RHEV Storage Tuning
If you want to explore RHEV , but if you don't have Fibre Based Storage , then still you can configure NFS or ISCSI using tgtd on your RHEL Box to act as an storage .
Making NFS on your Desktop or laptop Faster
Suppress access time updating (atime) on the file system backing up the NFS server - in fact I'd always disable atime on a desktop or laptop that will serving a storage disk to RHEV.
You can typically change the defaults like in /etc/fstab to defaults,noatime
Run your nfs server set to async.
Note : NEVER do this for production, it's a recipe for disaster but makes NFS demos on laptops or desktops much faster.
With this setting the NFS server will asynchronously write the data to disk - which means if you lose the power then you've lost data - so keep those batteries charged.
if you are adventurous, and use qcow2 over NFS, enable writeback for the cache - that will give you 30-40% real life boost
RHEV using iSCSI
For those who want to demo/test RHEV using iSCSI you can setup RHEL5 or Fedora as an iSCSI target.
This will work out of the box with RHEL5 and Fedora 10+ . You can check my below docs to set up iscsi target in detail .