Cabling; Connecting The Drive Loop Cables - Silicon Graphics TP9400 RAID Owner's Manual

8.

Connecting the Drive Loop Cables

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Chapter 8

Cabling

This chapter describes the cabling between the controller enclosure and the front-end
host, the drive enclosure and the back-end drive side, Ethernet, serial port, and power
connections.
The TP9400 is designed to support redundant drive loops. A redundant drive loop
consists of one or more drive enclosures connected to the controller enclosure using two
sets of data cables. If one data path fails, the controller uses the other data path to
maintain access to the drive group.
Use this procedure to cable a group of TP9400 drive enclosures into a redundant drive
loop. If the drive loop contains only one drive enclosure, skip this procedure and go to
"Connecting Drive Cables to the Controller Enclosure" on page 125.
Caution: Electrostatic discharge can damage sensitive components. Use appropriate
antistatic precautions before handling any components.
To complete this procedure, you will need two optic interface cables.
1. Connect the first two drive enclosures to drive Loop A (Figure 8-1).
Starting with the first drive enclosure, connect an interface cable from the In
(sometimes shown as an Up arrow) connector on the left environmental status
module to the Out (sometimes shown as a Down arrow) connector on the left
environmental status module in the second (next) drive enclosure.
Note: "In" and "Out" (or Up and Down arrows) do not refer to data flow direction.
These are meant to indicate how enclosures are chained.
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