Recommended Raid Configurations; With A Super-Capacitor - Inspur 3408 Series Configuration Manual

Table 1-1 Performance and Drive Space Utilization of Different RAID Levels
RAID Level
RAID 0
RAID 1
RAID 5
RAID 6
RAID 10
RAID 1E
RAID 50
RAID 60
Note: "N" is the total number of drives in a RAID array and "M" is the number of
sub-arrays in the RAID array.
1.4

Recommended RAID Configurations

The following policy settings apply to Broadcom and Microsemi RAID

controller cards. Recommended configurations for HDDs and SSDs are
provided respectively with performance or data security prioritized.
The configurations are for reference only. You can adjust them according to

your actual application.
The detailed configurations are described below.

1.4.1 With a Super-Capacitor

1. Optimal Performance Settings for HDDs
Broadcom RAID controller card:

Read Policy = Read Ahead
-
Write Policy = Write Back
-
IO Policy = Direct
-
Disk Cache = Enable
-
Microsemi RAID controller card:

Read
Reliability
Performance
Low High
High Low
Relatively
High
high
Relatively
High
high
High Medium
High Medium
High High
High High
Write
Performance
High
Low
Medium
Medium
Medium
Medium
Relatively high
Relatively high
6
Drive Space
Utilization
100%
50%
(N - 1)/N
(N - 2)/N
50%
(N + 1)/2N
(N - M)/N
(N - M × 2)/N