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Figure 49. One DS4200 Express and four EXP420 storage expansion enclosures behind a
pair of DS4200 Express drive ports
Perform the following steps to create the recommended cabling scheme shown in
Figure 49:
1. Connect port 1A on the left ESM in the first EXP420 ( 2 ) to port 1B ( 1 ) on
the left ESM in the third EXP420 ( 4 ).
2. Connect port 1A on the right ESM in the third EXP420 ( 4 ) to port 1B ( 1 ) on
the right ESM in the first EXP420 ( 2 ).
3. Connect port 1B ( 1 ) on the left ESM in the first EXP420 ( 2 ) to port 2 of
drive channel 1 on the DS4200 Express.
4. Connect port 1 of drive channel 2 on the DS4200 Express to port 1B ( 1 ) on
the right ESM in the third EXP420 ( 4 ).
5. Connect port 1A on the left ESM in the second EXP420 ( 3 ) to port 1B ( 1 )
on the left ESM in the fourth EXP420 ( 5 ).
6. Connect port 1A on the right ESM in the fourth EXP420 ( 5 ) to port 1B ( 1 )
on the right ESM in the second EXP420 ( 3 ).
7. Connect port 1B ( 1 ) on the left ESM in the second EXP420 ( 3 ) to port 1 of
drive channel 1 on the DS4200 Express.
8. Connect port 2 of drive channel 2 on the DS4200 Express to port 1B ( 1 ) on
the right ESM in the fourth EXP420 ( 5 ).
Figure 50 on page 68 shows the recommended cabling scheme for one DS4200
Express Storage Subsystem and a maximum of six EXP420 storage expansion
enclosures behind both ports of a dual-ported drive channel.
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Chapter 3. Cabling the storage subsystem
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