Need help determining best drive configuration.

[muuu]

Hi.

As of now I got 2x2TB and 1x1TB drives, and I'm only getting 1.8TB free space using ZFS RAID-Z.

So I'm wondering if I should replace the 1TB drive(Only got 3 sata ports) whit another 2TB drive?

I'm having a hard time figuring out what to do, and would appreciate some help.

 

[Durkatlon]

Yes, in RAIDZ the smallest drive determines how much of each drive can be used. So you are effectively running a (3-1)*1TB = 2TB array, where you lose some additional space because of filesystem overhead etc. The 1.8TB makes sense. If you replaced the 1TB with a 2TB, you'd get (3-1)*2TB-overhead = 3.8TB or so..

 

[muuu]

Yes, in RAIDZ the smallest drive determines how much of each drive can be used. So you are effectively running a (3-1)*1TB = 2TB array, where you lose some additional space because of filesystem overhead etc. The 1.8TB makes sense. If you replaced the 1TB with a 2TB, you'd get (3-1)*2TB-overhead = 3.8TB or so..

Thanks for the info.

Having the 1TB drive ind the array makes no sense anyway, as I will get the same capacity and redundancy(Or almost) by mirroring the two 2TB drives.