Duplexing uses a separate RAID controller card for each drive in the array. This will provide fault tolerance in the event of controller failure.
RAID-1 is the most expensive implementation for fault tolerance because it requires twice the amount of storage normally needed for all data written. RAID-1 is used where overall capacity is not the primary concern.
RAID-1 is well suited for financial applications, such as payroll, where data availability and performance are important. RAID-1 is often used for the boot device in servers. This type of RAID array should be used when cost and overall storage capacity are not as important as performance and fault-tolerance.
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