (½ application on A1, the other half on A2)

A3 A4

 

RAID 1

Mirrored – each drive is mirrored, ½ amount of storage

A1 A1

A2 A2

 

RAID 0+1

Stripe, then mirror Reliability and performance

A1 A2 A1 A1

 

RAID 1+0

Mirror, then stripe

A1 A1 A1 A1

 

RAID 5

Block-level striping with distributed parity

(i.e. 100 Gb split 4 ways, but last 25 Gb used for parity)

A1 A2 A3 Ap

B1 B2 Bp B3

C1 Cp C2 C3

Dp D1 D2 D3

Lose one hard drive and keep going

 

RAID 6

Block-level striping with distributed parity AND an additional parity block

A1 A2 A3 Ap Aq

B1 B2 Bp Bq B3

C1 Cp Cq C2 C3

Dp Dq D1 D2 D3

Lose two hard drives and keep going

 

File System Types

  1. Byte Sizes
  2. UNIX File System
  3. New Technology File System
  4. File Allocation Table
  5. Virtual Machine File System
  6. Z File System
  7. Extended File System

Byte Sizes

  • 1024kB kilobyte
  • 1024MB megabyte
  • 1024GB gigabyte
  • 1024TB Terabyte
  • 1024PB petabyte
  • 1024EB exabyte
  • 1024ZB zettabyte
  • 1024YB yottabyte

Unix File System

  • Primary file system for UNIX-based OS
  • Uses a hierarchical file structure
  • Top level is called the root (/)
  • Max volume: 1 YB
    • Max Files Size 32 PB
    • No Encryption

New Technology File System

  • Created by Microsoft
  • Supports features such as
  • Compression
    • Volume Shadow Copy Service (VSS)
    • Encrypting File System (EFS)
    • Quotes
      • Max Volume: 256 TB
      • Max Files Size: 16 TB
      • Yes Encryption

File Allocation Table (FAT)

  • Legacy Files system
    • Used primary by removable media
    • Does not support feature for permissions and encryption
      • Max Volume: 2TB
      • Max File Size: 4GB
      • No Encryption

Virtual Machine File System (VMFS)

  • Used with VMWare ESX server and Vsphere
  • Storage disk images and snapshots in a file
  • Allows servers to read and write simultaneously
  • Max Volume: 64 TB
  • Max Files Size: 2TB
  • No Encryption

Z File System

  • Created by Sun Microsystems
  • File system and logical volume manager
  • Protects against data corruption
  • Supports high-storage capacities
  • Max volume 16 EB, Max files size 16 EB, no Encryption

Extended File System (EXT)

  • First file system created specifically for Linux
  • Bawesd for UNIX File System
  • Default file system for most Linux Distribution
  • EXT2, EXT3, EXT4
  • Max Volume: 1 YB, Max Files Size: 32 PB, No Encryption

Summary Overview

Described Storage Types and Configurations

Described Tiering

Described Redundant Array of Independent Disks (RAID)

Described File System Types

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