iSCSI is an IETF standard (RFC 3720) for remote access to block-level
storage. It can be thought of as similar to NFS, except that an NFS
server exports files; the iSCSI target exports blocks to the iSCSI
initiators, which are the clients.
To set up the target, you need to edit the /etc/iscsi/targets file.
It has a certain layout, to provide a means of (a) mirroring and (b)
combining multiple areas to present one large contiguous area of
storage. This can be multiply-layered.
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