Your zfs was working properly but you have upgraded your system, including the kernel, and your zfs is no more available.
This is normal because zfs was compiled for the other one.
So all you will have to do is to execute the following commands (do not forget of course to install/put in place the needed linux source or headers before that):
dpkg-reconfigure spl-dkms
dpkg-reconfigure zfs-dkms

I got this message today while trying to run sa-update command:

Most common place to get this error is when you try to compile something in cygwin environment because the configuration script is not able to detect properly the system type due to missing important information in config.guess. Therefore, in order to make it work, you need to replace the file with the one available in your system, providing you have installed already automake package.

TCP offload engine or TOE is a technology used in network interface cards (NIC) to offload processing of the entire TCP/IP stack to the network controller. It is primarily used with high-speed network interfaces, such as gigabit Ethernet and 10 Gigabit Ethernet, where processing overhead of the network stack becomes significant.

In below example, we are attaching an ISCSI disk to VM via VirtalBox.
Of course, you can also attach it directly from the VM if the OS supports it but this is not covered here.

How to find out the original MAC address from a network adapter with manually modified MAC address:

root@core:~# ethtool -P eth3
Permanent address: 10:a2:bc:86:22:16

How to disable ipv6 for a specific network adapter:

root@core:~# echo 1 > /proc/sys/net/ipv6/conf/iscsi/disable_ipv6

How to manually change the network adapter MAC address:

root@core:~# ifconfig eth3 | grep HWaddr
eth3      Link encap:Ethernet  HWaddr c3:de:c3:65:g3:4t

For this you will have to download the needed packages from IBM website. They are not free to download and you need user/pass and license. I will not cover this part at all.
Assuming you have already the needed packages, read what follows:

Version 1 - Replace in modules/gd/classes/GdToolkit.class:

case 'thumbnail':
        case 'scale':
            /* $parameters[0]: target width, [1]: optional target height */
            $targetHeight = empty($parameters[1]) ? $parameters[0] : $parameters[1];
            /* Don't enlarge images for a thumbnail */
            if ($operationName == 'thumbnail'
                    && $width <= $parameters[0] && $height <= $targetHeight) {
                break;

Version 1 - Replace in modules/imagemagick/classes/ImageMagickToolkit.class:

/* Don't enlarge images for a thumbnail */
 	    if ($width > $parameters[0] || $height > $parameters[0]) {
 		$this->_addResizeParam($transform, $parameters[0]);
 		list ($width, $height) =
 		    GalleryUtilities::scaleDimensionsToFit($width, $height, $parameters[0]);
 	    }

with:

/* Create the thumbnail with fixed width */
	    $aspect = $height / $width;
	    $targetWidth = $parameters[0];

If you attach to linux box a disk partitioned under FreeBSD or OS X, you will find this warning message on fdisk command:
"WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted."