IBM Netfinity FAStT500, Руководство по установке

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30 IBM Netfinity FAStT500 RAID Controller Enclosure Unit Installation Guide
Controller unit and drive enclosure cabling overview
The controller unit supports redundant drive loops. A redundant drive loop consists of one
or more drive enclosures connected to a controller using two sets of data cables. If one
data path fails, the controller uses the other data path to maintain I/O to the drive group.
Figure 18 shows a storage subsystem containing one controller enclosure unit and two
drive groups with four drive enclosures each. Each drive group uses redundant drive loops
to connect to the controller unit. Loop A and Loop B make up one redundant pair of drive
loops. Loop C and Loop D make up a second redundant pair.
Attention: To prevent loss of drive enclosure redundancy, cable the drive enclosures as
shown in the following figure.
Figure 18. Redundant drive loop cabling overview
Drive Loop D
Drive Loop A
Drive Loop B
Drive Loop C
Drive enclosure
Group 1
Drive enclosure
Group 2
Controller unit