SGI InfiniteStorage 4000 Series Guía de usuario Pagina 37

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Environmental Status Modules (ESMs)
007-4834-001 19
Figure 2-5 InfiniteStorage 4000 RAID Controller Enclosure Front and Rear Components
Environmental Status Modules (ESMs)
The expansion enclosures contain environmental status modules (ESMs) instead of
RAID controllers (see Figure 2-6). Each environmental status module contains an
environmental services monitor board and two slots for SFPs (small form-factor
pluggables). The environmental services monitor board is the interface between the
controller enclosure and the expansion enclosure, and it monitors expansion enclosure
status. If there are internal problems in the expansion enclosure, the environmental
services monitor board lights the appropriate fault LED. For more information about this
LED, see “Checking the Indicator Lights” on page 32.
Front View
1. Drive Canister
2. Alarm Mute Button
3. Link Rate Switch
Back View
4. Battery Canister
5. Controller A (Inverted)
6. Power-Fan Canister
7. Power Connector
8. Power Switch
9. Host Channels
(two or four)
10. Controller B
11. Ethernet Ports
12. Serial Port
13. Dual-ported Drive
Channel
14. Tray ID
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