Opening up ZFS pool as writable

Question

I have installed FreeBSD onto a raw image file using QEMU Emulator successfully. I have formatted the image file using the ZFS file system (ZFS POOL).

Using the following commands below I have successfully mounted the image file ready to be opened by zpool

sudo losetup /dev/loop0 [path-to-file].img
sudo kpartx -l /dev/loop0
sudo kpartx -av /dev/loop0

However with the next command show below....

sudo zpool import -R [MOUNT-PATH] -d /dev/mapper

I get the following error message

The pool can only be accessed in read-only mode on this system. It
    cannot be accessed in read-write mode because it uses the following
    feature(s) not supported on this system:
    com.delphix:spacemap_v2 (Space maps representing large segments are more efficient.)
The pool cannot be imported in read-write mode. Import the pool with
    "-o readonly=on", access the pool on a system that supports the
    required feature(s), or recreate the pool from backup.

I cannot find anywhere online about the feature called 'spacemap_v2'. How do I install this or how do I mount my zfs pool to be writable. I know I can mount it as read-only but that defeats the purpose of what I want to do as I want to be able to write data to copy/paste data in its mountable platform interface.

Does anyone know how to achieve this. I shall be grateful for a response.

Regards

Answer 1

What version of FreeBSD are you using? And where did this ZFS pool come from?

I'm guessing it's a ZFS On Linux pool which, as the message says, is using a feature which FreeBSD's ZFS doesn't currently support.

The only way around it at the moment is to create another pool without the feature on a system that does support it, zfs send to the new pool and then import that pool into FreeBSD.

Note FreeBSD is going to support this feature Soon(tm).