I installed OpenFiler on an extra machine the other day. What's OpenFiler? According to the OpenFiler website:
Openfiler is a Storage Management Operating System. It is powered by the Linux 2.6 kernel and Open Source applications such as Apache, Samba, LVM2, ext3, Linux NFS and iSCSI Enterprise Target. Openfiler combines these ubiquitous technologies into a small, easy to manage solution fronted by a powerful web-based management interface. Openfiler allows you to build a Network Attached Storage (NAS) and/or Storage Area Network (SAN) appliance, using industry-standard hardware, in less than 10 minutes of installation time.
I've never worked with iSCSI before... but now I want to. The reason I'm looking into it is because RHEL 5 and others can use iSCSI disks to install to... and hopefully it'll work well for XenVMs too. Care to follow me on this, the initial leg, of my journey?