Okay fixed the fusion drivers for ESXi 6.0u1.
What you do is:
- Install ESXi 6.0u1 (I've used VMware-VMvisor-Installer-6.0.0.update01-3073146.x86_64.iso) as you always do (using console or ILO0;
- Install FusionIO driver (I've used 3.2.8) scsi-iomemory-vsl-5X-3.2.8.1350-offline_bundle-1816341.zip & libvsl-1.0.0-500-offline-bundle.3.2.8.1350.zip; (see below for more details)
- Install the latest patch for ESXi 6.0 (I've used ESXi600-201511001.zip). (see below for more details)
FusionIO driver installation:
I've got an couple of HP FusionIO (Generation 2 HP IO Accelerators) cards (673648-b21) http://h20564.www2.hpe.com/hpsc/swd/public/detail?swItemId=MTX_04b41eb7083647c788f9d3392e&swEnvOid=4166
Get the drivers to a local datastore.
Go to the host using SSH and use esxcli to install the drivers:
esxcli software vib install -d /vmfs/volumes/abc/scsi-iomemory-vsl-5X-3.2.8.1350-offline_bundle-1816341.zip -f (change the path to your own datastore)
esxcli software vib install -d /vmfs/volumes/abc/libvsl-1.0.0-500-offline-bundle.3.2.8.1350.zip -f (change the path to your own datastore)
You have to use the -f option to force the installer to install these packages (these packages are made for ESXi 5.x)!!!!!
Reboot the machine!
Connect to the host again using SSH and install the patch:
esxcli software vib update -d /vmfs/volumes/abc/ESXi600-201511001.zip -f (change the path to your own datastore)
You have to use the -f option to force the installer to install this package (this packages will override some files)!!!!!
Reboot the machine again!
Once you've done this, the ESXi 5.x drivers are functioning under ESXi 6.0 without any problems. I use the FusionIO drives as VSAN-cache (also as storage for this test)
The drives show up in ESXi like this:

In the VSAN:

So you can use your FusionIO drives in 6.0!
An update of 5.5 to 6.0 with FusionIO drives is also possible. Just use VUM to update your hosts (worked for some of our machines, but I prefer a fresh install).
For more information use this pdf from ioMemory: ioMemory_VSL_3.2.6_User_Guide_for_VMware_ESX_and_ESXi_2013-10-07.pdf (all the commands and some background info is there. It is an older document, version 3.2.6, but the commands haven't changed).
Optionally you want to update the firmware of the FusionIO. I've used ioaccelerator_3.2.8-20140508.fff since it is compatible with the drivers (see the pdf from ioMemory how to update the firmware).
The host is compatible and 100% compliant with VUM (original base and patches, checked on January 7th 2016)
