QNAP Systems, Inc. - Network Attached Storage (NAS)

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Why is the disk size of the Turbo NAS reduced after RAID configuration completes?

Applied Models:

Answer:

  1. Depends on the RAID type, the available space is different.
    * When configuring two disks as RAID 1, the disk size usable is equal to the smallest disk size of one disk.
    * When configuring N disks as RAID 5, the disk size usable is equal to the size of (N-1) disks, using the size of the smallest disk.
    * When configuring N disks as RAID 6, the disk size usable is equal to the size of (N-2) disks, using the size of the smallest disk.
  2. Hard disk manufacturer calculates disk size as 1M=1000,000 while computer calculates actual disk capacity as 1M=1024x1024. When a manufacturer marks a disk size as 2TB (disk size: 2TB=2,000GB=2,000,000MB=2,000,000,000KB=2,000,000,000,000), the actual usable disk capacity could be 2,000,000,000,000/1024/1024/1024/1024 = 1.81TB. Therefore when configuring 8x 2TB disks as RAID 5, the total capacity will be 1.81TB x (8-1) = 12.73TB.
  3. The Turbo NAS stores configuration and system files on the hard disk. It will take about 1.5GB storage space on each disk.
  4. After being formatted with ext3/ext4 file system, the file system takes about 1% to 2% of total volume space.
Release date: 2013-04-19
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