zpool setup config not as intended

[larzeb]

I have 6 2TB disks in a rackmount running on my second FreeNAS system. My intention was to setup 4 disks plus 2 hot spares in a raidz2 zpool. However, I believe I made a mistake.

# zpool status -v tank
pool: tank
state: ONLINE
scan: scrub repaired 0 in 0h22m with 0 errors on Sun Nov 9 00:22:02 2014
config:

NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
gptid/52f7ee90-24a7-11e4-87dd-002590ea7f96 ONLINE 0 0 0
gptid/5342d9f7-24a7-11e4-87dd-002590ea7f96 ONLINE 0 0 0
gptid/53892247-24a7-11e4-87dd-002590ea7f96 ONLINE 0 0 0
gptid/53ce79a3-24a7-11e4-87dd-002590ea7f96 ONLINE 0 0 0
gptid/5416adbb-24a7-11e4-87dd-002590ea7f96 ONLINE 0 0 0
gptid/545e92d3-24a7-11e4-87dd-002590ea7f96 ONLINE 0 0 0

errors: No known data errors​

What do I have to do in order to reconfigure this system as I originally intended? Do I copy all of the files off to a USB, destroy the zpool and start from scratch?

Thanks Larry

 

[danb35]

To change your configuration, yes, you'd need to destroy the pool and recreate it. However, FreeNAS doesn't support hot spares anyway, so it may not be worthwhile to do this.

 

[larzeb]

My hope was to have disk redundancy in case of a single disk failure in the zpool. Is this not possible in FreeNAS? If it is, what do I need to read in order to create it?

 

[danb35]

You have it--in fact, you have redundancy for two disk failures. What you don't have are hot spares--disks that will be pulled into the array if one of your disks fails.

 

[larzeb]

Thanks for that explanation. If one does fail, will the zpool still function but in a degraded state? Each of the 6 disks are removable.

 

[danb35]

Yes. If one or two disks fail, the pool will continue to function, though in a degraded state.