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3ware® CLI Guide > Introduction to the 3ware Command Line Interface > Working with 3ware CLI > Determining What RAID Level to Use

Determining What RAID Level to Use
Your choice of which type of RAID unit (array) to create will depend on your needs. You may wish to maximize speed of access, total amount of storage, or redundant protection of data. Each type of RAID unit offers a different blend of these characteristics.
The following table provides a brief summary of RAID type characteristics.
 
This type of unit provides performance, fault tolerance, and high storage efficiency. RAID 5 units can tolerate one drive failing before losing data.
Provides very high fault tolerance with the ability to protect against two consecutive drive failures. Performance and efficiency increase with higher numbers of drives.
You can create one or more units, depending on the number of drives you have installed.
 
# Drives

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