4-2
Environmental Monitoring
Versatile Environmental Monitor (VEM)
The VEM is a Storage Array environmental monitoring device. It sits on the
backplane of the RAIDStation7 Ultra160 SCSI Storage Array. It gathers informa-
tion about the state of the devices in the Storage Array, such as power supplies,
disk drives, Advanced Cooling Modules and enclosure temperature. It communi-
cates with the host system using in-band reporting. This section will describe the
function of the VEM and how to interpret the LEDs and audible alarm fault indi-
cators. A diagram of the VEM, showing it’s main components can be seen in Fig-
ure 4-1.
Figure 4-1. Versatile Environmental Monitor
VEM Function
The function of the VEM is to collect data from the various “sensors” in the
enclosure. Monitor this data, and activate various visible and audible indicators to
denote failures and other conditions in the enclosure.
Temperature
Condition LED
Mute Alarm
Button
VEM Module on rear of shelf
Mute
Alarm
Temp
