Installation and configuration of the HP NetRAID, NetRAID-1 and NetRAID 3Si Adapters

Chapter 2 RAID Overview
24
Table 2-2. RAID Level Summary for Spanned Arrays
RAID Level RAID 10 RAID 30 RAID 50
Also Known As
striping with
mirrored arrays
striping with
dedicated parity drives
striping 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, 15, 18, 21, or 24
*
12, 16, 20, or 24
*
6, 8, 10, 12, 14, or 16
*
9, 12, 15, 18, 21, or 24
*
12, 16, 20, or 24
*
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 per adapter depends on the number of channels and
types of enclosures being used. Internal channels support a maximum of six devices, and
external channels support a maximum of six to eight devices.