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Configuring the drive loops
The procedure and illustrations in this section show an example of cabling a group of drive
enclosures into a redundant drive loop. For an example of a drive loop that has only one
drive enclosure, skip this procedure and go to
unit" on page
Attention: To complete this procedure, you will need two Fibre Channel interface cables.
Handle and install fiber-optic cables properly to avoid degraded performance
or loss of communications with devices. When working with fiber-optic
cables, do not pinch them, step on them, or locate them in aisles or walkways.
Do not overtighten the cable straps or bend the cables to a radius smaller than
76 mm (3 in.).
1 Connect the first two drive enclosures to drive Loop A, as shown in
Starting with the first drive enclosure, connect an interface cable from the In port on
the left environmental services monitor (ESM) board to the Out port on the left ESM
board in the second (next) drive enclosure.
2 Connect the same first two drive enclosures to drive Loop B, as shown in
Starting with the first drive enclosure, connect an interface cable from the In port on
the right ESM board to the Out port on the right ESM board in the second (next) drive
enclosure. If you want to cable more drive enclosures into Loops A and B, continue
with
Step 3 on page
unit" on page
Step 1: Cable the first two drive
enclosures to Loop A.
Last drive
enclosure
ESM boards
Loop A
interface cable
First drive
enclosure
Controller
In
Figure 19. Example of connecting two drive enclosures into a redundant drive loop
33.
32; otherwise, go to
33.
Out
ESM board
"Connecting drive cables to the controller
"Connecting drive cables to the controller
Step 2: Cable the first two drive
enclosures to Loop B.
In
ESM board
Chapter 2. Connecting the controller unit to the loop
Figure
19.
Figure
19.
Loop B
interface cable
Out
31
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