Redundant drive channel pair
Each storage controller on the DCS3700 storage system has a drive expansion channel that contains an x4
SAS port. The storage expansion enclosures that are connected to this connector form a drive channel.
The maximum number of drives that can be installed in one drive channel is 180. In a dual-controller
DCS3700, one drive channel from each controller combines to form a redundant drive-channel pair. If any
component of the drive channel fails, the controllers can still access the storage enclosures in the
redundant drive-channel pair.
Connecting secondary interface cables
This section applies to direct (out-of-band) management configurations only. If your configuration uses
host-agent (in-band) management, skip this section. Use the Ethernet management port on the rear of the
DCS3700 system storage controllers for direct management of the storage subsystems (see Figure 37 on
page 57).
Important::
1. To minimize security risks, do not connect the DCS3700 to a public LAN or public
subnet. Use a local private network for the DCS3700 and the storage management station
Ethernet connectors.
2. For proper EMI shielding, always use quality braided and if necessary, shielded cables.
Connect an Ethernet cable from the management station to the Ethernet connector on controller A and
controller B on the rear of the DCS3700 storage system.
Configuring the storage subsystem
After you install the DCS3700 storage system and DCS3700 expansion enclosures in a rack, it is necessary
to configure the storage subsystem. Use the information in the following sections to configure your
storage subsystem.
Storage subsystem management methods
Before you configure the storage subsystem, determine which method of storage subsystem management
you want to use. You can manage the storage subsystems in either of two ways: host-agent (in-band)
management or direct (out-of-band) management.
Note: For information about any in-band limitations or restrictions that are associated with particular
combinations of controller and host bus adapter, see the Storage Manager readme file.
For more information about setting up in-band or out-of-band management connections, see the DS
Storage Manager 10 Installation and Host Support Guide for the operating system of the host server that you
will use to manage the DCS3700 storage subsystem. The document is in the Documentation folder on the
IBM Storage Manager v10.xx DVD.
Important:: If the operating system of the host server that the storage subsystem logical drives are
mapped to is not Microsoft Windows Server 2003 or Windows Server 2008, you must make a
direct (out-of-band) management connection to the storage subsystem to set the correct host
type first. Then, the server will be able to recognize the storage subsystem correctly for
host-agent (in-band) management.
Host-agent (in-band) management method: This method requires that host-agent software be installed
on the host server. The host-agent software enables the Storage Manager software client program to
manage the storage subsystem by using the same connections between the host server and the storage
subsystem. You must install at least one management station and a software agent host. The management
station can be the host or a workstation on the Ethernet network. The client software is installed on the
management station. The following illustration shows the host-agent (in-band) management method.
Chapter 3. Cabling the DCS3700 55
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