RAID STORAGE

Question 1

Redundant Array of Independent Disk

RAID

Answer 1

• Different RAID levels
  
  • Some redundant, some not
• RAID 0 = Striping
• RAID 1 = Mirroring
• RAID 5 = Striping with parity
• Nested RAID = RAID 1 + 0 (RAID 10)

Question 2

Software RAID

Answer 2

• A feature of the operating system
• Doesn’t require any special hardware
• Usually lower-performance than hardware based RAID

Question 3

Hardware RAID

Answer 3

-A feature of the hard drive controller

• Configured outside the OS
  
  • Usually invisible to operating syatem

-Higher performance, designed for speed

Question 4

RAID 0

Answer 4

-File blocks are split between TWO OR MORE physical drives

• High performance
  
  • Data written quickly
• No redundancy
  
  • Drive failure breaks the array

Question 5

RAID 1

Answer 5

-File blocks are duplicated between TWO OR MORE drives

• High disk utilization
  
  • Every file is duplicated
  • Required space is doubled
• High redundancy
  
  • Drive failure DOES NOT affect availability

Question 6

RAID 5

Answer 6

• Fire blocks are stiped
• Along with parity blocks
• Need at least 3 disk
• Efficient use of disk space / Files not duplicated
• High redundancy / Data available after fail

Question 7

RAID 1 + 0

RAID 10

Answer 7

• The speed of striping & redundancy of mirroring

- Needs at least 4 drives