iSCSI Servers
The iSCSI protocol allows disks, logical volumes and files to be exported from a server system (also known as a target) as block devices to clients (known as initiators). Most Linux systems have the software included in their package database required to act as an iSCSI client or server, although it may not be installed by default.

This page allows you to designate systems as iSCSI servers, so that they can export either LVM logical volumes or regular files to host systems for use as virtual system disk images. This has the advantage of allowing virtual systems to be moved between hosts without the need to copy disk images around. It also lets you centralize storage on a single server, rather than requiring each host to have its own large disks or volume group.