Enclosure Management Module - Dell POWERVAULT MD1200 Technical Manualbook

5.5 Enclosure Management Module

Each EMM provides the following data path and enclosure management functions for the
enclosure:
• Monitoring and controlling enclosure environment elements such as temperature, fan,
power supplies, and enclosure LEDs.
• Controlling access to hard drives.
• Communicating enclosure attributes and states to the host server.
Item Indicator, Button, or
Connector
1 System Status Indicator
2 Debug Port
3 SAS Port (In)
4 In port link status
SAS Port (Out)
5
Out port link status
6
EMM Status LED
7
** Available in Q3 2010
Figure 7. Enclosure Management Module
Table 9. EMM Indicator Description
EMM INDICATOR AND FETAURE DESCRIPTION
Icon
Blinks blue when the system identification button is pushed. You
can identify a particular enclosure in a rack using the system
identification indicator.
For engineering use only.
IN Provides SAS connections for cabling the host or an up-chain
expansion enclosure (unified mode only).
Lights green when all the links to the port are connected.
Lights amber when one or more links to the port are not
connected.
The LED remains off if enclosure is not connected.
OUT Provides SAS connections for cabling to the next down chain
expansion enclosure in a daisy chain (unified mode only).
NOTE: The SAS port Out is disabled if the enclosure is running
in a split-mode configuration.
Lights green when all the links out of the port are connected.
Lights amber when one or more links out of the port are not
connected.
The LED remains off if enclosure is not connected.
Lights green when the EMM is functioning properly.
Lights amber when the enclosure does not boot or is not
properly configured.
Blinks green (On 250 ms* Off 250 ms) when a firmware
download is in progress.
Blinks green (On 1000 ms+ Off 1000 ms) when a peer auto-
Description
14