Adaptec ASR-8405 SGL — преимущества и особенности массивов RAID 6 и RAID 60 [84/117]

Adaptec ASR-8405 SGL [84/117] Use this table to select the raid levels that are most appropriate for the logical drives on your storage space based on the number of available disk drives and your requirements for performance and reliability
RAID 6 Arrays
A RAID 6 array—also known as dual drive failure protection—is similar to a RAID 5 array because it uses
data striping and parity data to provide redundancy. However, RAID 6 arrays include two independent
sets of parity data instead of one. Both sets of parity data are striped separately across all disk drives
in the array.
RAID 6 arrays provide extra protection for your data because they can recover from two simultaneous
disk drive failures. However, the extra parity calculation slows performance (compared to RAID 5 arrays).
RAID 6 arrays must be built from at least four disk drives. Maximum stripe size depends on the number
of disk drives in the array.
Unused Space = 150 GB
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
250 GB
250 GB
400 GB
400 GB
Drive Segment Size
(Smallest Disk Drive)
Disk Drive 2
Disk Drive 3
Disk Drive 4
Disk Drive 1
Unused Space = 150 GB
Disk Drives in Logical Drive
Based on the drive segment sizes used:
(P1 & P2)
RAID 6 Logical Drive = 500 GB plus parity
P21 P1 . . .
4492 P2 . . .
P1P1 3 . . .
500P2 4 . . .
RAID 60 Arrays
Similar to a RAID 50 array (see RAID 50 Arrays on page 83), a RAID 60 array—also known as dual drive
failure protection—is built from eight disk drives congured as two or more RAID 6 arrays, and stripes
stored data and two sets of parity data across all disk drives in both RAID 6 arrays.
Two sets of parity data provide enhanced data protection, and striping improves performance. RAID 60
arrays also provide high data transfer speeds.
Comparing RAID Levels
Use this table to select the RAID levels that are most appropriate for the logical drives on your storage
space, based on the number of available disk drives and your requirements for performance and reliability.
Minimum
Disk Drives
Built-in Hot
Spare
Write P
erformance
Read P
erformance
Disk Drive
Usage
RedundancyRAID Level
2No******100%NoRAID 0
84Proprietary and Condential to PMC-Sierra, Inc.
Document No.: CDP-00283-04-A Rev. A, Issue
Serial Attached SCSI RAID Controllers Installation and User's Guide

Содержание

Узнайте о RAID 6 и RAID 60: их преимущества, защита данных, производительность и требования к дискам. Идеальный выбор для надежного хранения информации.

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