Rate my Vdev/ZPool?

[RichTJ99]

Hi,

I am working on backing up my main freenas box (details in sig).

I have a Vdev which has 8x 6TB disks (setup using the 1meg recommendation) into a RaidZ2. I have a single Zpool called "Pool".

My understanding is that I can have two drives fail at the same time & still have my data intact.

Pool size is 29.3TiB - I am a little confused as I thought Z2 would be 6x6 Tib or closer to 36Tib vs the 29Tib I have now. Do I have 3 actual disks for "parity"?

I am working on separate backup options for this setup (maybe two others).

Is my box sufficiently protected (generally speaking) for drive failure?

Thanks,
Rich

 

[depasseg]

What is the output of zpool status?

And don't forget that 6TiB is roughly 10% smaller than 6TB.

 

[RichTJ99]

Code:

  pool: Pool
state: ONLINE
  scan: resilvered 291M in 0h0m with 0 errors on Fri Apr  8 14:57:18 2016
config:

        NAME                                            STATE     READ WRITE CKS                                                                                                                                                             UM
        Pool                                            ONLINE       0     0                                                                                                                                                                  0
          raidz2-0                                      ONLINE       0     0                                                                                                                                                                  0
            gptid/0b529c5d-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/0c06e66e-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/0cbe3ea7-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/0d748ff3-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/0e2a178b-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/0ed53739-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/0f90a6e1-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0
            gptid/1052d369-c7c7-11e5-af5e-0cc47a6be4a4  ONLINE       0     0                                                                                                                                                                  0

errors: No known data errors

[\code]

 

[Bidule0hm]

Actually you have exactly 30 TiB usable (10.1 + 19.9) which sounds right as you have 32.7 TiB raw, minus the overheads and you get the 30 TiB you have ;)

 

[RichTJ99]

So this all looks like the right amount of storage space & looks to be a decent design (not reckless)?

 

[Bidule0hm]

Yep, I don't see any problem ;)

Just to be sure you know it: if you care about your data then backup it, RAID doesn't replace backups :)