I wrote one a while back for OpenSUSE (link), which you may have already run into during your googling. Since that's for an RPM-based distribution all the steps aren't 100% accurate.
What you want to do is entirely possible on Ubuntu. The first step is to get a local Kernel source-archive locally. That's extensively documented here. The key step is
sudo apt-get build-dep --no-install-recommends linux-image-$(uname -r)
apt-get source linux-image$(uname -r)
Which will get it locally. Read the whole thing for more on the details of compiling stuff for kernels.
From there, you need to pick up the LIO archive from the backports channel (see my link).
git clone git://linux-iscsi.org/lio-core-backports.git lio-core-backports.git
git clone git://git.kernel.org/pub/scm/linux/storage/lio/lio-utils lio-utils.git
Next step: prepare the kernel. Change-directory into the kernel source (most likely /usr/src/linux) and run the following pair of commands:
make oldconfig
make prepare
This will prep the kernel for compiling modules for your current kernel rev.
Next, change into the lio-core-backports.git directory you created above and run:
./autoconfig
make
make install
Errors here are likely to due to the kernel archive not being prepped correctly. The last step here actually installs the modules. Now to install the utilities that make managing this easier.
Change into the lio-utils.git directory and repeat the above commands.
You now have (probably) LIO-Target installed. Time to get your config file worked up. Once you've gotten to the point of figuring out how to get the config files tweaked just right, you already have the kernel modules installed and ready to roll.
Disclaimer: I am minimally familiar with how Ubuntu's package manager works, so the above apt-get stuff was pulled directly from documentation. Your actual commands may vary. Batteries not included.
While googling about connection problems I notices this Article
When you create an iSCSI Target with the Microsoft iSCSI Target
software, you create devices and assign them to an iSCSI Target.
The problem is that you need to tell the target which clients are
allowed to connect—which by default is no one. Select the properties
of the iSCSI target and, under the iSCSI Initiators tab, click Add and
select the IQNs of the clients who are allowed to connect. The IQNs of
clients that have tried to connect in the past will be displayed, or
you can manually type the IQN of the allowed clients. The clients
should now be able to connect.
If you're unsure of the IQN of an iSCSI Initiator (the client), launch
the iSCSI Initiator Administrator Tool application on the client.
Under the Configuration tab, its IQN is shown.
And it explained that the iSCSI initiators tab on the Target should be correct. So I checked my IQN again and yep I fat fingered it! After entering the correct address connection was a fact!
Best Answer
Basically there are 4 commands that need to be implemented in target for VAAI support, namely:
On the LIO side you need to set emulate_3pc(Xcopy),emulate_tpu(UNMAP) and emulate_caw(ATS), so you will get VAAI supported status for the LIO target on the esxi side.
Refer linux-iscsi.org/wiki/Targetcli for details.