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3. The DS4200 Express currently supports a maximum of 112 drives in six
4. When connecting six storage expansion enclosures to a DS4200 Express, use
5. Connect a maximum of four EXP420s per DS4200 Express controller drive port.
One DS4200 Express and one EXP420 storage expansion
enclosure
Figure 46 shows the recommended cabling scheme for one DS4200 Express
Storage Subsystem and one EXP420 storage expansion enclosure.
Figure 46. One DS4200 Express and one EXP420 storage expansion enclosure —
Recommended cabling
Perform the following steps to create the recommended cabling scheme shown in
Figure 46:
1. Connect either port 2 or port 1 of the dual-ported drive channel 1 in controller A
2. Connect either port 1 or port 2 of the dual-ported drive channel 2 in controller B
One DS4200 Express and two EXP420 storage expansion
enclosures
Figure 47 on page 65 shows the cabling scheme for one DS4200 Express Storage
Subsystem and two EXP420 storage expansion enclosures behind both ports of a
dual-ported drive channel.
64
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
16-drive storage expansion enclosures per drive channel in each controller,
including the 16 E-DDMs in the DS4200 Express internal drive slots. One drive
channel from each of controllers A and B must be connected to the same set of
storage expansion enclosures to provide drive channel redundancy. Do not
connect a combination of more than six storage expansion enclosures to the
two ports of a single drive channel.
all ports in both drive channels. See Figure 44 on page 62 for the recommended
cabling topology.
1
on the DS4200 Express to port 1B ( 1 ) on the left ESM of the EXP420.
on the DS4200 Express to port 1B ( 1 ) on the right ESM of the EXP420.
1
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