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

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