After three years, the original 3.6TB (3 x 2TB HDD) SHR raid (Synology Hybrid RAID) has finally been reduced to less than 50GB of free space. So with the price of a 4TB drive about the same bang for buck as even a 2TB drive I decided to go and grab one and see how this hot swappable disk expansion works. This was the exact reason I decided to get this NAS solution, expandable storage with different size hard drives providing RAID and disk fail protection. I could wait until I needed to add storage space (and when it became cheaper) before adding more, rather than filling the NAS with equal size hard drives (with less total space down the line) and having to do a lot more fiddling with it, although I do wonder what would happen if the biggest drive (in this case the 4TB) had an issue and needed to be replaced. Having thought about that, I suppose with 10TB of hard disk, the free space on the volume is equivalent to 10TB minus the largest disk, so in my case 6TB, therefore the 4TB could be removed without problem, I guess they thought of everything (except what do I do in this scenario if two disks die?).
Well, now that the deed is done, I can go over what happened, if you didn’t work it out from the picture gallery I will explain it step-by-step:
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