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Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
Temperature
The EMU monitors the internal temperature using enclosure mounted sensors.
When the enclosure internal temperature is 45°C (113°F) or more, the EMU turns O
the amber Enclosure Fault LED.
A power supply automatically shutdown if the internal power supply temperature
exceeds 85°C (180°F).
When the Compaq Insight Manager (CIM) is installed, it reports an alarm condition
when the ambient temperature reaches 50°C (122°F).
NOTE: The internal enclosure temperature and the ambient temperature are not the
same. The ambient temperature is the air temperature in an area where the enclosure is
installed. It is also referred to as the enclosure intake air temperature, or room
temperature. The enclosure internal temperature may be significantly higher.
Fault Bus
The active enclosure management services protocol is determined by the Compaq SCSI
adapter or the RAID controller attached to the enclosure. The fault bus is a protocol
supported by the EMU.
The Ultra2 SCSI bus controllers and adapters can control RAID subsystems, such as those
using StorageWorks Model 4200 LVD disk enclosures. Although the bus is a data
interchange facility it does not provide the features necessary to permit a controller to
monitor enclosure and storage device status. The fault bus provides this function. The
LVD enclosure family and the EMU support the fault bus as described in the following
sections.
The LVD enclosure implementation of the fault bus consists of the enclosure status
(SHELF_OK), the device swap (SWAP L), and two fault signals (FAULT_DATA and
FAULT_CLK) signals. These signals provide the controller with the capability to
effectively monitor specific RAID storage subsystem faults. These fault signals can, in
conjunction with the EMU, control the device status LEDs to provide visual indications of
error conditions.
Enclosure Status Signal
This fault bus signal (SHELF_OK) changes state to indicate a change in either an
enclosure power supply or cooling blower status.
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