setting up drives

[ag3n7]

I have two 8TB drives and two 16TB drives. When I setup Unraid it choose the following array:

Parity: 16TB

Parity2: 16TB

Disk1: 8TB

Disk2: 8TB

 

I feel that I should configure the following way to get the most space possible:

Parity: 16TB

Parity2: 8TB

Disk1: 16TB

Disk2: 8TB

 

Does that make sense? Or is this a bad idea.

[Vr2Io]

Parity ( single or dual ) must be the biggest disk.

[itimpi]

The only way with that combination of drives to get extra space would be to run with a single 16TB parity drive (and thus only protected against a single drive failure) and have 3 data drives.  Not necessarily a bad a idea with that few drives as the chance of two simultaneous failures are low but it depends on your tolerance for risk.

 

As was mentioned no parity drive can be smaller than the largest data drive.

[JonathanM]

16 hours ago, ag3n7 said:

Does that make sense?

2 parity disks allow the failure of any 2 disks simultaneously without losing data.

 

If you could arrange it the way you propose, then if both 16TB drives died, you would lose the information on the 16TB data drive, with no recovery possible.