• Drive caching
• Stripe size selection
RAID technologies
Selecting the right RAID type for your IT infrastructure
The RAID setting that you select is based upon the following:
• The number of parity groups that you have
• The fault tolerance required
• The write performance required
• The amount of usable capacity that you have
Configuring the RAID fault tolerance
If your IT environment requires a high level of fault tolerance, select a RAID level that is optimized for fault
tolerance.
This chart shows the relationship between the RAID level fault tolerance and the size of the storage array.
The chart includes RAID 0, 5, 50, 10, 6, and 60. It also shows the percent reliability in increments
between 1 and one billion and the storage array drive increments between 0 and 96.
This chart assumes that two parity groups are used for RAID 50 and RAID 60.
This chart shows that:
• RAID 10 is 30,000 times more reliable than RAID 0.
• The fault tolerance of RAID 5, 50, 6, and 60 decreases as the array size increases.
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