after building my Amahi server i used the very helpful page 'Adding a second hard drive to your HDA' on the WIKI pages. There were however a few things that I found a bit confusing:
In a lot of BIOS'ses certain hard drives are not listed. SATA drives using AHCI, drives connected to an (on board) add-on card and there are probably more. In my Ahahi server (and my desktop) there are NO hard drives listed in the BIOS, only a DVD drive. Small point, I know.Make sure your drive is detected by the BIOS
It should be listed in the drives that appear when you boot your computer, before the Fedora boot screen appears. You can also enter you BIOS and confirm they appear there.
I installed Amahi using the Express CD, so there is no desktop after install, that also means that GParted won't run. I'm not sure if there is a way to make it run in in a terminal, but I couldn't find it. So i tried Parted, Fdisk, CFdisk but i could not get any of them to make EXT3 partitions. I googled for a solution, and hey, it's Linux so there were a LOT, dating back to 1995 (or so)..... I'm not a complete Linux noob (almost) and it was a bit confusing but it worked in the end.From the HDA desktop (or using VNC), Open Terminal as root and type gparted to launch the GParted application.
I did and when I ran 'HDA-diskmount' I got:You'll probably want to create a single partition, and format it as ext3.
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx /var/hda/files/drives/sdb1 ext4 defaults 1 2
So, EXT4, just as in the WIKI. Does that mean anything? Is it important?
I had to read that a couple of times before I understood, that what was probably meant here, that if you install Windows on the same server as Amahi (dual boot) you'll run into trouble. Are people really doing that? My first thought was that I couldn't access the disks with a Windows client....Note that Windows can't read ext3 partitions, so if you want to read your disk on Windows, you should format as NTFS instea, and you should do that on Windows before you connect the drive in your HDA.
This line added to the confusing cause the link doesn't go anywhere (?). Well, maybe it's just me.Be sure to read the last section about NTFS on this page if you use a NTFS partition!

After getting to this point I added my drives to the Greyhole storage pool and all is working perfectly! Really like Amahi/Greyhole so far.
Like Guillaume wrote somewhere on this forum: " There are good reasons why we have our own wiki page on how to add secondary hard drive, and we don't just forward you to the hundreds of already existing pages that do something similar."
I totally agree! If your not a Linux expert (I'm not), the multizillion internet pages telling you how to do something in Linux (that just won't work exactly that way in your situation) are confusing and time consuming. So, if I'm not the only one, updating the WIKI page would be great!
Richard