Figure
21.
Storage
expansion
enclosure
seven-segment
enclosure
ID
Fibre
channel
loop
and
ID
settings
When you install a hard disk drive in the storage expansion enclosure, the drive
tray plugs into a printed circuit board called the
midplane
. The midplane sets the
fibre-channel loop ID automatically based on the enclosure ID setting and the
physical location (bay) of the hard disk drive.
Cabling
the
EXP810
The storage expansion enclosure supports two redundant drive loops. A redundant
storage expansion enclosure drive loop consists of one or more storage expansion
enclosures that are connected to a storage subsystem using two sets of
fibre-channel cables. If one fibre-channel drive loop fails, the storage subsystem
uses the other drive loop to maintain input/output (I/O) to the storage expansion
enclosure drives. Usually, there are two redundant array of independent disks
(RAID) controllers in a storage subsystem. Use the
Installation,
User's
and
Maintenance
Guide
or
System
Storage
Quick
Start
Guide
that ships with your
storage subsystem for the specific information about cabling the storage expansion
enclosure to a storage subsystem. Before cabling the storage expansion enclosure,
read the following information:
v
Fibre-channel
loop/channel:
A fibre-channel loop (or fibre channel drive channel
as it is called in certain DS4800 and DS4700 Express storage subsystem
documentation) consists of drive expansion enclosures that are connected to
each other and to one or more RAID controllers. A loop/drive channel can
support multiple RAID controllers, multiple drive expansion enclosures, and other
addressable entities such as system-management logic chips. Refer to your
storage subsystem documentation for information about controller-dependent
hardware configuration. Some controllers might have restrictions on the
maximum number of disk drives that can be supported on a loop, cabling
restrictions, and other requirements.
v
SFP
module
ports:
The storage expansion enclosure 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 storage expansion enclosures to one or more RAID
controllers.
v
Fibre-channel
cable
restrictions:
RAID controllers use specific IBM
fibre-channel options. Refer to the
IBM
System
Storage
DS4000
Hardware
Maintenance
Manual,
Problem
Determination
Guide,
or your IBM representatives
or resellers for the cable option that is required for your configuration.
42
IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide
Summary of Contents for DS4000 EXP810
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