Choosing A Raid Level; Fault Tolerance - Compaq 124708-001 - ProLiant Cluster - 1850 White Paper

New Advanced RAID Level for Today's Larger Storage Capacities:

Choosing a RAID level

Customers should consider a variety of factors when choosing which RAID level best suited for
their needs. These factors include:
1. Capacity utilization and budget;
2. Availability and Uptime requirements; and
3. Performance requirements.
Tables 2 and 3 help determine which RAID level best suits particular requirements.
Table 2. Choosing a RAID method.
MOST IMPORTANT
Cost Effectiveness
(cost per usable capacity)

Fault Tolerance

Performance
Table 3. RAID Level Decision Tree
13JE-1000A-WWEN
SECONDARY IMPORTANCE
Fault Tolerance
Performance
Cost Effectiveness
Performance
Cost Effectiveness
Fault Tolerance
RAID Level Decision Tree
NO
Fault
Tolerance
Higher
performance
RAID 0 RAID 1
YES
# of
2 8 or more
Disk Drives
3-7
Performance
Performance
vs. Capacity
vs. Capacity
Higher capacity
utilization
RAID 0+1 RAID 5
RAID LEVEL CHOICE
RAID ADG
RAID 5
(RAID 0 if fault tolerance is not
needed)
RAID ADG
RAID 0+1
RAID 5
(RAID 0 if fault tolerance is not
needed)
RAID 0+1
RAID ADG
5