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Chapter 4
Subsystem Connection and Operation
4.1 Connection Overview
4.1.1 Cabling
Following are the requirements on the type of cables used to connect the subsystem’s
iSCSI host ports:
1. Gigabit Ethernet network cables.
2. Cat5e STP type cables or better performance types (important for meeting the
requirements imposed by emission standards).
3. Straight-through Ethernet cables with RJ-45 plugs.
4. Use of cross-over cables can also automatically be detected and re-routed for a
valid connection.
Connection:
1. Directly to iSCSI initiators or through Gigabit Ethernet switches.
2. To servers equipped with an iSCSI HBA, and then to client stations with an
Ethernet NIC or iSCSI HBA.
3. The subsystem presents its logical capacity volumes through SCSI-like IDs and
LUN’s. These RAID volumes then appear as iSCSI targets through the
network.
NOTE:
Even though iSCSI initiator software is a cost-effective way of building iSCSI SAN,
software initiator adds additional workload to the server processor. It is recommended
to apply iSCSI HBAs that come with TCP/IP offload engines in order to reduce
overhead.
4-1