New NAS Capacity Issue?

Mar 30, 2018
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I just finished setting up my new NAS:

Synology 718+ with 2x 10TB WD Reds; SHR, Btrfs.

When creating a volume it shows both disk with a disk size of 9.1TB. When I went through the volume creation Wizard, the capacity listed I would get is around 9.09TB. However, once the volume was created, it shows the capacity being at 8.73TB. Is this normal or is there something I should be worrying about? Any advise/insight would be appreciated.
 
Solution
I would say yes its normal since you are not using the normal windows format;likely due to using the default Synology hybrid raid (shr)format.