Knowledgebase: RAID Management
Why the capacity is smaller than it should be?
Posted by  NA , Last modified by on 11 January 2011 17:56


Basically, please refer to the following links,
This would be the ideal capacity of a RAID5 with 5 * 2TB disks. While you create a RAID5, the unit(*1) might use 95% capacity for data storage, and Thecus NAS might need keep some space for system and inode (http://en.wikipedia.org/wiki/Inode) fore file system, that is why you see the capacity is smaller than 7.45TB. About the capacity, 1. N disks 2TB JBOD = N*2 TB without redundancy 2. N disks 2TB RAID0 = N*2 TB without redundancy 3. N disks 2TB RAID1 = 2 TB 4. N disks 2TB RAID5 = (N1)*2 TB, at least 3 disks. 5. N disks 2TB RAID6 = (N2)*2 TB, at least 4 disks. 6. N disks 2TB RAID10 = (N/2) * 2TB, at least 4 disks. 7. N disks 2TB RAID50 = (N/2  1)*2TB * 2 = (N2) * 2TB, at least 6 disks. 8. N disks 2TB RAID60 = (N/2  2)*2TB * 2 = (N4) * 2TB, at least 8 disks. *1. N4100PRO or above, please check the specification.  

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