zpool Size Clarification

[jbbender22]

I just set up my FreeNAS box and everything seemed to be running fine. I went through the wizard when I set it up and set up a Raidz2 with my 4TB WD Reds. I have 6 of them and the wizard told me I would have about 14.5 TB, which I expected a number around there.

This morning I was looking around the GUI and in the Storage Volumes screen I noticed my zpool size is way off from 14.5 TB. It shows as me having 20.4 TB available. I've attached a screenshot to show what I mean.

If I ssh into the box and do zpool list It shows as the total size being 21.8 TB which sounds like the size of all the drives together.

Code:

NAME           SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
datapool      21.8T  1.32T  20.4T         -     1%     6%  1.00x  ONLINE  /mnt
freenas-boot  14.5G   698M  13.8G         -      -     4%  1.00x  ONLINE  -

I've also attached a screenshot of the Volume Status page to show it's a Raidz2.

I'm not really sure why it shows "datapool" twice in the Storage Volumes screen. When I was doing the wizard I set the zpool name as "datapool" but I'm not sure why there's also dataset called "datapool".

I'm newer to this, but I think where I went wrong was with using the wizard possibly. Anything on this can be wiped, and I can copy data back to it later.

I apologize for the newb question, but before I put this into production I want to make sure I have all my ducks in a row.

Thanks!

 

[HoneyBadger]

If you do a zpool status does it show as a raidz2 there as well?

If I do zpool list on one of mine, for example, I get:

Code:

NAME           SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
freenas-boot  3.91G   947M  2.98G         -      -    23%  1.00x  ONLINE  -
honeybadger   5.44T  79.6G  5.36T         -     6%     1%  4.62x  ONLINE  /mnt

It's 12x 1TB in 6x2-way mirror, so the 5.44T is indicating the "correct capacity" of the vdevs.

What version of FreeNAS are you running?

 

[jbbender22]

Thanks for the reply. What you have there makes sense.

The version I'm running is FreeNAS-9.3-STABLE-201508250051

Here's the output from zpool status

Code:

  pool: datapool
state: ONLINE
  scan: scrub repaired 0 in 0h55m with 0 errors on Thu Aug 27 10:11:07 2015
config:

        NAME                                            STATE     READ WRITE CKS                                                                                                                                                             UM
        datapool                                        ONLINE       0     0                                                                                                                                                                  0
          raidz2-0                                      ONLINE       0     0                                                                                                                                                                  0
            gptid/6cd41802-4b64-11e5-9df0-0cc47a72093a  ONLINE       0     0                                                                                                                                                                  0
            gptid/6d36c5ba-4b64-11e5-9df0-0cc47a72093a  ONLINE       0     0                                                                                                                                                                  0
            gptid/6d9b16e8-4b64-11e5-9df0-0cc47a72093a  ONLINE       0     0                                                                                                                                                                  0
            gptid/6dfd781d-4b64-11e5-9df0-0cc47a72093a  ONLINE       0     0                                                                                                                                                                  0
            gptid/6e5e1456-4b64-11e5-9df0-0cc47a72093a  ONLINE       0     0                                                                                                                                                                  0
            gptid/6ebfda92-4b64-11e5-9df0-0cc47a72093a  ONLINE       0     0                                                                                                                                                                  0

errors: No known data errors

  pool: freenas-boot
state: ONLINE
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        freenas-boot  ONLINE       0     0     0
          da0p2     ONLINE       0     0     0

errors: No known data errors

 

[HoneyBadger]

Certainly looks like it's a raidz2 as intended.

I haven't brought this machine up to 9.3.1 (which is what you're running) so it's possible there's a bug in the GUI's size reporting, but it wouldn't explain the zpool command showing the wrong size.

If deleting the pool and recreating is a possibility, I'd give that a shot and see if it is still there afterwards. If it is, maybe a bug report is in order.

 

[Ericloewe]

I'm not really sure why it shows "datapool" twice in the Storage Volumes screen.

The top-level dataset is automatically created with the same name as the pool.

 

[jbbender22]

The top-level dataset is automatically created with the same name as the pool.

Thanks for the clarification on this! I wasn't 100% sure, but I kind of figured such.

 

[jbbender22]

I reinstalled FreeNAS and started over. I get the still get the same numbers in the Storage Volume screen. I'll look into filing a bug if there isn't one already.

I appreciate everyone's input on this!

 

[jbbender22]

I just wanted to follow up on this quick. I filed a bug and got a response. It's normal behavior. Anyone interested can read more about it here:

https://docs.oracle.com/cd/E26502_01/html/E29007/gbbti.html