HP D5970A - NetServer - LCII Configuration Manual page 23

Chapter 2
Table 2-1. RAID Level Summary for RAID Levels 0 to 5
RAID Level RAID 0
striping
Also Known As
no
Fault Tolerance
Redundancy none
Type
Hot Spare no
Option
one or more
Disks Required
greatest
Usable
Capacity
Capacity none
Reduction
Read fast (depends on
Performance number of disks)
fastest
Random Write
Performance
fastest
Sequential
Write
Performance
Rapid reads and
Typical Usage
writes with no
need for fault
tolerance
RAID 1 RAID 3
mirroring striping with
dedicated parity
yes yes
duplicate parity
yes yes
two three or more
least intermediate
50% capacity of one
disk
intermediate fast
intermediate slowest
intermediate slow
Mostly small Mostly large,
random writes serial transfers
with fault with fault
tolerance tolerance
RAID Overview
RAID 5
striping with
distributed parity
yes
parity
yes
three or more
intermediate
capacity of one
disk
fast
slow
slowest
Mostly small,
random transfers
with fault
tolerance
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