SOLVED "Add" Storage

[Theapplefuture]

Hello Everybody,

I just set up my FreeNAS Server a few weeks ago and of I course I haven't run out of storage yet ;)
But lets imagine I don't have any storage left, how can I "add" storage ?
I know that I can't just add a new HDD to my zpool but can I replace a 8 tb HDD with an empty 10 tb HDD ?
Because of RAID z2 it should automatically copy all my data to the new hdd right ?
So the question is do I need all HDDs to be the same size or can I for example use 3x 8 tb and 3x 10 tb HDD ?

Thanks for your time

 

[garm]

the usable space of a vdev is the smallest drive minus parity and metadata. So if you want to expand a vdev by replacing drives you need to replace all drives within a vdev. Vdevs are striped to make a pool so you can have different size vdevs, but it’s not ideal.

 

[nojohnny101]

@garm gave a good answer. we always point people new to ZFS and FreeNAS to this slideshow that explains the basic concepts very clearly:

https://forums.freenas.org/index.ph...ning-vdev-zpool-zil-and-l2arc-for-noobs.7775/