New setup, adding disks?

[Bushibot]

I have a new unraid setup 6.12.3.

3x8T disks and a 850G ssd for caching pool.

I assume two data, one for parity?

I have to other 4T drives, I wanted to add them too, would I want to make one a second parity drive and one data?

[itimpi]

11 minutes ago, Bushibot said:

I have to other 4T drives, I wanted to add them too, would I want to make one a second parity drive and one data?

No data disk can be larger than the smallest parity drive so since you would already have 8TB drives in the array you could only add the 4TB drives as data drives.

[Bushibot]

Oh I see I didn’t realize that applied to both data disks. So really I would need another 8 to support the two 4T’s? Or something similar

[dboonthego]

 

43 minutes ago, Bushibot said:

I would need another 8 to support the two 4T’s

No.  You'd need an 8TB to support 2nd parity.  You can still add the 4TB disks without having 2nd parity.  You can't add 2nd parity with anything less than 8TB because you have a data disk that is 8TB.

 

You can turn one of your 8TB data disks into the 2nd parity and add the 2 4TB to the array.  You will still end up with 16TB capacity.