Question about RAIDZ2

[Kitzul]

Hello,

I have 8x2TB hard drives which I have setup in RAIDZ2. According to this calculator I should have 10.9TB usable however I only have 6.9TB available
http://www.servethehome.com/raid-calculator/

From what I was reading RAIDZ2 works best with 6 or 10 drives.

My question is if I go from 8 to 10 drives will I gain the lost space back? According to the calculator listed above with 10 drives I should have 14.6 TB usable.

Second question if in fact going to 10 drives would fix my missing space issue, can I expand the volume or would it have to be reacreated?

Thanks in advance.

 

[cyberjock]

No, you need to figure out where the missing space is before you go throwing more drives in. Post the output of zpool status in pastebin.

 

[Kitzul]

[root@freenas-01 ~]# zpool status Vol-01
pool: Vol-01
state: ONLINE
scan: none requested
config:

NAME STATE READ WRITE CKSUM
Vol-01 ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
gptid/d0c24359-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
gptid/d136130a-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
gptid/d1abbecc-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
gptid/d223f8f1-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
raidz2-1 ONLINE 0 0 0
gptid/d29befb3-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
gptid/d3133c7f-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
gptid/d38b3bbc-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0
gptid/d40720d3-20bb-11e4-86d1-0014d11c224e ONLINE 0 0 0

errors: No known data errors


So I guess it created 2 RAIDz2 with 4 disks each rather than 1 large one. Guess that makes sense as to where the space went. I jsut used the ZFS Volume Manager and added all available disk without much though. I shall see if I can recreate it as 8x1 rather than 4x2

Thanks

 

[cyberjock]

Exactly right. Make it one big vdev and everything will be fine.