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Using EXP810 storage expansion enclosures
The section provides instructions on how to connect one group of four EXP810
storage expansion enclosures in a redundant drive loop. Instructions for how to
connect a second group of four EXP810 storage expansion enclosures in a
redundant drive loop are also included in this procedure. In addition, this procedure
is also applicable when you have any number of enclosures, up to the maximum
number that can be attached in the redundant drive loop pair.
To complete this procedure, you will need two fiber-optic cables per storage
expansion enclosure.
Attention: Handle and install fiber-optic cables properly to avoid degraded
performance or loss of communications with devices. Do not overtighten the cable
straps or bend the cables to a diameter of less than 76 mm (3 in.) or a radius less
than 38 mm (1.5 in.).
Connecting
EXP810 in a redundant pair of drive loop: This procedure
describes how to cable 16-drive EXP810 storage expansion enclosure together in a
redundant pair of drive loops.
1. Connect the first two storage expansion enclosures to drive loop A, as shown in
Figure 67.
Starting with the first storage expansion enclosure, connect a fiber-optic cable
from port 1B on the ESM A board to port 1A on the ESM A board in the second
(next) storage expansion enclosure.
For the location of the ports on the storage expansion enclosure ESM board,
see Figure 68 on page 91.
EXP810
ESM B
ESMA
EXP810
ESM B
ESMA
EXP810
ESM B
ESMA
EXP810
ESM B
ESMA
Port 1B
Port 1B
Port 1A
Port 1B
Port 1A
Port 1A
Port 1B
Port 1A
Port 1B
Port 1B
ds4500_8101
Loop A
First storage
expansion enclosure
Second storage
expansion enclosure
Third storage
expansion enclosure
Fourth storage
expansion enclosure
Port 1A
Port 1B
Port 1A
Port 1B
Figure 67. Connecting two EXP810 storage expansion enclosures into drive loop A
90 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide