This expansion math is giving me a head-ace .... and Im actually not that bad in math. Anyway, I have a 6 bay ReadyNAS Pro Business with Raidiator 4.2.24
I wanted to do some expansion on my disks that were 3+3+3+3+3+4=19 and with X-Raid2 gave me 13 TB to play with. Then I upgraded all my disks to 5x4TB = 20TB ...... but that only gave me 10TB ?? ... with X-Raid2 and Dual Redudancy suddenly ? Not much of an upgrade .... 😮
I have another 4TB I can shove in, but if that will only give me 2TB in total, its just not enough.
I have tried to read many posts in here .... and that’s where the Head-Ace come in :shock:
Will I get more space by starting out with only 4x4TB and then expand with 2x4tb right after ? It just doesent make sense ..... or maybe it does if you have a head for it
For dual redundancy, you subtract the two largest drive capacities from the total. For single redundancy, you subtract the largest drive capacity from the total.
5x4TB with dual redundancy gives you a ~10.9 TiB volume (12 TB). If you add one more drive, it would go up to 14.5 TiB (16 TB). TiB = "power of two" terabytes, which is what the NAS (and windows) reports.
And yes, that is about the same storage as you had to begin with. The gain in this case is having dual redundancy, not really the space.
Did you want dual redundancy? If not, go with 6x4 TB (all at once) and do a factory reset. That will get you 20 TB. Note you can't expand across the 16 TiB threshold. That's why you'd want to do all 6 at once.
