IBM Midrange System DS4000 Series Hardware Manual page 165

Direct (out-of-band) management method
When the direct (out-of-band) management method is used, storage systems are managed
directly over the network through a TCP/IP Ethernet connection to each controller. To manage
the storage system through the Ethernet connections, the IP address and host name for each
controller must be defined or the DS5000 storage subsystem must be set to use
DHCP/BOOTP settings. The controllers must be attached to a Local Area Network (LAN)
through Ethernet, as shown in Figure 4-14.
Figure 4-14 Out-of-band management
Managing storage systems using the direct (out-of-band) management method has the
following advantages:
The Ethernet connections to the controllers enable a management station running
SMclient to manage storage systems that are connected to a host running any of the
operating systems that are supported by the current level of Storage Manager.
An access logical drive is not needed to communicate with the controllers. The maximum
number of logical drives that are supported by the host operating system can be
configured and used.
The storage system can be managed when there are problems with the Fibre Channel
links.
Security is enhanced when management LANs/VLANs and more advanced solutions,
such as VPN, can be used to manage the system remotely.
More DS5000 storage subsystems in the network can be managed through one Storage
Manager interface.
Managing storage systems using the direct (out-of-band) management method has the
following disadvantages:
Two Ethernet cables are required to connect the storage system controllers to a network.
When adding devices, the IP address or host name for each controller must be provided.
DHCP/BOOTP server and network preparation tasks are required. This can be avoided by
assigning static IP addresses to the controller, or by using the default IP address.
PC workstation
with SMclient
LAN
DS5000 Storage Controller
Chapter 4. IBM System Storage DS planning and configuration
147