How is RAID 6 calculated?
RAID 6 uses two parity blocks per data stripe. That translates as effectively two disks worth of parity data, meaning that the amount of usable capacity is 3 TB, with 2 TB being unavailable. To calculate the capacity utilization as a percentage, we do: capacity utilization = (usable capacity / total capacity) * 100.
How much space do you lose with RAID 6?
In contrast, a RAID 6 array is designed to protect against two simultaneous disk failures. However, the price for this extra protection is that two disks' worth of capacity is lost to overhead. As such, a RAID 6 array made up of five 10TB disks would have a usable capacity of 30TB because 20 TB is lost to overhead.
How to calculate RAID size?
Therefore, the usable capacity of a RAID 5 array is (N-1) x S(min) , where N is the total number of drives in the array and S(min) is the capacity of the smallest drive in the array.
What is the raid calculator?
This RAID calculator will eliminate any confusion you have about which RAID level to choose ( RAID - Redundant Array of Inexpensive/Independent Disks ). It explains each of the commonly used RAID configurations and compares them based on storage size, RAID performance, fault tolerance, and cost.
How does RAID 10 work?
RAID 10 naturally only works with an even number of disks and always has a usable capacity of 50%. Theoretically, maximum read performance is a multiple equal to the number of drives in the array, and the write performance is a multiple equal to half the number of disks (since the RAID writes each block twice).
What are the supported RAID levels?
Supported levels are: RAID 0, RAID 1, RAID 1E, RAID 4, RAID 5, RAID 5E/EE, RAID 6, RAID 10, RAID 50, and RAID 60. What is RAID? How to calculate RAID capacity? Do I still need a backup? The calculator inputs are straightforward: RAID type, drive capacity, cost, drives per RAID and number of RAID groups.