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Case for iSER
RDMA over TCP/IP technology satisfies the data movement needs of iSCSI.
Zero-copy, direct data placement can be achieved with generic protocols.
Opportunity for iSCSI protocol to offload some complexity
iWARP suite offers CRC-level reliability on TCP/IP.
Need a “glue protocol” to run iSCSI most efficiently on the (presumed to become) pervasive RNICs.

iSER has the explicit design goal to let iSCSI run on RNICs requiring no greater number of interrupts than an iSCSI NIC does – i.e. run most efficiently on generic RNICs.
PPT Version