Replacing the EMU

About the EMU

Each disk shelf enclosure features external system indicators (LEDs) that are controlled by the Environmental Monitoring Unit (EMU). The EMU is field replaceable by removing two thumbscrews and sliding it out the back of the enclosure. The EMU, however, is not hot swappable--the disk shelf must be powered down before replacement. The EMU communicates In-Band to the SCSI host system through its serial port, which is connected to the HDD Backplane Serial Port.

Location of the EMU

The EMU is plugged into the power backplane at the back of the enclosure.

Note
The external connection ports on the EMU are not used.

For detailed information

For details about replacing the EMU in a disk shelf, see the following topics:

Removing the EMU from the disk shelf
Installing an EMU in a disk shelf