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zfs - zpool import: volume FAULTED with corrupted data, is it possible to save some data?

I was using Freenas 8.2 and decided to upgrade to 9.2. All seem to go well, upgraded zfs to 28 and rebooted. During next boot it seem to take forever and at some point I decided to turn off the machine. I guess this is what caused the problem.




When I try to import I get the following:




[root@freenas] ~# zpool import   
pool: vol4disks8tb
     id: 12210439070254239230
  state: FAULTED
 status: The pool was last accessed by another system.
 action: The pool cannot be imported due to damaged devices or data.

        The pool may be active on another system, but can be imported using
        the '-f' flag.
   see: http://illumos.org/msg/ZFS-8000-EY
 config:

        vol4disks8tb                                    FAULTED  corrupted data
          raidz2-0                                      ONLINE
            gptid/3d316d16-f53e-11e1-9da5-080027dfca8a  ONLINE
            gptid/3df02143-f53e-11e1-9da5-080027dfca8a  ONLINE
            gptid/3eb99e55-f53e-11e1-9da5-080027dfca8a  ONLINE

            gptid/3f91c723-f53e-11e1-9da5-080027dfca8a  ONLINE
[root@freenas] ~#


EDIT: The commands "zpool import -f", "zpool import -f -F -n" and "zpool import -f -F" return the exact same output as the previous command.



EDIT #2: the command "zpool import -f 12210439070254239230" returned




cannot import 'vol4disks8tb': I/O error

     Destroy and re-create the pool from
     a backup source.


I have so far tried the suggestions found in this answer and the "auto import volume" found in the web interface of freenas which writes this errors in /var/log/messages:




Jul  8 14:46:06 freenas manage.py: [middleware.notifier:3291] Importing vol4disks8tb [12210439070254239230] failed with: cannot import 'vol4disks8tb': I/O error
Jul  8 14:46:06 freenas manage.py: [middleware.exceptions:38] [MiddlewareError: The volume "vol4disks8tb" failed to import, for futher details check pool status]



Running "zpool status" returns "no pools available".



I don't care about most of the data on those disks, however I have close to 15 years of photos on those disks, is there any way to retrieve them? Please help!

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