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Lenovo S3200 Setup Manual: Fault-tolerant Cabling Between A Dual-controller Enclosure And Three 2u Drive Enclosures

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NOTE: Controller enclosures and optional/cascaded drive enclosures
Figure 13
on page 26 shows maximum supported enclosures for an S2200 array.
Figure 14
on page 27 shows maximum supported enclosures for an S3200 array.
0A
0B
1A
1B
2A
2B
3A
3B
Figure 13 Fault-tolerant cabling between a dual-controller enclosure and three 2U drive enclosures
The diagram at left (above) shows reverse cabling of a S3200/S2200 dual-controller enclosure and 2U
drive enclosures configured with dual-expansion modules. Controller module 0A is connected to expansion
module 1A, with a chain of connections cascading down (blue). Controller module 0B is connected to the
lower expansion module (3B), of the last expansion enclosure, with connections moving in the opposite
direction (green). Reverse cabling allows any expansion enclosure to fail—or be removed—while
maintaining access to other enclosures.
The diagram at right (above) shows the same storage components connected using straight-through
cabling. Using this method, if an expansion enclosure fails, the enclosures that follow the failed enclosure
in the chain are no longer accessible until the failed enclosure is repaired or replaced.
The 2U drive enclosures shown in
they can be a mixture of these models. Given that supported drive enclosure models use 6 Gb SAS link-rate
and SAS2.0 expanders, they can be ordered in desired sequence within the array, following the controller
enclosure.
Refer to these diagrams when cabling multiple compatible drive enclosures together with the S3200 or
S2200 controller enclosure.
IMPORTANT: Guidelines for stacking enclosures in the rack are provided in the rackmount bracket kit
installation sheet provided with your product.
26
Installing the enclosures
Controller A
Controller B
Out
In
In Out
In Out
In Out
In Out
In Out
Reverse cabling
Figure 13
Controller
enclosure
0
Drive
enclosure
1
Drive
enclosure
2
Drive
enclosure
3
can either be of the same type (all E1024s or all E1012s) or
Controller A
Controller B
Out
In
In Out
In
Out
In Out
In
Out
In Out
Straight-through cabling
0A
0B
1A
1B
2A
2B
3A
3B

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