HP D5970A - NetServer - LCII Installation And Configuration Manual page 32

Chapter 2
Table 2-2. RAID Level Summary for Spanned Arrays
RAID Level RAID 10
striping with
Also Known As
mirrored arrays
yes
Fault Tolerance
Redundancy duplicate
Type
Hot Spare yes
Option
Disks Required:
4
spans 2 arrays
6
spans 3 arrays
*
spans 4 arrays 8
Usable least
Capacity
50%
Capacity
Reduction
intermediate
Read
Performance
Random Write intermediate
Performance
Sequential intermediate
Write
Performance
Typical Usage Mostly small
random writes
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.
24
RAID 30
striping with
dedicated parity drives
yes
parity
yes
*
6, 8, 10, 12, 14, or 16
*
9, 12, 15, 18, 21, or 24
*
12, 16, 20, or 24
intermediate
capacity of one disk for
each array spanned
fast
slowest
slow
Mostly large serial
transfers with fault
tolerance and enhanced
speed
RAID Overview
RAID 50
striping with
distributed parity
yes
parity
yes
*
6, 8, 10, 12, 14, or 16
*
9, 12, 15, 18, 21, or 24
*
12, 16, 20, or 24
intermediate
capacity of one disk for
each array spanned
fast
slow
slowest
Mostly small, random
transfers with fault
tolerance and enhanced
speed