IBM TotalStorage FAStT EXP700, Installation And User Manual

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Expansion unit speed settings
The default switch setting is 2 Gb per second. Be sure that you have read
“Storage-management software and hardware compatibility” on page 7 to determine
the correct operating speed
before you complete the following steps to access and
enable drive operation to 1 Gb per second:
1. Using a Phillips screwdriver, loosen the screw that secures the switch cover
plate to the expansion unit; then, remove the switch cover plate.
2. To enable 1 Gb per second drive operation, press on the left side of the switch
to 1 Gb/s (when set to 1 Gb/s, the green LED to the right of the switch is off).
3. Replace the switch cover plate.
4. Continue with “Cabling the expansion unit”.
Cabling the expansion unit
The FAStT EXP700 provides two redundant loops. A redundant FAStT EXP700 loop
consists of one or more expansion units connected to a storage server using two
sets of Fibre Channel cables. If one Fibre Channel loop fails, the storage server
uses the other FAStT EXP700 loop to maintain input/ouput to the FAStT EXP700
array group. Usually, there are two RAID controllers in a storage server. Use the
Fibre Channel Cabling Instructions that comes with your storage server for the
specific information about cabling the FAStT EXP700. Before cabling the expansion
unit, read the following information:
v
Fibre Channel loop: A Fibre Channel loop consists of Fibre Channel disk drives
connected to each other and to one or more RAID controllers. A loop can support
multiple RAID controllers, a large number of disk drives, and other addressable
entities such as system-management logic chips. Refer to your storage server
documentation for information about controller-dependent hardware configuration
details. Some controllers might have restrictions on the maximum number of disk
drives supported on a loop, cabling restrictions, and other requirements.
v
SFP module ports: Your FAStT EXP700 supports large, complex, and redundant
disk drive loop configurations. Each ESM has two SFP module ports. Each SFP
module has an input and output port. A loop is created by connecting one or
more FAStT EXP700 expansion units to one or more RAID controllers. You then
use dual fiber-optic cables to connect one FAStT EXP700 to another.
v
Fibre Channel cable restrictions: RAID controllers use specific IBM Fibre
Channel options. Refer to the Fibre Channel Cabling Instructions that come with
your storage server for the cable option that is required for your configuration.
v
Power cabling: The expansion unit uses two standard power cables. You can
connect the power cables to a primary power unit inside the rack cabinet, such
as a properly grounded ac distribution unit or uninterruptible power supply (UPS).
You can also connect the power cable to an external source, such as a properly
grounded electrical outlet.
Installing SFP modules
The FAStT EXP700 requires SFP modules. SFP modules are used to convert
electrical signals to optical signals that are required for Fibre Channel transmission
to and from RAID controllers. After you install the SFP modules, you will use
fiber-optic cables to connect the FAStT EXP700 to a FAStT200, FAStT500, or
FAStT700.
Before installing SFP modules and fiber-optic cables, read the following information:
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IBM TotalStorage FAStT EXP700 Storage Expansion Unit: Installation and User’s Guide