IBM DS4800 User Manual

Table 24. Description of Figure 55 (continued)
Number Description
10 EXP810 enclosure 6
11 EXP810 enclosure 7
12 EXP710 enclosure 1
13 EXP710 enclosure 2
14 EXP710 enclosure 3
15 EXP710 enclosure 4
16 EXP710 enclosure 5
17 EXP710 enclosure 6
18 EXP710 enclosure 7
19 EXP710 enclosure 8
1. Make all connections from the left ESMs to the right ESMs in the expansion
enclosures, as indicated by 21, 23, 22, and 24.
2. To create drive channel 1, after connecting enclosures 1, 2, 3, and 4 together
(21), connect drive port 4 of controller A (4A) to EXP810 enclosures 1 (5),
2 (6), 3 (7), and 4 (8); then, connect drive port 1 of controller B (1B) to
enclosures 4 (8), 3 (7), 2 (6), and 1 (5).
3. To create drive channel 3, after connecting enclosures 5, 6, and 7 together
(23), connect drive port 3 of controller A (3A) to EXP810 enclosures 5 (9),
6 (10), and 7 (11); then, connect port 2 of controller B (2B) to enclosures
7 (11), 6 (10), and 5 (9).
4. To create drive channel 2, after connecting EXP710 enclosures 8, 9, 10, and 11
together (22), connect drive port 2 of controller A (2A) to enclosures 8
(12), 9 (13), 10 (14), and 11 (15); then, connect drive port 3 of controller
B (3B) to enclosures 11 (15), 10 (14), 9 (13), and 8 (12).
5. To create drive channel 4, after connecting EXP710 enclosures 12 (16), 13
(17), 14 (18), and 15 (19) together (24), connect drive port 1 of
controller A (1A) to enclosures 12 (16), 13 (17), 14 (18), and 15 (19);
then, connect drive port 4 of controller B (4B) to enclosures 15 (19), 14
(18), 13 (17), and 12 (16).
One DS4800 to two or more storage expansion enclosures in a
mixed environment
When intermixing EXP100s, EXP710s, and EXP810s in a DS4800 storage
subsystem configuration, if it is not possible to cable each group of enclosures by
model type (EXP100s, EXP710s, and EXP810s) in a separate redundant drive loop
pair or behind each port of the dual-ported redundant drive channel pair, group
them so that EXP810s are between EXP100s and EXP710s.
In addition, when an EXP100 is the first storage expansion enclosure cabled
directly to the storage subsystem's controller drive port, follow these rules:
v Cable from the storage subsystem controller drive port to the OUT port on the
left ESM (ESM A) of the EXP100.
Note:
This is a change from previous cabling recommendations where you
cabled from the controller drive port to the IN port on the left ESM (ESM
A) of the EXP100.
v If an EXP100 follows the initial EXP100, cable from the IN port on the left ESM
(ESM A) of the first EXP100 to the OUT port on the left ESM of the next
Chapter 3. Cabling the storage subsystem 81
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IBM DS4800 Specifications

General

Brand	IBM
Model	DS4800
Category	Storage
Language	English