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Forum Discussion
missing available disk space - after drive upgrade
This doesn't seem right... our NAS currently has the following drives 6TB+4TB+4TB+4TB+3TB+2TB = 23TB OS 6.2.1 RN716X RAID-5 with X-RAID2 but the available storage is only 14TB - so we are miss...
Well, no. Your analysis isn't quite correct.
vandermerwe wrote: See this:
http://ram.kossboss.com/xraid/
The nas needs to create redundant space, it can't use a small drive to create redundant space for a raid array that is using bigger drives. Effectively you have a raid 5 array of 6x2tb, a raid 5 array of 5x1tb, a raid 5 array of 4x1tb, and a raid 1 array of 2x1tb. The remaining 2 tb of the 6 tb disk is not being used as the nas cannot create redundant space.
With 6TB+4TB+4TB+4TB+3TB+2TB the layering is 6x2TB, 5x1TB and 4x1TB. There is no RAID-1 component. 2 TB is not being used on the 6 TB drive. This results in a 17 TB (or ~15.4 TiB) volume size.
But the OP is expecting that size, and is seeing about 1 TB less. That is why he's posting.
BTW, if he started with 2x1TB, then the layering would be 6x1TB, 6x1TB, 5x1TB and 4x1TB. Once created, the layers remain.
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