HD Expansion

[el_pedriyo]

Hello,

Just a quick question, it is supposed that to expand a pool for example 4 drives of 4TB to 4 drives of 10TB you just need to go 1 by 1 with the replacement option in freenas, but going 1 by 1 will make you mix 4TB drives with 10TB, I mean when you replace 2 of them, you will have a system of 28TB or will you still have 16TB and the 10TB drives will not be 100% usable until you complete changing all drives with the 10TB ones, also I am talking about a raidz. I should assume that all information from the 4TB drives will be copied to the 10TB ones, doesn't it?

Also, another question, is it possible to have a running 4 drives in raidz and expand it to 5, 6,7 or 8, etc drives?

Kind regards,
Pedro

 

[garm]

Yes

No it is not, not without rebuilding your pool

 

[danb35]

The capacity of RAIDZn vdevs is determined by the capacity of the smallest disk in the vdev. Thus, a vdev consisting of 3 x 10 TB disks and 1 x 4 TB disk will have the same capacity as if it were 4 x 4 TB. Once you replace the last 4 TB disk with a 10 TB disk, the capacity will increase.