IBM totalstorage fastt100, Installation, User And Maintenance Manual, Page: 63 / 160

shows the direct management method.
Ethernet
Host computer
Controller
Controller
Controller
Controller
Fibre Channel
I/O path
Management station
Note: The client software is
installed on one or more
management systems,
or on the host computer.
Storage subsystems
f10ug008
Fibre channel connections
The storage server fibre channel consists of a host fibre channel loop and a drive
fibre channel loop. The host fibre channel loop provides the fibre path for host
attachment. It can consist of fibre channel cables, SFPs, host bus adapters, fibre
channel switches, and RAID controllers. The drive fibre channel loop provides the
fibre path to the hard disk drives (HDDs). The drive fibre channel loop consists of
fibre channel HDDs and optional drive expansion units, fibre channel cables, and
SFPs.
The FAStT100 supports redundant disk-drive-loop configurations. Each RAID
controller has three SFP ports. These SFP ports are labeled Host 1 , Host 2 , and
Expansion . You can build a redundant drive loop by connecting one or more
expansion units to the redundant RAID controllers. Then, use dual fiber-optic cables
to connect one expansion unit to another in a daisy-chain. For more information
about adding expansion units, see “Connecting expansion units” on page 53.
Fibre channel loop configurations
You must determine how the host systems will connect to the storage server. You
can connect up to two host systems directly to the storage server, or you can
connect more than two hosts to the fibre channel storage server through switches.
The illustrations in the following sections show common host system configurations.
Figure 23. Direct-managed storage subsystems
Chapter 2. Installing the storage server
33