Intel AFCSASRISER User Guide - Page 28

RAID 60 - Combination of RAID 0 and RAID 6, Table 7. RAID 50 Overview

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Uses Strong Points Weak Points Drives Table 7. RAID 50 Overview Appropriate when used with data that requires high reliability, high request rates, high data transfer, and medium to large capacity. Provides high data throughput, data redundancy, and very good performance. Requires 2 to 8 times as many parity drives as RAID 5. 6 to 32 RAID 50 RAID 5 Set RAID Adapter Stripe Set ABCDEFGHIJK Available Capacity N=# disks C = Disk Capacity Available Capacity = (N*C)(N-1) /N A E P(I+K) C P(E+G) I P1(A+C) G K B F P(J+L) D P(F+H) J P1(B+D) H L RAID 5 & Data Striping RAID 50 Figure 7. RAID 50 - Combination of RAID 5 and RAID 0 RAID 60 - Combination of RAID 0 and RAID 6 RAID 60 provides the features of both RAID 0 and RAID 6, and includes both parity and disk striping across multiple arrays. RAID 6 supports two independent parity blocks per stripe. A RAID 60 virtual disk can survive the loss of two disks in each of the RAID 6 sets without losing data. RAID 60 is best implemented on two RAID 6 disk groups with data striped across both disk groups. RAID 60 breaks up data into smaller blocks, and then stripes the blocks of data to each RAID 6 disk set. RAID 6 breaks up data into smaller blocks, calculates parity by performing an exclusive-or on the blocks and then writes the blocks of data and parity to each drive in the array. The size of each block is determined by the stripe size parameter, which is set during the creation of the RAID set. RAID 60 supports up to 8 spans and tolerates up to 16 drive failures, though less than total disk drive capacity is available. Each RAID 6 level can tolerate two drive failures. Table 8 provides an overview of RAID 60. 16 Intel® RAID Software User's Guide

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16
Intel
®
RAID Software User’s Guide
Table 7. RAID 50 Overview
Figure 7. RAID 50 - Combination of RAID 5 and RAID 0
RAID 60 - Combination of RAID 0 and RAID 6
RAID 60 provides the features of both RAID 0 and RAID 6, and includes both parity and disk
striping across multiple arrays. RAID 6 supports two independent parity blocks per stripe.
A RAID 60 virtual disk can survive the loss of two disks in each of the RAID 6 sets without
losing data. RAID 60 is best implemented on two RAID 6 disk groups with data striped across
both disk groups.
RAID 60 breaks up data into smaller blocks, and then stripes the blocks of data to each RAID
6 disk set. RAID 6 breaks up data into smaller blocks, calculates parity by performing an
exclusive-or on the blocks and then writes the blocks of data and parity to each drive in the
array. The size of each block is determined by the stripe size parameter, which is set during the
creation of the RAID set.
RAID 60 supports up to 8 spans and tolerates up to 16 drive failures, though less than total
disk drive capacity is available. Each RAID 6 level can tolerate two drive failures.
Table 8
provides an overview of RAID 60.
Uses
Appropriate when used with data that requires high reliability, high request
rates, high data transfer, and medium to large capacity.
Strong Points
Provides high data throughput, data redundancy, and very good
performance.
Weak Points
Requires 2 to 8 times as many parity drives as RAID 5.
Drives
6 to 32
RAID Adapter
ABCDEFGHIJK
RAID 5
&
Data Striping
RAID 50
Available Capacity
N=# disks
C = Disk Capacity
Available Capacity =
(N*C)(N-1) /N
Stripe Set
RAID 5 Set
A
E
P(I+K)
C
P(E+G)
I
P1(A+C)
G
K
B
F
P(J+L)
D
P(F+H)
J
P1(B+D)
H
L
RAID 50