Can You add a disk in to a existing Raid?

[bdacasc]

Hi,
If I have three disks in a raid set in the latest version of Freenas can I add additional drives without destroying the already installed raid setup?
Is it just to add disk? Is there something I should consider when I do it?

I ask this since I am about to buy disk to my system but my wallet does not agree with me to get all disks at once.
If I could convince my wallet to get three disk now I might convince the wallet in later stage to get additional three more disk. :)

Will I then need to rebuild it all from scratch?

 

[Joshua Parker Ruehlig]

A raid (z or z2) is a vdev. You CANNOT change the amount of disk in a vdev once it is created.

You either need to rebuild it later (moving your data to backup disks) or get everything you need now.

 

[peterh]

a vdev ( thebuilding block of a zfs pool ) cannot be modified ( ie added one more disc ) after creation.
You may add another vdev to an existing pool, and the new vdev does not be identical to the existing (
adding a vdev with differing characteristics is most likley a mistake and may be dangerous however)

In your case your only (sane) option is to add a new vdev consisting of 3 disks in a raidz config.