SOLVED Size of ZPool

[tstorzuk]

Quick question,

I have 8 x 4Tb hard drives in a Zpool Z2. What should the available size of the Zpool be? It's showing as 13.6Tb. But I'm pretty sure it should be closer to 24Tb.

Can someone confirm if this number is correct, or if I should have a much larger available size?

 

[Ericloewe]

Quick question,

I have 8 x 4Tb hard drives in a Zpool Z2. What should the available size of the Zpool be? It's showing as 13.6Tb. But I'm pretty sure it should be closer to 24Tb.

Can someone confirm if this number is correct, or if I should have a much larger available size?
View attachment 7112

Yeah, 24TBish. Post the output of zpool status in code tags to preserve the formatting. Got any snapshots? If so, that explains what's going on.

 

[BigDave]

If your pool is RAIDz2, then this will be of help...
Biduleohm's Calculator

 

[tstorzuk]

Here's the Zpool status;

Code:

[root@morphius ~]# zpool status MORPHIUS_RAID-03                                                                                   
  pool: MORPHIUS_RAID-03                                                                                                           
state: ONLINE                                                                                                                     
  scan: none requested                                                                                                             
config:                                                                                                                            
                                                                                                                                   
        NAME                                            STATE     READ WRITE CKSUM                                                 
        MORPHIUS_RAID-03                                ONLINE       0     0     0                                                 
          raidz2-0                                      ONLINE       0     0     0                                                 
            gptid/df9f3471-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
            gptid/e002d361-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
            gptid/e0666961-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
            gptid/e0c8459b-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
          raidz2-1                                      ONLINE       0     0     0                                                 
            gptid/e131ea0c-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
            gptid/e19a5811-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
            gptid/e1fec8d0-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
            gptid/e267f61d-cfd2-11e4-bbce-002590d41b29  ONLINE       0     0     0                                                 
                                                                                                                                   
errors: No known data errors

 

[tstorzuk]

If your pool is RAIDz2, then this will be of help...
Biduleohm's Calculator

Yeah, it's a bit lower than 24Tb, but bigger than 13. That calculator says that it should be 17.18Tb.

 

[Jailer]

It's smaller because you have 2 RAIDZ2 vdevs consisting of 4 drives each. Half of your drives are being used for parity.

If more space is what you desired you should have created a single pool with all 8 drives.

Should have read the manual. ;)

 

[Ericloewe]

It's smaller because you have 2 RAIDZ2 pools consisting of 4 drives each. Half of your drives are being used for parity.

If more space is what you desired you should have created a single pool with all 8 drives.

Should have read the manual. ;)

Not two pools, two vdevs.

In any case, OP has four "data" and four "parity" drives, so you end up with 16TBish, which sounds like the number posted.

 

[Jailer]

Not two pools, two vdevs.

In any case, OP has four "data" and four "parity" drives, so you end up with 16TBish, which sounds like the number posted.

Correct, not sure why I posted pools instead of vdevs. Post corrected.

 

[Tywin]

Yeah, it's a bit lower than 24Tb, but bigger than 13. That calculator says that it should be 17.18Tb.

Careful, that 17.18 TiB (use the proper units, please) is accounting for the recommended free space. The number FreeNAS will show you is the total available space, so in that calculator you should be comparing against the "Total data space" line entry.

As the others have pointed out, you don't have one 8-drive RAIDZ2, you have two 4-drive RAIDZ2s.