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What is meant by Usable Disk Capacity?

April 26, 2017disk meant usable

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What is meant by Usable Disk Capacity?

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For RAID storage systems, there are measures of raw and usable capacity. For this exercise, we are looking at the Usable Disk Capacity measure as the amount of disk thas is needed to store the backup data. Typically in a RAID-5 or RAID-6 configuration, the usable capacity is about 70-80% of the raw capacity. This depends on things like the number of hot spare drives, the RAID configuration used and formatting of the disks for OS access.