Integrated HP NetRAID Controller Config. Guide

Chapter 2 RAID Overview
22
Table 2-2. RAID Level Summary for Spanned Arrays
RAID Level RAID 10 RAID 30 RAID 50
Also Known As
spanning with
mirrored arrays
spanning with
dedicated parity drives
spanning with
distributed parity
Fault Tolerance
yes yes yes
Redundancy
Type
duplicate parity parity
Hot Spare
Option
yes yes yes
Disks Required:
spans 2 arrays
spans 3 arrays
spans 4 arrays
4
6
8
*
6, 8, 10, 12, 14, or 16
*
9, 12, or 15
*
12 or 16
*
6, 8, 10, 12, 14, or 16
*
9, 12, or 15
*
12 or 16
*
Usable
Capacity
least intermediate intermediate
Capacity
Reduction
50% capacity of one disk for
each array spanned
capacity of one disk for
each array spanned
Read
Performance
intermediate fast fast
Random Write
Performance
intermediate slowest slow
Sequential
Write
Performance
intermediate slow slowest
Typical Usage
Mostly small
random writes
with fault
tolerance and
enhanced speed
Mostly large serial
transfers with fault
tolerance and enhanced
speed
Mostly small, random
transfers with fault
tolerance and enhanced
speed
*The maximum number of devices depends on the number of channels and types of
enclosures being used.