Chapter 3. IBM System Storage DS4000 and DS5000 hardware 85
1 Gbps iSCSI host Ports
The iSCSI ports support both IPv4 and IPv6 TCP/IP addresses, CHAP, and iSNS. Use
either Cat5E or Cat6 Ethernet cable types for iSCSI port connections. A Cat6 Ethernet
cable provides optimal performance. The setup of the host ports will be done in the
Storage Manager. By default, the iSCSI ports autonegotiate between 100 and 1000 Mbps
Ethernet speed.
It is important to match up host or fabric connections to the DS5020 by attaching one
connection to each controller. In doing so, you take advantage of the DS5020’s ability to fail
over and distribute the workload among the two controllers. For any given host, make sure to
connect to the same host port number on each controller. The host port layout is shown in
Figure 3-68 on page 91.
Figure 3-62 DS5020 mixed host connection layout
3.5.7 DS5020 storage subsystem drive-side connections
The DS5020 can attach up to six expansion enclosures. The regular expansion enclosure is
the EXP520. However, you can buy a feature that enables you to attach EXP810 as well (refer
to “Disk drives” on page 67). Only these two expansion enclosures are currently supported. It
is generally best to spread the enclosures evenly between the two drive channel pairs as you
scale up the DS5020 in storage capacity. A fully configured DS5020 should have three
expansion enclosures on each drive-side channel pair.
Both drive ports on the DS5020 controller belong to the same drive channel, which means
that both drive ports must operate at the same Fibre Channel speed. However, there are only
4 Gbps expansion units supported.
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