RAID

RAID 

-Physical disk drive set viewed as a single logical unit

 

 

RAID 0

bit stripping / No parity

디스크 드라이브 마다 strip을 나눠서 할당

EX)디스크가 4개면 스트립을 4개로 할당하여 한번에 읽음 

      근데 이중 디스크 하나가 고장나면 한번에 읽어야되는데 못읽게됨

 

Benefit

-Device appear as one logical unit

-Best for large data quantity: non-critical data(별로 안 중요한 데이터)

 

RAID 1

Mirroring 

 

 

RAID 4

블록 단위로 분산

 

stripping / parity strip 

 

Avoid level 4 bottleneck 

Complicated to regenerate data from failed device

Parity strip are distributed amont the disk

 

RAID 5

블록 단위로 분산

RAID 4와 유사

Parity 분산 저장 (Distribute partiy strips across disks)

 

Avoid level 4 bottleneck 

 

disAdv

-Complicated to regenerate data from failed device.

 

RAID 6

블록 단위로 분산

 

Two different parity calculations

Parities stored on separate disk across array

 

adv

-data restoration even if two disks fail

 

 

 

Nested RAID Levels

 

-Combines multiple RAID levels

Some common nested RAID configurations, always indicated with two numbers that signify the combination of levels. For example, neither Level 01 nor Level 10 is the same as Level 1.

 

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