One DS4700 Express and three or more EXP810 storage expansion enclosures

In document Installation, User s and Maintenance Guide (Page 122-129)

To connect three or more storage expansion enclosures to a DS4700 Express Storage Subsystem, alternately connect a storage expansion enclosure to one of the drive ports of the dual-ported drive channel then connect to the other port until all of the storage expansion enclosures are attached. Figure 73 on page 91 shows the cabling scheme for one DS4700 Express Storage Subsystem and three EXP810 storage expansion enclosures behind both ports of a dual-ported drive channel.

ds470038 1

1

1

1

2 3

Figure 72. One DS4700 Express and two EXP810 storage expansion enclosures behind a pair of DS4700 drive ports

Perform the following steps to create the recommended cabling scheme shown in Figure 73:

1. Connect port 1A on the left ESM in the first EXP810 (2) to port 1B (1) on the left ESM in the third EXP810 (4).

2. Connect port 1A on the right ESM in the third EXP810 (4) to port 1B (1) on the right ESM in the first EXP810 (2).

3. Connect port 1B (1) on the left ESM in the first EXP810 (2) to port 2 of drive channel 1 on the DS4700 Express.

4. Connect port 1 of drive channel 2 on the DS4700 Express to port 1B (1) on the right ESM in the third EXP810 (4).

5. Connect port 1B (1) on the left ESM in the second EXP810 (3) to port 1 of drive channel 1 on the DS4700 Express.

6. Connect port 1B (1) on the right ESM in the second EXP810 (3) to port 2 of drive channel 2 on the DS4700 Express.

Figure 74 on page 92 shows the recommended cabling scheme for one DS4700 Express Storage Subsystem and four EXP810 storage expansion enclosures behind both ports of a dual-ported drive channel.

ds470055 1

1

1

1

2 3

1

1 4

Figure 73. One DS4700 Express and three EXP810 storage expansion enclosures behind a pair of DS4700 drive ports

Perform the following steps to create the recommended cabling scheme shown in Figure 74:

1. Connect port 1A on the left ESM in the first EXP810 (2) to port 1B (1) on the left ESM in the third EXP810 (4).

2. Connect port 1A on the right ESM in the third EXP810 (4) to port 1B (1) on the right ESM in the first EXP810 (2).

3. Connect port 1B (1) on the left ESM in the first EXP810 (2) to port 2 of drive channel 1 on the DS4700 Express.

4. Connect port 1 of drive channel 2 on the DS4700 Express to port 1B (1) on the right ESM in the third EXP810 (4).

5. Connect port 1A on the left ESM in the second EXP810 (3) to port 1B (1) on the left ESM in the fourth EXP810 (5).

6. Connect port 1A on the right ESM in the fourth EXP810 (5) to port 1B (1) on the right ESM in the second EXP810 (3).

7. Connect port 1B (1) on the left ESM in the second EXP810 (3) to port 1 of drive channel 1 on the DS4700 Express.

8. Connect port 2 of drive channel 2 on the DS4700 Express to port 1B (1) on the right ESM in the fourth EXP810 (5).

Figure 75 on page 93 shows the recommended cabling scheme for one DS4700 Express Storage Subsystem and a maximum of six EXP810 storage expansion enclosures behind both ports of a dual-ported drive channel.

ds470056 1

1

1

1

2 3

1

4 5

1

1

1

Figure 74. One DS4700 Express and four EXP810 storage expansion enclosures behind a pair of DS4700 drive ports

Perform the following steps to create the recommended cabling scheme shown in Figure 75:

1. Connect port 1A on the left ESM in the first EXP810 (2) to port 1B (1) on the left ESM in the third EXP810 (4).

2. Connect port 1A on the right ESM in the third EXP810 (4) to port 1B (1) on the right ESM in the first EXP810 (2).

3. Connect port 1B (1) on the left ESM in the first EXP810 (2) to port 2 of drive channel 1 on the DS4700 Express.

4. Connect port 1A on the left ESM in the third EXP810 (4) to port 1B (1) on the left ESM in the fifth EXP810 (6).

5. Connect port 1A on the right ESM in the fifth EXP810 (6) to port 1B (1) on the right ESM in the third EXP810 (4).

6. Connect port 1 of drive channel 2 on the DS4700 Express to port 1B (1) on the right ESM in the fifth EXP810 (6).

7. Connect port 1A on the left ESM in the second EXP810 (3) to port 1B (1) on the left ESM in the fourth EXP810 (5).

8. Connect port 1A on the right ESM in the fourth EXP810 (5) to port 1B on the right ESM in the second EXP810 (3).

9. Connect port 1B (1) on the left ESM in the second EXP810 (3) to port 1 of drive channel 1 on the DS4700 Express.

10. Connect port 1A on the left ESM in the fourth EXP810 (5) to port 1B (1) on the left ESM in the sixth EXP810 (7).

11. Connect port 1A on the right ESM in the sixth EXP810 (7) to port 1B on the right ESM in the fourth EXP810 (5).

ds470057

Figure 75. One DS4700 Express and a maximum of six EXP810 storage expansion enclosures behind a pair of DS4700 drive ports

12. Connect port 2 of drive channel 2 on the DS4700 Express to port 1B (1) on the right ESM in the sixth EXP810 (7).

One DS4700 Express and two or more storage expansion enclosures in a mixed configuration

When you cable the DS4700 Express Storage Subsystem to storage expansion enclosures that are in a mixed configuration, it is recommended that you cable the same type of enclosures together. 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 EXP100. Continue this cabling pattern until you encounter an EXP710 or EXP810, then cable from the IN port on the left ESM (ESM A) of the EXP100 to the IN port of the EXP710 or EXP810.

v If an EXP710 or EXP810 follows the initial EXP100, cable from the IN port on the left ESM (ESM A) of the EXP100 to the IN port of the EXP710 or EXP810. To cable to the next storage expansion enclosure in the chain, cable from the OUT port of the left ESM of the EXP710 or EXP810 to the IN port of the next storage expansion enclosure.

v Continue the left ESM (ESM A) cabling pattern by cabling from the OUT port to the IN port on subsequent storage expansion enclosures until you complete the chain.

Figure 76 on page 95 shows an acceptable EXP710, EXP810 and EXP100 intermix configuration in a DS4700 Express environment. The cabling is acceptable because it follows the cabling recommendations.

Table 27. Description of Figure 76

Number Description

1 DS4700 Express Storage Subsystem

2 EXP100

Figure 77 on page 96 shows an unacceptable EXP710, EXP810, and EXP100 intermix configuration in a DS4700 Express Storage Subsystem environment. The cabling is unacceptable because storage subsystem controller is cabled to the IN port on the left ESM of the first EXP100.

ESM B

Figure 76. Acceptable EXP710, EXP810 and EXP100 intermix configuration in a DS4700 Express Storage Subsystem environment

Table 28. Description of Figure 77

Number Description

1 DS4700 Express Storage Subsystem

2 EXP100

3 EXP810

4 IN port

5 OUT port

6 Port 1B

7 Port 1A

Figure 78 on page 97 shows cabling variations when intermixing EXP100, EXP710, and EXP810 storage expansion enclosures behind a DS4700 Express Storage

ESM B ESM A

ESM B ESM A

ESM B ESM A

ESM B ESM A

1

2 2

3

4 5 4 5

4 5 4 5

6 7

6 7

6 7

7 6 exp100810u

EXP100

EXP100

EXP810

EXP810

DS4000 Storage Subsystem

Figure 77. Unacceptable EXP710, EXP810 and EXP100 intermix configuration in a DS4700 Express Storage Subsystem environment

Subsystem.

Table 29. Description of Figure 78

Number Description

1 DS4700 Express Storage Subsystem

2 EXP100

3 EXP810

4 EXP710

In document Installation, User s and Maintenance Guide (Page 122-129)