Silicon Graphics InfiniteStorage TP9300 User Manual page 34

2: Storage Enclosures
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Figure 2-2 shows a rear view of both a controller enclosure and an expansion enclosure.
The rear of the enclosures contain the following components:
• RAID controllers: Controller enclosures contain two 2882 or 2822 RAID controllers.
• Environmental status modules (ESMs): Expansion enclosures have two ESM
modules in place of the RAID controllers.
• Fans: Two fans provide redundant cooling for the enclosure.
• Link rate/ enclosure ID switches: These switches indicate the connection speed and
set the ID number of the enclosure.
• Power supplies: Two power supplies provide redundant power for the enclosure.
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